Understanding and Managing Quadratus lumborum Myofascial Syndrome with Osteopathy - OsteoMag (2024)

Activation of quadratus lumborum myofascial syndrome refers to the worsening of symptoms associated with this particular syndrome.

Table of Contents

Introduction

Quadratus lumborum syndrome, a debilitating medical condition, is caused by painful trigger points in the muscles located in the lower back on either side of the spine.These trigger points are responsible for local pain, muscle tension and can even cause pain that radiates to other parts of the body.Understanding the mechanisms and factors underlying this condition is crucial for implementing appropriate treatment approaches.

The quadratus lumborum muscles, essential for stability and mobility of the lumbar region, can be subject to various triggers.Muscle tensions, often linked to inadequate postures, repetitive movements or excessive loads, are frequent contributors to the appearance of this syndrome.These tensions can create painful trigger points, thereby amplifying the discomfort felt by affected individuals.

Understanding and Managing Quadratus lumborum Myofascial Syndrome with Osteopathy - OsteoMag (1)

Muscle spasms are also associated with quadratus lumborum syndrome.These involuntary muscle contractions can make pain worse by compressing surrounding structures, creating a vicious cycle of pain and spasms.Understanding and treating these spasms is essential to relieving muscle tension and improving the quality of life of those affected.

Injuries, whether acute or chronic, can trigger this syndrome.Physical trauma such as falls or accidents can lead to muscle damage, contributing to the formation of painful trigger points.Additionally, underlying medical conditions such as arthritis or spinal problems may be predisposing factors, making treatment of quadratus lumborum syndrome more complex.

Treatment of this condition often relies on a multifactorial approach.Physiotherapy, particularly targeted muscle strengthening exercises and stretching, can play a crucial role in reducing muscle tension and improving flexibility.Relaxation techniques, including meditation and deep breathing, can help ease muscle spasms, providing long-term relief.

Consideration of psychosocial factors is also essential in the management of quadratus lumborum syndrome.Stress and anxiety can exacerbate symptoms, highlighting the importance of stress management strategies integrated into the overall treatment plan.In some cases, specific medical interventions, such as trigger point injections or the use of analgesic medications, may be recommended to relieve acute pain.

In summary, quadratus lumborum syndrome represents a medical challenge requiring a holistic approach.Understanding the underlying mechanisms and implementing appropriate treatment strategies are essential to improve the quality of life of individuals affected by this painful condition.

Definition of quadratus lumborum myofascial syndrome

Characteristics of quadratus lumborum myofascial syndrome:

  1. Trigger points:These points, also called muscle knots, are hypersensitive areas of the quadratus lumborum muscle.They are often palpable and can be painful when pressed.
  2. Referred pain:Trigger points in the quadratus lumborum muscle can cause referred pain, which is pain that is felt distant from the actual site of the trigger points.This pain can spread to the buttocks, hips, groin, or even the upper thigh.
  3. Stiffness and restriction of movement:People with quadratus lumborum syndrome may experience stiffness and restriction of movement in the lower back region.This can affect spinal flexibility and lead to altered posture.
  4. Pain Worsened by Activity:Symptoms of quadratus lumborum myofascial syndrome may be exacerbated by certain activities, especially those that involve trunk rotation, lateral bending, or prolonged sitting.

Impacts of quadratus lumborum myofascial syndrome:

  1. Discomfort and pain:The presence of trigger points in the quadratus lumborum muscle can lead to constant discomfort and localized pain, as well as referred pain in other parts of the body.
  2. Impaired muscle function:Tension and trigger points can affect the normal function of the quadratus lumborum muscle, leading to impaired lumbar stability and potentially contributing to muscle imbalances.
  3. Impact on quality of life:Movement limitations and pain associated with the syndrome can have a significant impact on daily quality of life, limiting participation in certain activities and affecting general well-being.

Treatment for quadratus lumborum myofascial syndrome may include techniques such as stretching, myofascial release, physical therapy, massage, and in some cases anti-inflammatory medications or injections.Managing posture, movement habits, and stressors also helps manage this condition.It is recommended to consult a healthcare professional for an accurate diagnosis and appropriate treatment plan based on the severity of symptoms.

Anatomy

The muscles of the quadratus lumborum

  • Iliocostal fiber:This thin superficial layer, comprising muscle fibers
    1. Iliocostals (from the iliac crest to the ribs)
    2. Iliothoracic (from the iliac crest to the lateral area of ​​the vertebral body of T12)
  • Lumbocostal Fiber: The middle layer includes lumbocostal muscle fibers (from the transverse processes of the lumbar vertebrae to the 12th rib).
  • Iliolumbar fibers:The posterior layer consists of lateral iliocostal fibers and medially iliolumbar fibers (from the iliac crest, connecting to the transverse processes of the lumbar vertebrae).
Understanding and Managing Quadratus lumborum Myofascial Syndrome with Osteopathy - OsteoMag (2)

When both sides of the muscle contract simultaneously, it causes the lumbar spine to extend.If one side contracts, it pulls the rib cage down to facilitate lateral flexion (lateral flexion) or raises one side of the pelvis in what is called hip hike.

Function of the quadratus lumborum

The quadratus lumborum muscle, also called quadratus lumborum, is a thick, quadrilateral muscle located in the lumbar region of the spine.It extends from the transverse processes of the lumbar vertebrae and the iliac crest to the twelfth rib.The quadratus lumborum muscle plays an important role in the movement of the trunk and spine, and it is also involved in stabilizing the lumbar region.Here are some of its main functions:

  1. Lateral trunk tilt:When the quadratus lumborum muscle contracts on one side, it laterally tilts the trunk on the same side.This is especially important during movements such as lateral spinal flexion.
  2. Spinal Extension:The muscle can also participate in spinal extension.When both quadratus lumborum muscles contract simultaneously, they help straighten the spine after forward bending.
  3. Stabilization of the lumbar spine:The quadratus lumborum muscle plays a key role in stabilizing the lumbar region.It is activated to maintain the vertical position of the spine, including resisting unwanted lateral flexion and maintaining postural balance.
  4. Helps in breathing:The quadratus lumborum muscle is also involved in the process of breathing.It participates in the elevation of the lower ribs during inspiration, thus contributing to the expansion of the thoracic cavity.

It is important to note that the quadratus lumborum works in coordination with other muscles of the lumbar region, trunk and pelvis to enable smooth, stable and coordinated movements of the body.Imbalances in these muscles can contribute to problems with posture, mobility or pain in the lower back region.Targeted strengthening and stretching exercises may be recommended to maintain optimal health and function of the quadratus lumborum and surrounding structures.

Common causes of quadratus lumborum myofascial syndrome activation

Activation of quadratus lumborum myofascial syndrome can be caused by a variety of factors, including:

  1. Muscle tension and trauma:Excessive muscle tension, trauma, injury or overuse can trigger the activation of trigger points in the quadratus lumborum muscle.
  2. Bad postures:Adopting awkward positions or maintaining poor posture for long periods of time can contribute to irritation of the quadratus lumborum muscles.
  3. Repetitive movements:Activities that involve repetitive movements, especially if performed incorrectly, can cause myofascial syndrome to activate.
  4. Emotional Stress:Emotional stress and tension can contribute to the activation of trigger points in muscles, including the quadratus lumborum.
  5. Sedentary lifestyle:A sedentary lifestyle and lack of physical activity can contribute to the development of muscle tension and promote the activation of trigger points.
  6. Underlying medical conditions:Certain medical conditions, such as postural disorders, spinal problems, or anatomical abnormalities, may increase susceptibility to activation of myofascial syndrome.
  7. Dehydration:Insufficient hydration can contribute to the formation of muscle knots and increase the risk of activation.

It is important to note that these factors can interact in complex ways, and often multiple elements contribute simultaneously to the activation of quadratus lumborum myofascial syndrome.

Understanding and Managing Quadratus lumborum Myofascial Syndrome with Osteopathy - OsteoMag (3)

Symptoms of quadratus lumborum myofascial syndrome

Quadratus lumborum syndrome can manifest itself with various symptoms, including:

  1. Local pain:Pain is usually felt in the lower back region on the affected side.It can be constant or appear during specific movements.
  2. Painful trigger points:The quadratus lumborum muscle can develop trigger points, tender, painful areas that respond to pressure.
  3. Radiating pain:Pain can radiate to the hips, buttocks, groin, or even down the leg, sometimes creating confusion with other disorders.
  4. Muscle stiffness:A feeling of stiffness or muscle tension may be present in the affected area.
  5. Decreased mobility:Due to pain and stiffness, mobility in the lumbar region may be reduced.
  6. Pain with prolonged sitting or standing:Pain may worsen with sitting or standing for long periods of time.
  7. Improves with rest:Pain may improve with rest, but it may return with specific activities.
  8. Postural asymmetry:Changes in posture may be observed, sometimes with a tilt of the trunk to the affected side.

It is important to note that symptoms may vary from person to person, and other medical conditions may present with similar symptoms.

Differential diagnosis

The differential diagnosis of quadratus lumborum syndrome involves the exclusion of other conditions that may present with similar symptoms.Here are some disorders to consider in the differential diagnosis:

  1. Lumbar disc herniation:A herniated disc can cause pain in the lumbar region with radiation to the hips and lower limbs.
  2. Lumbar Osteoarthritis:Osteoarthritis of the spine can cause pain and stiffness in the lumbar region.
  3. Kidney problems:Kidney problems, such as kidney stones or infections, can cause lower back pain.
  4. Sacroiliac joint (SAI) pathologies:Disorders affecting the ASI, such as sacroiliitis, can present with similar symptoms.
  5. Gynecological conditions:In women, gynecological problems, such as ovarian cysts, can cause pain in the pelvic region that radiates to the lower back.
  6. Digestive pathologies:Digestive problems, such as renal colic, can also cause pain in the lumbar region.
  7. Piriformis syndrome:Piriformis syndrome can cause pain in the buttocks and lower back region.
  8. General muscle pain:Widespread muscle pain, due to causes such as fibromyalgia, can affect the lower back region.
  9. Sciatica:Compression of the sciatic nerve can cause lower back pain radiating down the leg.
  10. Spondylolisthesis:The slipping of one vertebra over another can cause similar symptoms.

Prevention

Prevention of painful quadratus lumborum syndrome involves measures to reduce muscle tension and promote overall back health.Here are some recommendations to prevent this syndrome:

  1. Correct Posture:Maintain good posture when sitting and standing.Avoid sitting for long periods without moving.Use lumbar support if necessary.
  2. Strengthening Exercises:Strengthen the core muscles, with emphasis on the abdominal and back muscles.Targeted exercises can help stabilize the spine.
  3. Regular Stretching:Incorporate stretching into your daily routine, focusing on the muscles of the lower back, hips and thighs.
  4. Stress Management:Stress can contribute to muscle tension.Practice stress management techniques such as meditation, deep breathing and yoga.
  5. Ergonomics at Work:Adjust your work environment to promote good posture.Use an ergonomic chair and make sure your desk is at the right height.
  6. Warm-up Before Exercise:Before exercising, perform a proper warm-up to prepare the muscles for physical activity.
  7. Changing Positions:If you spend a lot of time sitting, take breaks to stand up, stretch, and change positions.
  8. Adequate Hydration:Make sure you stay hydrated, as dehydration can contribute to muscle stiffness.
  9. Maintaining a Healthy Weight:Maintain a healthy body weight to reduce pressure on the spine.

Osteopathic approach

  1. Overall Assessment:The osteopath will begin with a comprehensive assessment of posture, joint mobility and soft tissue palpation to understand the overall dynamics of the patient’s body.
  2. Identification of Areas of Tension:By focusing on the lumbar region, the osteopath will identify areas of tension and imbalance, with particular emphasis on the quadratus lumborum.
  3. Myofascial Techniques:Specific myofascial techniques will be applied to release tension in the quadratus lumborum and surrounding tissues.This may involve gentle stretching, deep pressure, or myofascial release techniques.
  4. Correction of Postural Imbalances:Osteopaths will also work on correcting postural imbalances that can contribute to quadratus lumborum myofascial syndrome.This may include advice on daily posture and specific exercises.
  5. Exercises and Tips:Patients can receive specific exercise recommendations to strengthen and stretch the muscles of the lumbar region, promoting stability and mobility.
  6. Holistic Approach:The osteopathic approach is often holistic, taking into account the patient’s overall health.Advice on lifestyle, diet and stress management can also be integrated.

Correction of quadratus lumborum myofascial syndrome

  1. Muscle stretches:Stretching exercises targeting the quadratus lumborum can help release tension.Stretches such as lateral spinal flexion and trunk rotation may be beneficial.
  2. Muscle strengthening:Strengthening surrounding muscles, including the abdominals and lower back muscles, can help stabilize the lower back and reduce tension in the quadratus lumborum.
  3. Therapeutic massage:Massages can help release trigger points and improve blood circulation to the affected area.
  4. Myofascial Therapy:Manual therapy techniques aimed at releasing adhesions and tension in the myofascial tissue may be beneficial.This may include myofascial release and trigger point release techniques.
  5. Ultrasound therapy or electrotherapy:These modalities can be used to relieve pain and promote healing of muscle tissue.
  6. Stress management:Stress can contribute to muscle tension.Stress management techniques, such as meditation, deep breathing and relaxation, can be incorporated to help prevent episodes of tension.
  7. Postural correction:Poor posture can contribute to myofascial syndrome.Paying close attention to workplace ergonomics and daily posture can be beneficial.
  8. Nonsteroidal anti-inflammatory drugs (NSAIDs):If inflammation occurs, anti-inflammatory medications may be recommended to relieve pain and discomfort.However, this should be discussed with a healthcare professional.

Exercises and Stretches

Stretching

Seated quadratus lumbar stretch

  • Sit with your legs extended in front of you.
  • Bend your right leg and place your foot against the inside of your left thigh.
  • Turn your upper body toward the bent leg, trying to reach the foot with the opposite hand.
  • Hold the position for 20-30 seconds and repeat on the other side.

Kneeling stretch

  • On your knees, place your hands in front of you.
  • Slowly lower your upper body toward the floor while stretching your arms.
  • Hold the position for 20-30 seconds while breathing deeply.

Standing Lateral Stretch

  • Stand with your feet shoulder-width apart.
  • Raise your right arm above your head and gently tilt your torso to the left.
  • Stretch the right side of the body, keeping your right arm straight and your feet firmly planted on the ground.
  • Hold the position for 20-30 seconds while breathing deeply.
  • Repeat on the other side, raising your left arm.
Understanding and Managing Quadratus lumborum Myofascial Syndrome with Osteopathy - OsteoMag (4)

Stretching the quadratus lumborum while performing a forward bend with the help of a desk

  • Find a desk or stable surface:Make sure the desk is at an appropriate height, about hip height when you’re standing.
  • Position yourself correctly:Stand with your feet shoulder-width apart, facing the desk.
  • Bend your knees slightly:This will help release tension on your lower back.
  • Tilt your upper body forward:Start bending your body forward from the waist, keeping your back straight.
  • Support your hands on the desk:Use the desk to support your weight.You can place your hands on the desk while keeping your arms straight.
  • Stretch the quadratus lumborum side:To specifically target the quadratus lumborum, tilt your body slightly to one side, making sure you feel a stretch on the side opposite the flexion.
  • Hold the position:Stay in this position for 15 to 30 seconds, breathing deeply.
  • Return to starting position:Slowly rise to an upright position using the desk support.
  • Repeat on the other side:Repeat the process by tilting your body to the opposite side to stretch the other side of the quadratus lumborum.
Understanding and Managing Quadratus lumborum Myofascial Syndrome with Osteopathy - OsteoMag (5)

Strengthening Exercises

Side plank

  • Lie on your side with your elbow directly under your shoulder.
  • Lift hips off the floor, forming a straight line from head to toe.
  • Hold the position for 20-30 seconds and repeat on the other side.

Pelvic elevation

  • Lie on your back with your knees bent and your feet flat on the floor.
  • Slowly lift your hips toward the ceiling, contracting your quadratus lumborum muscles.
  • Hold the position at the top for a few seconds, then lower back down.

Important Tips

  • Do these exercises in a controlled manner, without forcing.
  • Warm up before you start and stretch after exercising.
  • If you experience pain or discomfort, stop immediately and consult a healthcare professional.

Frequently Asked Questions

  1. What is quadratus lumborum myofascial syndrome (MLS)?
    • MLS is a muscular condition characterized by trigger points in the quadratus lumborum, which can cause pain and tension.
  2. What are the common symptoms of MLS?
    • Symptoms include localized pain in the lower back, tender trigger points, and sometimes, radiating pain.
  3. What are the causes of MLS?
    • Causes may include repetitive movements, muscle tension, stress, or trauma, contributing to the development of trigger points.
  4. How is MLS diagnosed?
    • Diagnosis is based on clinical examination, the patient’s medical history and identification of trigger points by a healthcare professional.
  5. Which professionals can treat SML?
    • Specialist osteopaths, physiotherapists and massage therapists can help treat MLS.
  6. What techniques are used to relieve MLS?
    • Treatments may include massages, stretching, osteopathic techniques, and specific exercises.
  7. Can exercises help prevent MLS?
    • Yes, regular strengthening and stretching exercises can help prevent MLS by maintaining flexibility and muscle strength.
  8. Is rest recommended in cases of SML?
    • A temporary break from activities exacerbating symptoms may be recommended, but a gradual return to activity is often encouraged.

References

  1. Grzonkowska M, Baumgart M, Badura M, Dombek M, Wiśniewski M, Paruszewska-Achtel M, Szpinda M. Quantitative anatomy of the growingquadratuslumborumin the human foetus.Surg Radiol Anat.2018 Jan;40(1):91-98.[PMC free article] [PubMed]2.
  2. Phillips S, Mercer S, Bogduk N. Anatomy and biomechanics ofquadratuslumborum.Proc Inst Mech Eng H.2008 Feb;222(2):151-9.[PubMed]3.
  3. Chal J, Pourquié O. Making muscle: skeletal myogenesisin vivoandin vitro.Development.2017 Jun 15;144(12):2104-2122.[PubMed]4.
  4. Hernández-Hernández JM, García-González EG, Brun CE, Rudnicki MA. The myogenic regulatory factors, determinants of muscle development, cell identity and regeneration.Semin Cell Dev Biol.2017 Dec;72:10-18.[PMC free article] [PubMed]5.
  5. Beveridge TS, Power A, Johnson M, Power NE, Allman BL. The lumbar arteries and veins: Quantification of variable anatomical positioning with application to retroperitoneal surgery.Clin Anat.2015 Jul;28(5):649-60.[PubMed]6.
  6. Singh T, Andi K. Iliolumbar artery: a useful pedicle for the iliac crest free flap in maxillofacial reconstruction.Br J Oral Maxillofac Surg.2017 Apr;55(3):270-273.[PubMed]7.
  7. Beveridge TS, Allman BL, Johnson M, Power A, Sheinfeld J, Power NE. Retroperitoneal Lymph Node Dissection: Anatomical and Technical Considerations from a Cadaveric Study.J Urol.2016 Dec;196(6):1764-1771.[PMC free article] [PubMed]8.
  8. Kim JH, Won HS, Chung IH, Kim IB. The enigmatic subcostal muscle: Anatomical study with application to spine and chest pain syndromes and avoidance of confusion on imaging.Clin Anat.2015 Nov;28(8):1017-21.[PubMed]9.
  9. Ueshima H, Otake H, Lin JA. Ultrasound-GuidedQuadratusLumborumBlock: An Updated Review of Anatomy and Techniques.Biomed Res Int.2017;2017:2752876.[PMC free article] [PubMed]10.
  10. Tulgar S, Ermis MN, Ozer Z. Combination of lumbar erector spinae plane block and transmuscularquadratuslumborumblock for surgical anaesthesia in hemiarthroplasty for femoral neck fracture.Indian J Anaesth.2018 Oct;62(10):802-805.[PMC free article] [PubMed]

Understanding and Managing Quadratus lumborum Myofascial Syndrome with Osteopathy - OsteoMag (2024)

FAQs

What muscles does the QL compensate for? ›

Both QL muscles work together to extend our spine. Independently, the QL muscle can elevate your hip to do a “hip hike” or it can help you bend your trunk to the same side. This muscle can also become activated to help you compensate when other core stabilizing muscles become weak such as your abdominal muscles.

What is quadratus lumborum myofascial pain syndrome? ›

Lumbosacral back pain syndrome :

In some cases, there can be radiating symptoms in the lower extremity. Quadratus lumborum syndrome falls into this category of low back pain. Myofascial pain syndrome (MPS) of the spinal stabilizer muscles is one of the most frequent causes of chronic low back pain.

What does quadratus lumborum pain feel like? ›

Symptoms of Quadratus Lumborum Muscle Pain

Tightness and discomfort in the low back. A deep, aching pain above the pelvis. Pain that gets worse with movement. You may notice it more when you walk or stand, or even roll over in bed.

How do you release myofascial muscles in quadratus lumborum? ›

Using a foam roller can be a great way to release tight QL muscles in the lower back. The right foam roller can target and treat these muscles to relive symptoms. Foam rolling can help improve circulation, provide myofascial release, reduce trigger points and allow for better mobility helping you move freely.

How to tell if your QL is tight? ›

Symptoms of a quadratus lumborum strain will cause the low back to feel like there is a sharp or tugging sensation occurring in the low back with movement or even breathing.

How do you reverse myofascial pain syndrome? ›

How is myofascial pain syndrome treated?
  1. Cooling spray. ...
  2. Massage therapy.
  3. Physical therapy, which may include stretching and strengthening exercises. ...
  4. Trigger point shots (injections). ...
  5. Dry needling. ...
  6. Cognitive behavioral therapy (CBT). ...
  7. Transcutaneous electrical nerve stimulation (TENS).
  8. Ultrasound.

What mimics myofascial pain syndrome? ›

The muscle pain present in both fibromyalgia (FM) and myofascial pain syndrome (MPS) is a reason why these two conditions are sometimes mistaken for one another or erroneously lumped together as one condition.

How do you treat quadratus lumborum syndrome? ›

Depending on the severity of the pain, the following treatments may be helpful:
  1. Yoga. Share on Pinterest Yoga stretches may help with quadratus lumborum pain. ...
  2. Medications. Drugs such as muscle relaxants and pain medication may help decrease quadratus lumborum pain. ...
  3. Trigger point injections. ...
  4. Massage therapy. ...
  5. Heat or ice.
Jan 3, 2018

What position should I sleep in with QL muscle? ›

With an active QL strain, stretched positions tend to be aggravating in nature. Due to this, sleeping in positions that promote a neutral spine may be recommended. For those who sleep on their back, placing a bolster or pillow below the knees may help to keep the spine in neutral.

How to massage quadratus lumborum? ›

Place two or three fingers of your uphill hand on the belly of the QL, using gentle pressure. Place your downhill hand on your client's hip. Maintain moderate pressure on the QL as you slowly rock your client's hips forward and back. The hand on the QL is still; the working hand is the rocking hand.

What nerve runs through the quadratus lumborum? ›

Innervation of the QL is via the twelfth thoracic nerve and the spinal rami of the lumbar spinal nerves.

How to sit with QL pain? ›

Sitting
  1. Sit as little as possible, and only for short periods of time (10 to 15 minutes).
  2. Sit with a back support (such as a rolled-up towel) at the curve of your back.
  3. Keep your hips and knees at a right angle. (Use a foot rest or stool if necessary.)

Where are the trigger points for quadratus lumborum? ›

It has two main trigger points, superficial and deep. The superficial trigger points are present near the hip and rib cage. Feel around the area for sensitive spots. It shows a related pain pattern over the lower buttock and inner thigh.

How do you unlock quadratus lumborum? ›

  1. QL Stretch. • Stand with your back against a wall. • Tuck your bottom under and flatten your back against the wall (so there is no gap) • Reach up to stretch your side and then over to the side. • In this image we are stretching the left QL. • Hold for 30 seconds repeat x 2 x 3 x a day.
  2. Side Plank.

What is the QL responsible for? ›

Generally, the QL muscle is located medially to the aponeurosis of the transverse abdominal muscle. The anatomy texts describe the quadratus lumborum muscle as an extensor of the lumbar spine, a stabilizer of the lumbar area, capable of tilting laterally and capable of acting as an inspiratory accessory muscle.

What is the antagonist muscle to the quadratus lumborum? ›

The quadratus lumborum and psoas muscles are antagonistic yet have an interesting codependent dynamic. Sink into the thoracolumbar aponeurosis and erector spinae group and continue to slide anteriorly until you palpate the convergence of where the QL meets the psoas.

What is the synergist of QL? ›

Synergists: The QL is the prime mover of lateral flexion, with the internal obliques , external obliques , ipsilateral erector spinae , and to a lesser degree the ipsilateral latissimus dorsi acting synergistically.

What muscles are near the quadratus lumborum? ›

Anterior to the quadratus lumborum are the colon, the kidney, the psoas major muscle, (if present) the psoas minor muscle, and the diaphragm; between the fascia and the muscle are the twelfth thoracic, ilioinguinal, and iliohypogastric nerves.

References

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