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PSOAS MAJOR
Dr M Idris Siddiqui
The long, thick, fusiform psoas
major lies lateral to the lumbar
vertebrae
The psoas fascia
• The psoas fascia covering the psoas major (psoas
sheath) is attached medially to the lumbar
vertebrae a...
Four parts
a) Thoracic part( lies in posterior mediastinum)lies bhind
medial arcuate ligament. It may be related to pleura...
Relations of abdominal Part
Anteriorly related to kidney, renal vessels( at L1), ureters,
gonadal vessels, genitofemoral n...
Relations of pelvic part
Anteriorly: External iliac artery, gonadal
vessels, genjitofemoral nerve
Laterally: Femoral nerve...
Relations of femoral part
• Lies inferior to inguinal
ligament, in front of hip joint
(separated by a bursa), iliacus
is l...
Relations of lumbar plexus to psoas
• The genitofemoral nerve emerges through its
anterior surface.
• The obturator nerve ...
Psoas Fascia and Tuberculosis
• The psoas fascia covers the anterior surface of
the psoas muscle and can influence the
dir...
Iliopsoas test
• The iliopsoas has extensive and clinically important
relations to the kidneys, ureters, cecum, appendix,
...
Psoas major
Psoas major
Psoas major
Psoas major
Psoas major
Psoas major
Psoas major
Psoas major
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abdominal/lower limb muscle

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Psoas major

  1. 1. PSOAS MAJOR Dr M Idris Siddiqui The long, thick, fusiform psoas major lies lateral to the lumbar vertebrae
  2. 2. The psoas fascia • The psoas fascia covering the psoas major (psoas sheath) is attached medially to the lumbar vertebrae and pelvic brim . • The psoas fascia (sheath) is thickened superiorly to form the medial arcuate ligament. • The psoas fascia fuses laterally with the quadratus lumborum and thoracolumbar fascias. • Inferior to the iliac crest, the psoas fascia is continuous with the part of the iliac fascia covering the iliacus. The psoas fascia also blends with the fascia covering the quadratus lumborum.
  3. 3. Four parts a) Thoracic part( lies in posterior mediastinum)lies bhind medial arcuate ligament. It may be related to pleura. b) Abdominal part: • Upper part forms part of posterior abdominal Wall. • Intermediate part crosses sacroiliac joint & runs along true pelvic brim. • Lower part passes behind inguinal ligament. c)Pelvic part d)Femoral part lies in front of hip joint from which it is separated by a big bursa.
  4. 4. Relations of abdominal Part Anteriorly related to kidney, renal vessels( at L1), ureters, gonadal vessels, genitofemoral nerve Medially related to sympathetic trunk, lumbar vessels,(lie between tendinious arches & vertebral bodies, IVC on right side & aorta on left side. Laterally emerge iliohypogastric, ilioinguinal, lateral femoral cutaneous & femoral Nerves. It is overlapped by quadratus lumborum Posteriorly related to 1) transverse processes of lumbar vertebrae 2) medial edge of quadratus lumborum, 3) lumbar plexus lies in substance of muscle, 4) external vertebral venous plexus ( lies in front of tranverse processes)
  5. 5. Relations of pelvic part Anteriorly: External iliac artery, gonadal vessels, genjitofemoral nerve Laterally: Femoral nerve • Left psoas is crossed by terminal part of descending colon • Right psoas is crossed by terminal part of ilium
  6. 6. Relations of femoral part • Lies inferior to inguinal ligament, in front of hip joint (separated by a bursa), iliacus is lateral to it, pectius is medial, • Femoral artery lies in front of muscle
  7. 7. Relations of lumbar plexus to psoas • The genitofemoral nerve emerges through its anterior surface. • The obturator nerve & emerge at its • The lumbosacral trunk medial border • The iliohypogastric nerve emerge • The ilioinguinal nerve at its • The lateral cutaneous nerve of thigh lateral • The femoral nerve border
  8. 8. Psoas Fascia and Tuberculosis • The psoas fascia covers the anterior surface of the psoas muscle and can influence the direction taken by a tuberculous abscess. • Tuberculous disease of the thoracolumbar region of the vertebral column results in the destruction of the vertebral bodies, with possible extension of pus laterally under the psoas fascia. From there, the pus tracks downward, following the course of the psoas muscle, and appears as a swelling in the upper part of the thigh below the inguinal ligament. • It may be mistaken for a femoral hernia.
  9. 9. Iliopsoas test • The iliopsoas has extensive and clinically important relations to the kidneys, ureters, cecum, appendix, sigmoid colon, pancreas, lumbar lymph nodes, and nerves of the posterior abdominal wall. When any of these structures is diseased, movement of the iliopsoas usually causes pain. • The person is asked to lie on the unaffected side and to extend the thigh on the affected side against the resistance of the examiner's hand. The elicitation of pain with this maneuver is a positive psoas sign. • An acutely inflamed appendix, for example, will produce a positive right psoas sign. Because the psoas lies along the vertebral column and the iliacus crosses the sacroiliac joint, disease of the intervertebral and sacroiliac joints may cause spasm of the iliopsoas, a protective reflex.
  • HanisHafizal

    Aug. 17, 2021
  • AmanAkare

    May. 8, 2021

abdominal/lower limb muscle

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