ANATOMY – POSTERIOR ABDOMINAL WALL – ILIOPSOAS

ILIOPSOAS

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Radiopaedia.org – The iliopsoas muscle is found within the iliopsoas compartment and is an important muscle in locomotion and upright posture.

origin: L5-S2 fusion of psoas major and iliacus muscles
insertion: lesser trochanter of the femur
nerve supply: femoral nerve; lumbar plexus
blood supply: iliolumbar artery; medial femoral circumflex artery
action: flexor of the hip and trunk; lateral flexor of the trunk

PSOAS MAJOR

– Last revised by Assoc Prof Craig Hacking◉◈ on 25 Aug 2021
– The psoas major muscle (usually shortened to just the psoas muscle) is one of the muscles of the posterior abdominal wall and lies not in the retroperitoneum but posterior to it, in the iliopsoas compartment.

origin: vertebral bodies, intervertebral discs and transverse processes of T12 to L5
insertion: lesser trochanter of the femur
innervation: branches of the L1-L3 roots of the lumbar plexus
arterial supply: lumbar arteries, iliolumbar artery, deep circumflex iliac artery, external iliac artery, femoral artery
action: lateral flexion of the trunk; stabilizer and flexor of the hip; The antagonist is the gluteus maximus.

ILIACUS

– Last revised by Assoc Prof Craig Hacking◉◈ on 25 Aug 2021
– The iliacus muscle is one of the muscles of the posterior abdominal wall and contributes to the iliopsoas muscle and tendon.

origin: superior 2/3s of the iliac fossa, anterior sacroiliac ligaments and anterior sacral ala
insertion: into the psoas major tendon to form iliopsoas tendon which inserts on the lesser trochanter of the femur
innervation: femoral nerve
action: stabilizer and flexor of the hip

VIDEOS

Muscle in Motion – Iliopsoas .
Abelson – DC – Palpation of the Iliopsoas Complex .
Noted Anatomist – Iliopsoas .
Anatomy Zone – Muscles of the Posterior Abdominal Wall .
Webster – Muscles of the Posterior Abdominal Wall .