Trunk (thorax, abdomen, back)

Iliopsoas Fascia

Fascia iliopsoatica

Origin

Envelops the iliopsoas muscle (iliacus and psoas major together), attached to the iliac crest and the pelvic brim

Insertion

Extends distally under the inguinal ligament into the thigh and fuses there with the fascia lata

Function

Envelops the iliopsoas muscle, delimits the compartment within which a psoas abscess or hemorrhage can spread, and forms part of the posterior wall of the muscular lacuna

Innervation

No independent motor innervation (connective tissue structure, not contractile tissue)

Movement & chain

Encloses the iliopsoas muscle and forms the iliopectineal arch separating muscular and vascular lacunae.

Palpation

Covers the iliopsoas in the posterior abdominal wall and iliac fossa; palpable as deep resistance medial to the ASIS.

Clinical

Guides retroperitoneal fluid and psoas abscesses (e.g. from tuberculous spondylitis) down beneath the inguinal ligament into the femoral triangle.

Segmental innervation

L1–L3 (lumbar plexus)

In clinical practice

Wound management post-laparotomy/chest drain and abdominal wall monitoring; support incision site during coughing to prevent wound dehiscence.

Region in the model

Trunk (thorax, abdomen, back)