Abdomen and Low Back Anatomy

Iliopsoas Anatomy: Origins, Insertions, Actions, Innervations

Illacus – Origin: Iliac fossa, anterior inferior iliac spine Insertion: Lessor trochanter Actions: Flexes the hip, laterally rotates hip
Psoas Major – Origin: Tranverse processes T12 – L5 Insertion: Lessor trochanter Actions: Laterally rotates hip, flexes hip, flexes spine
Psoas Minor – Origin: Bodies of T12, L1 and intervening intervertebral disc Insertion: Iliopubic eminence via iliopectineal arch

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Internal and External Obliques Anatomy: Origin, Insertion, Action and Innervation

Internal Oblique:
Origins: iliac crest, lumbar fascia, inguinal ligament
Insertion: 7-12 ribs, linea alba, pubic crest
Actions: flexes and rotates the vertebral column, assists with expiration, compresses abdominal contents
External Oblique:
Origins: linea alba, 5-12th rib
Insertions: iliac crest, pubic crest, linea alba
Actions: flexes and rotates the vertebral column, assists with expiration, compresses abdominal contents

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