Human Anatomy: Muscle Groups

Human Anatomy

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Muscle Function & Other Pertinent Medical Information
ORIGIN: Lumbar fascia, anterior two thirds of iliac crest and lateral two thirds of inguinal ligament
INSERTION: Costal margin, aponeurosis of rectus sheath (anterior and posterior ), conjoint tendon to pubic crest and pectineal line
ACTION: Supports abdominal wall, assists forced respiration, assists raising intra-abdominal pressure and, with muscles of other side , abducts and rotates trunk. Conjoint tendon supports posterior wall of inguinal canal
NERVE: Anterior primary rami (T7-12) (conjoint tendon ilioinguinal nerve (L1))

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