| Front | External abdominal oblique |
|---|---|
| Back | Structure: bilateral muscles attached to lower ribs and costal cartilages, iliac crest, and inguinal ligament. Inserts medially into linea alba via an aponeurosis and rectus sheath Fiber direction: anteroinferiorly (hands-in-pockets) Innervation: ventral rami of abdominal wall nerves (T6-L1), which include a) intercostal nerves (T6-11) b) subcostal nerve (T12) c) ilioinguinal nerve (L1) Function: 1. bilateral contraction for flexion (ex: sit-ups) 2. unilateral contraction for lateral bending and rotation 3. Compression of abdominal cavity to increase pressure (for vomitting, defecating, coughing, giving birth, etc.) |
Tags: muscles
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