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Abdominal Bilateral Nerves Contraction External Oblique Structure Muscles

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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