Internal Oblique
Origin: Lumbar fascia, anterior aspect of iliac crest & inguinal ligament.
Insertion: Superiorly on 9th, 10th, 11th & 12th costal cartilages & along the linea alba.
Innervation: Six lower thoracic & first lumbar nerves.
Actions: Abducts trunk, rotates trunk, supports abdominal wall, assists in forced respiration, aids in raising intra-abdominal pressure & supports posterior wall of inguinal canal.
External Oblique:
Origin: External surfaces of ribs 5-12.
Insertion: Broad flat aponeurosis, terminating at the linea alba, anterior iliac spine, pubic tubercle & external lip of the anterior half of the iliac crest.
Innervation: Ventral primary rami of T7 to T12.
Actions: Abducts trunk, rotates trunk, supports abdominal wall, assists in forced expiration & aids in raising intra-abdominal pressure.
Internal & External Oblique: Fibers run perpendicular to one another.
Dr Donald A Ozello DC of Championship Chiropractic in Las Vegas, NV
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Two Minutes of Anatomy: Internal & External Obliques
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