Gluteus Maximus - Attachments, Actions & Innervation
External Oblique Muscle
Attachments of External Oblique Muscle: Origin & Insertion
Origin: (proximal attachments)
a. External surfaces of ribs 5-12.
Insertion: (distal attachments)
a. Anterior iliac crest and abdominal aponeurosis to linea alba.
Actions of the abdomen:
a. Flexes vertebral column (draws thorax downward).
a. Rotates vertebral column (torso).
a. Laterally flexes vertebral column (compresses abdomen).
Innervation of External Oblique Muscle:
- 8-12 intercostal, iliohyogastric, and ilioinguinal nerves.