External Oblique Muscle
Internal Oblique Muscle
Attachments of Internal Oblique Muscle: Origin & Insertion
Origin: (proximal attachments)
a. Anterior iliac crest, lateral half of inguinal ligament, and thoracolumbar fascia.
Insertion: (distal attachments)
a. Costal cartilages of ribs 8-12; abdominal aponeurosis to linea alba.
Actions of the abdomen:
a. Flexes vertebral column (draws thorax downward).
b. Rotates vertebral column (torso).
c. Laterally flexes vertebral column (compresses abdomen).
Learn this topic even more efficiently with this trunk wall muscle anatomy reference chart.
Innervation of Internal Oblique Muscle:
- 8-12 intercostal, iliohyogastric, and ilioinguinal nerves.