CH 37 OINAs Abdominal Muscles

O: Ribs 5-12 outer surface

Origin of externus obliquus abdominis

O: Illium- iliac crest, intermediate lip, anterior 2/3

Inguinal ligament- lateral 2/3

Thoracolumbar fascia (lumbodorsal fascia)

Origin of internus obliquus abdominis

O: ribs 7-12 - inner surface

Illium- iliac crest, inner lip, anterior ¾

Inguinal ligament- lateral 1/3

Thoracolumbar fascia (lumbodorsal fascia)

Origin of transversus abdominis

O: pubis- pubic crest, symphysis pubis

Origin of rectus abdominis

I: Illium- iliac crest, outer lip, anterior ½

Inguinal ligament- entire length

Linea alba

Insertion of external obliquus abdominis

I: Ribs 9-12 borders

Linea alba

Conjoint tendon

Insertion of internus obliquus abdominis

I: Linea alba

Conjoint tendon

Insertion of Transversus abdominis

I: Xiphoid process

Ribs 5-7

Insertion of rectus abdominis

Nerve innervation for externus obliquus abdominis

Thoracoabdominal nerves (IC T7-11)

Subcostal nerve (T12)

Iliohypogastric nerve

Nerve innervation of internus obliquus abdominis and transversus abdominis

Thoracoabdominal nerves (IC T7-11)

Subcostal nerve (T12)

Iliohypogastric nerve

Illioinguinal nerve

Nerve innervation for rectus abdominis

Thoracolumbar nerves (T7-11)

Subcostal nerve (T12)