Name.

Position.

Origin.

Insertion.

Action.

Nerve Supply.

Obliquus externus abdominis.

Side and front of abdomen.

Eight lower ribs by fleshy digitations, lumbar fascia.

Linea alba, outer lip iliac crest, ensiform cartillage, pubis.

Compresses viscera. Flexes thorax. Assists expiration.

Intercostal. Ilio-hypogastric. Ilio-inguinal.

Obliquus internus abdominis.

Beneath external oblique.

Outer half Poupart's ligament, lumbar fascia, middle lip iliac crest.

cartilages four lower ribs, ensiform cartilage, linea alba.

Compresses viscera. Flexes thorax. Assists in expiration.

Intercostal. Ilio-hypogastric. Ilio-inguinal.

Transversalis abdominis.

Beneath internal oblique.

Outer third Poupart's ligament, inner lip iliac crest, cartilages six lower ribs, lumbar vertebras, lumbar fascia.

Linea alba, pubis, pectineal line.

Compresses viscera. Flexes thorax. Assists in expiration.

Intercostal. Ilio-hypogastric. Ilio-inguinal.

Rectus

abdominis.

The whole length of front of abdomen.

Pubic crest.

Ensiform and fifth to seventh costal cartilages.

Compresses viscera. Flexes thorax. Assists in expiration.

Intercostal. Ilio-hypogastric. Ilio-inguinal.

Pyramidalis.

Lower part of abdomen in front of rectus.

Pubic crest.

Linea alba.

Makes tense linea alba.

Ilio-hypogastric.

Quadratus lumborum

In the lumbar region.

Ilio - lumbar ligament and portion of crest of ilium.

Lower border of last rib, transverse processes of upper four lumbar vertebrae.

Keeps spine straight. Aids in contracting diaphragm. Flexes trunk.

Branches of lower dorsal and upper lumbar.

Psoas magnus.

In the pelvis on the side of the lumbar region of the spine.

Bodies and transverse process; s of last dorsal and all lumbar vertebrae.

Lesser trochanter.

Flexes thigh on trunk or trunk on thigh.

Third lumbar.

Psoas parvus.

In front of psoas magnus.

Bodies of last dorsal and first lumbar vertebrae

Ilio-pectineal line and eminence, and fascia iliaca.

Makes tense the iliac fascia.

First lumbar.