Abdominal Muscles

Transversus abdominis, internal oblique, external oblique, rectus abdominis

What are the 4 abdominal muscles from deep to superficial?

Linea alba

"White line", gristly, tough and translucent. Attached from sternum to pubic bone

Transversus abdominis

Deepest abdominal muscle, this muscle compresses the abdomen (waist) or fixates the waist. Horizontal

Linea alba

What is the insertion of the transversus abdominis?

Ribs 6-12, T.L.F., Iliac crest

What are the 3 origins of the transversus abdominis?

Abdominal nerve

What is the innervation of all of the abdominal muscles?

Thoracolumbar fascia

Covers the deep muscles of the back and trunk. Critical to overall organization and integrity of the region.

Internal oblique

Muscle that has lateral rotation of the torso, and firms abs. down lateral

Iliac crest, T.L.F. (a little)

What are the origins of the internal oblique?

Linea alba (superior to umbilicus)

What is the insertion of the internal oblique?

External oblique

Muscle that rotates abdomen medially, and fixates the abdomen? Up lateral

Ribs 6-12, T.L.F. (a little)

What are the origins of the external oblique?

Linea alba (below umbilicus)

What is the insertion of the external oblique?

Inguinal canal

Passageway in the groin area through which the testes travel as they descend from the abdomen to the scrotum. This is formed by the external oblique

Rectus abdominis

This muscle flexes trunk at the waist (such as a sit up/bow), and compresses to allow the release of waste

Symphysis pubis

What is the origin of the rectus abdominis?

Sternum, Tendinous insertions

What are the insertions of the rectus abdominis?

Tendinous insertions

6 total, abdominal muscles can hold onto these. Causes the six pack