Abdominal Wall Muscle Table

Question 1

Rectus Abdominis origin

Answer 1

Pubic Crest

Question 2

Rectus Abdominis insertion

Answer 2

Xiphoid Process and Costal Margin

Question 3

External Abdominal Oblique Origin

Answer 3

Lower 8 ribs

Question 4

External Abdominal Oblique insertion

Answer 4

Rectus Sheath (linea alba)

Question 5

Internal Abdominal Oblique origin

Answer 5

Lateral 2/3 of inguinal ligament, Iliac Crest, and Thoracolumbar Fascia

Question 6

Internal Abdominal Oblique insertion

Answer 6

Rectus Sheath (linea alba)

Question 7

Transversus Abdominis origin

Answer 7

Lower Ribs
Lateral 1/3 of Inguinal Ligament
Iliac Crest
Thoracolumbar Fascia

Question 8

Internal Abdominal Oblique insertion

Answer 8

Rectus Sheath (linea alba)

Question 9

What muscles share linea alba as their common insertion?

Answer 9

External and internal abdominal obliques and transversus abdominis

Question 10

What is the common innervation of all of these muscles?

Answer 10

Lower 6 intercostal nn.
Subcostal nn.
Iliohypogastric n.
Ilioinguinal n.

Question 11

What are the common actions of all the abdominal muscles?

Answer 11

Trunk movement
Breathing
Defecation
Support