Abdominal Muscles (Trail Guide)

Question 1

Rectus Abdominis

Answer 1

A: Flex and vertebral column; Tilt pelvis posteriorly

O: Pubic Crest, Pubic symphysis

I: Cartilage of 5-7 ribs and xiphoid process

N: T5, T6, T7-11, T12, ventral rami

Question 2

External Oblique

Answer 2

A: (Unilaterally)
Laterally Flex vertebral column to the same side
Rotate vertebral column to the opposite side
(Bilaterally)
Flex the vertebral column; Compress abdominal contents

O: External surfaces of 5-12 ribs

I: Anterior part of the iliac crest, rectus sheath to linea alba

N: T5-T12

Question 3

Internal Oblique

Answer 3

A: (Unilaterally)
Laterally flex vertebral column to the same side
Rotate the vertebral column to the same side
(Bilaterally)
Flex the vertebral column; Compress abdominal contents

O: Lateral inguinal ligament, iliac crest, thoracolumbar fascia

I: Internal surface of lower three ribs, rectus sheath to linea alba

N: T7-T12, iliohypogastric and ilioinguinal, ventral rami

Question 4

Transverse Abdominis

Answer 4

A: Compress abdominal contents

O: Lateral inguinal ligament, iliac crest, thoracolumbar fascia, and internal surface of lower six ribs

I: Rectus sheath to linea alba

N: T7-T12, L1, iliohypogastric and ilioinguinal, ventral divisions