Principle Muscles of Anterolateral Abdominal Wall

Question 1

External oblique - O

Answer 1

external surfaces of 5th-12th ribs

Question 2

External oblique - I

Answer 2

linea alba, pubic tubercle, and anterior half of iliac crest

Question 3

External oblique - N

Answer 3

anterior rami of T7-T11

Question 4

External oblique - A

Answer 4

compresses and supports abdominal viscera

trunk flexion and rotation

Question 5

Internal oblique - O

Answer 5

thoracolumbar fascia, anterior 2/3 of iliac crest

Question 6

Internal oblique - I

Answer 6

inferior borders of 10th-12th ribs, linea alba, and pubis via conjoint tendon

Question 7

Internal oblique - N

Answer 7

anterior rami of T7-T11

Question 8

Internal oblique - A

Answer 8

compresses and supports abdominal viscera

trunk flexion and rotation

Question 9

Transverse abdominis - O

Answer 9

internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, and connective tissue deep to inguinal ligament

Question 10

Transverse abdominis - I

Answer 10

linea alba with aponeurosis of internal oblique, of pubic crest, and pubis via conjoint tendon

Question 11

Transverse abdominis - N

Answer 11

anterior rami of T7-T11

Question 12

Transverse abdominis - A

Answer 12

compresses and supports abdominal viscera

contracts when laughing/clearing throat

Question 13

Rectus abdominis - O

Answer 13

pubic symphysis and pubic crest

Question 14

Rectus abdominis - I

Answer 14

xiphoid process and 5th-7th costal cartilages

Question 15

Rectus abdominis - N

Answer 15

anterior rami of T7-T12 spinal nerves

Question 16

Rectus abdominis - A

Answer 16

trunk flexion (lumbar)
compresses abdominal viscera
stabilizes and controls tilt of pelvis (antilordosis)

Question 17

Linea alba

Answer 17

white line running vertically through rectus abdominis

Question 18

Fiber orientation - External obliques

Answer 18

diagonally superior to inferior, posterior to anterior \\\ (hands in front pockets)

Question 19

Fiber orientation - Internal obliques

Answer 19

diagonally inferior to superior, posterior to anterior /////