Muscles of Anterior Abdominal Wall

Question 1

Rectus Abdominus (origin)

Answer 1

pubic symphysis and along pubic crest

Question 2

Rectus Abdominus (insertion)

Answer 2

xiphoid process, costal cartilages 5-7

Question 3

Rectus Abdominus (action)

Answer 3

flexes trunk, compresses abdominal viscera

Question 4

Rectus Abdominus (innervation)

Answer 4

Ventral rami of 6 inferior thoracic nerves

Question 5

Internal oblique (origin)

Answer 5

Thoracolumbar fascia, anterior 2/3 of iliac crest, lateral half of inguinal ligament

Question 6

Internal oblique (insertion)

Answer 6

inferior borders of ribs 10-12, linea alba and the pubis

Question 7

Internal oblique (action)

Answer 7

compresses and supports abdominal viscera, flexes and rotates trunk

Question 8

Internal oblique (innervation)

Answer 8

ventral rami of 6 inferior thoracic and first lumbar nerves

Question 9

External oblique (origin)

Answer 9

External surfaces of ribs 5-12

Question 10

External oblique (insertion)

Answer 10

Linea alba, pubic tubercle, anterior half of iliac crest

Question 11

External oblique (action)

Answer 11

compresses and supports abdominal viscera, flexes and rotates trunk

Question 12

External oblique (innervation)

Answer 12

Ventral rami of 6 inferior thoracic nerves

Question 13

Transversus Abdominis (origin)

Answer 13

Thoracolumbar fascia, anterior iliac crest, lateral part of inguinal ligament, tips of lower 6 ribs

Question 14

Transversus Abdominis (insertion)

Answer 14

aponeurosis into linea alba

Question 15

Transversus Abdominis (action)

Answer 15

compression of the abdominal cavity

Question 16

Transversus Abdominis (innervation)

Answer 16

Lower intercostal nerves, L1