Muscles of the Abdomen

Question 1

External abdominal oblique innervation

Answer 1

spinal nn. (ventral rami) T7-12

Question 2

External abdominal oblique attachments

Answer 2

from lower 8 ribs to iliac crest & rectus sheath, TL fascia attachment as well?

Question 3

External abdominal oblique actions

Answer 3

flexion & rotation of the trunk, & compression of the abdominal cavity

Question 4

Internal oblique innervation

Answer 4

lower thoracic & L1 ventral rami T7-12, L1, iliohypogastric and ilioinguinal, ventral rami

Question 5

internal oblique attachments

Answer 5

from thoracolumbar fascia to inguinal ligament, iliac crest & rectus sheath

Question 6

internal oblique actions

Answer 6

flexion & rotation of the trunk, & compression of the abdominal cavity

Question 7

Transversus abdominis inn.

Answer 7

lower thoracic T7-12, ventral divisions

Question 8

Transversus abdominis attachments

Answer 8

from lower six costal cartilages & thoracolumbar fascia to inguinal ligament, iliac crest & rectus sheath

Question 9

Transversus abdominis action

Answer 9

compress and support the abdominal viscera

Question 10

Rectus abdominis inn.

Answer 10

lower thoracic ventral rami T5-12

Question 11

Rectus abdominis action

Answer 11

flexion of trunk & compression of abdominal cavity

Question 12

Quadratus Lumborum innervation

Answer 12

Lumbar plexus ventral rami T12-L3

Question 13

Quadratus lumborum attachments

Answer 13

from 12th rib & transverse processes of L1-4 to iliolumbar ligament & iliac crest

Question 14

Quadratus lumborum actions

Answer 14

extension & lateral flexion of the trunk, and fixes 12th rib during respiration

Question 15

What muscles make up the posterior abdominal wall?

Answer 15

quadratus lumborum, psoas major and minor, iliacus, diaphragm, transversus abdominis

Question 16

diaphragm innervation

Answer 16

phrenic nerve C3-5

Question 17

diaphragm attachments

Answer 17

from xiphoid process, inner surface of the lower ribs & costal cartilages, medial & lateral arcuate ligaments & lumbar vertebrae via the crura to the central tendon

Question 18

diaphragm actions

Answer 18

inspiration (negative thoracic pressure by inferior displacement)

Question 19

Cremaster muscle innervation

Answer 19

genitofemoral nerve

Question 20

Cremaster muscle attachment

Answer 20

from the medial edge of the internal oblique to spermatic cord

Question 21

Cremaster muscle actions

Answer 21

elevation of testis