Muscles of the Abdomen

Question 1

list all abdominal wall muscles

Answer 1

external oblique
internal oblique
transversus abdominis
rectus abdominis
pyramidalis

Question 2

origin and insertion of external oblique

Answer 2

O - outer surface of lower 8 ribs

I - lateral of iliac crest

Question 3

innervation of external oblique

Answer 3

anterior rami of lower 6 thoracic spinal nerves

Question 4

action of external oblique

Answer 4

compress abdominal content, flex trunk

Question 5

origin and insertion of internal oblique

Answer 5

O - thoracolumbar fascia, iliac crest, lateral 2/3 of inguinal ligament
I - inferior border of lower 3-4 ribs, pubic crest and pectineal line

Question 6

innervation of internal oblique

Answer 6

anterior rami of lower 6 thoracic spinal nerves

Question 7

action of internal oblique

Answer 7

compress abdominal contents

flex trunk

Question 8

origin and insertion of transversus abdominis

Answer 8

O - thoracolumbar fascia - medial of iliac crest, lateral 1/3 of inguinal ligament, costal cartilage of of ribs 7 to 12
I - aponeurosis end in linea aspera, pubic crest, pectineal line

Question 9

innervation of transversus abdominis

Answer 9

anterior rami of lower 6 thoracic spinal nerves

Question 10

origin and insertion of rectus abdominis

Answer 10

O - pubic crest, pubic tubercle and pubic symphysis

I - costal cartilage of ribs 5 to 7, xiphoid process

Question 11

innervation of rectus abdominis

Answer 11

anterior rami of lower 6 thoracic spinal nerves

Question 12

action of transversus of abdominis

Answer 12

compress abdominal contents

Question 13

action of rectus of rectus abdominis

Answer 13

compress abdominal content - flex vertebral column

Question 14

origin and insertion of pyramidalis

Answer 14

O - front of pubis and pubic symphysis

I - linea alba

Question 15

innervation of pyramidalis

Answer 15

anterior rami of lower 6 thoracic spinal nerves

Question 16

action of pyramidalis

Answer 16

tense linea alba