OIAs Muscles of the abdominal wall (7)

Question 1

Linea Alba

Answer 1

-band of connective tissue which extends from xiphoid process of the sternum to
the symphysis pubis. Serves as an attachment for some abdominal muscles

Question 2

External Oblique

Answer 2

i. O: lower ribs
ii. I: iliac crest
iii. A: tenses abdominal wall, compresses abdomen

Question 3

Internal Oblique: beneath external oblique

Answer 3

i. O: iliac crest
ii. I: lower ribs & linea alba
iii. A: same as external oblique

Question 4

Rectus Abdominis

Answer 4

i. O: coxal bone & symphysis pubis
ii. I: ribs & xiphoid process
iii. A: compresses abdomen, flexes vertebral column; does not laterally flex vertebral
column with unilateral contraction as the previous two muscles do

Question 5

Transverse abdominis: runs horizontally under top 2 layers

Answer 5

i. O: lower ribs and coxal bone
ii. I: pubic bone & linea alba
iii. A: compresses adbomen