Anterolateral abdominal wall

Question 1

Functions of AL wall

Answer 1

Support/protect abdominal viscera
alter intra-abdominal pressure
Move trunk
Help maintain posture

Question 2

List the muscles of the AL wall

Answer 2

External oblique
internal oblique
Transverse abdominis
Rectus abdominis

Question 3

How do the muscle fibers travel for each muscle in the AL wall

Answer 3

External oblique - Down and medial
internal oblique - up and medial
Transverse abdominis - medially
Rectus abdominis - vertically in midline

Question 4

What are the tendon structures in the rectus abdominis

Answer 4

tendinous intersections

Question 5

What is the fascia associated with the EO, IO, TA muscles of the AL wall

Answer 5

Aponeuroses

Question 6

What structures do the aponeuroses of the EO, IO, TA form

Answer 6

meet at the midline to form the linea alba (“white line”)

Contribute to rectus sheath (anterior and posterior component [behind Ra])

Question 7

what structure(s) are associated with the inguinal ligament

Answer 7

aponeurosis of external oblique:
- inferior margin creates an under-curving fibrous band

Question 8

where does the inguinal ligament travel

Answer 8

anterior superior iliac spine to the pubic bone

Question 9

What structures make up the rectus sheath

Answer 9

aponeuroses of EO, IO and TA

Question 10

what does the rectus sheath surround

Answer 10

encases the rectus abdominus (like a pillow case)

Question 11

Purpose/location of arcuate line

Answer 11

location: separates EO,IO, TA from RA
Purpose: organizes superior and inferior portion of rectus sheath

Question 12

Organization of aponeuroses (EO, IO and TA) SUPERIOR to arcuate line

Answer 12

1.5 pass anterior, relative to RA (1 EO, 0.5 IO)

1.5 pass posterior, relative to RA
(1 TA, 0.5 IO)

Question 13

Organization of aponeuroses (EO, IO and TA) INFERIOR to arcuate line

Answer 13

aponeuroses of EO, IO and TA pass anterior, relative to RA