Rectus Abdominis

Question 1

Origin

Answer 1

Pubic crest and symphysis pubis front

Question 2

Fibers direction

Answer 2

Longitudinally on each side of anterior abdominal wall middle line

Question 3

Insertion

Answer 3

Along horizontal line into:
1. 5th, 6th, and 7th costal cartilages outer surfaces
2. Xiphoid process outer surface

Question 4

Lateral border

Answer 4

Convex and indicated on skin by shallow groove (linea semilunaris)

Question 5

Enclosed in

Answer 5

A fibrous sheath (rectus sheath)

Question 6

Divided into segments by

Answer 6

3 or 4 tendinous intersections (white collagenous fibrous tissue) which indicate that muscle is formed by fusion of number of myotomes

Question 7

Intersections site

Answer 7

Seen only on anterior surface only and adherent only to rectus sheath anterior wall
1. One at xiphoid process level
2. One midway between xiphoid process and umbilicus
3. One at umbilicus level
4. Not always present (below umbilicus)