Transversus Abdominis

Question 1

Origin

Answer 1

1. Thoracolumbar fascia
2. Anterior 2/3 of iliac crest inner lip
3. Lateral 1/3 of Inguinal ligament upper concave surface
4. Lower 6 costal cartilages inner surfaces interdigitating with costal slips of diaphragm origin

Question 2

Fibers direction

Answer 2

Transverse except lower fibers

Question 3

Insertion

Answer 3

1. By aponeurosis into xiphoid process, linea alba, and symphysis pubis
2. Lowermost fibers join conjoint tendon to be inserted into pubic crest and pectineal line

Question 4

Aponeurosis

Answer 4

Splits horizontally at arcuate line level

Question 5

Aponeurosis upper part

Answer 5

Extends behind rectus abdominis sharing in formation of rectus sheath posterior wall

Question 6

Aponeurosis lower part

Answer 6

Extends anterior to rectus uniting with internal oblique aponeurosis to form conjoint tendon

Question 7

Lined by

Answer 7

Fascia transversalis