External Abdominal Oblique

Question 1

Origin

Answer 1

By fleshy digitations from outer surfaces and lower borders of lower 8 ribs, interdigitating with Serratus anterior and Lattismus dorsi

Question 2

Fibers direction

Answer 2

Downwards, forwards, and medial

Question 3

Insertion

Answer 3

1. By fleshy fibers into anterior 1/2 of iliac crest outer lip
2. By aponeurosis into xiphoid process, linea alba, symphysis pubis, and pubic crest
3. Its lower free border is folded upon itself forming Inguinal ligament which is attached to pubic tubercle medial and ASIS lateral

Question 4

3 free borders

Answer 4

1. Upper horizontal
2. Lower free border
3. Posterior vertical free border

Question 5

Lower free border

Answer 5

Form Inguinal ligament

Question 6

Posterior vertical free border

Answer 6

1. Form anterior boundary of inferior lumbar triangle
2. Below a line between ASIS and umbilicus, the muscle becomes aponeurotic

Question 7

Superficial (external) Inguinal ring

Answer 7

An opening in muscle aponeurosis from which aponeurosis is prolonged forming external spermatic fascia