Abdomen

Question 1

External oblique

Answer 1

Origin: External surface of lower 8 ribs
Insertion: aponeurosis into linea alba
Innervation: Ant. rami of T7-T12

Question 2

Function of 3 sheet like abdo muscles?

Answer 2

1. Compresses the abdomen and increases intra-abdominal pressure to aid expiration and evacuation of faeces, urine and parturition, heavy lifting.
2. Supports viscera - guards the intestines
3. Flex and rotate the trunk

Question 3

Inguinal ligament: formation and location?

Answer 3

Formation: Rolling inwards of the lower aponeurotic border of the external oblique.
Location: It extends from the anterior superior iliac spine (ASIS) to the pubic tubercle

Question 4

Internal oblique

Answer 4

Origin: Thoracolumbar fascia, iliac crest between origin of external and transversus, lateral 2/3 of inguinal ligament
Insertion: Inf. border of lower 3/4 ribs, aponeurosis end in linea alba, conjoint tendon inserts into pubic crest and pectineal line
Innervation: Ant. rami of T7-T12