pubic anatomy

Question 1

Main muscle of daefacation

Answer 1

Between pubis and rectum

Question 2

Arterial supply of the rectum

Answer 2

Superior rectal : inferior mesenteric artery

Middle rectal: internal illiac

Inferior rectal: Internal pudendal

Question 3

Lymphatic drainage of the rectum and anal canal

Answer 3

Anal canal: superficial inguinal

Rectum: external iliac and sacral

Sup. rectum: sacral

Sacral goes to para-aortic

Question 4

Nervous signalling in daefacation

Answer 4

Stretch receptors activate parasympathetics (S2-4)

Lumbar sympathetics are inhibited (L1,2) involuntary sphincter relaxes.

Somatic nerves inhibited via pudendal nerve, voluntary sphincter relaxes.

Parasympathetic efferents are activated, peristalsis and mass movement are activated