The Rectum Flashcards
what is the rectum continuous with
the sigmoid colon
where does the rectum terminate
in the anal canal
what are the two flexures that mark the course of the rectum
sacral and anorectal flexure
what do the transverse folds of the internal rectum wall form
three lateral flexures
why does the ampulla relax
to accumulate and store faeces
what covers the superior third of the rectum
peritoneum
is there any peritoneum associated with the middle third of the rectum
yes , but only anteriorly
is there any peritoneum associated with the lower third of the rectum
no
describe the blood supply of the rectum
three main arteries
- superior rectal
- middle rectal
- inferior rectal
what is the superior rectal artery a continuation of
the inferior mesenteric artery
what is the middle rectal artery a branch of
the internal iliac artery
what is the inferior rectal artery a branch of
the indernal pudenal artery
describe the venous drainage of the rectum
there are three systems - superior middle and inferior. superior empties into the portal venous system and the middle and inferior empty into the systemic venous system
describe the innervation of the rectum
sympathetic nerves supply to the rectum is from the lumbar splanchnic nerves and superior and inferior hypogastric plexuses
where do the parasympathetic fibres that supply the rectum come from
the pelvic splanchnic nerves and inferior hypogastric plexuses
