defecation Flashcards
pelvic floor muscles involved in continence
levator ani trio
what are the main muscles of levator ani in men/woemn
pubourethralis/puborectalis
pubovaginalis/puborectalis
what si this muscle? where does it attach
puborectalis - U shaped muscle aattached to pubic symphysis, loops round rectuam, vagina and urethra
nerve roots aand what does it do: pudendal nerve
S2,3,4 keeps 3 P’s off the floor (penis poo and pee)
which nerve is a branch of teh pudendal nerve and innervates bulbospongiosus, ischiocavernosis and levator ani muscles
perineal
The levator ani muscles also receive innervation directly from the anterior ramus of the
S4 root
which nerve provides motor supply to theexternal anal sphincter and what is it a branch of
inferior rectal nerve - branch of pudendal
internal anal sphincter is autonomic so what is its innervation
L5 symp - hypogastrix plexus and S2-4 para - pelvic plexus
***what is not present in Hirschprung’s disease
RAIR
what does the anorectal angle do
creates the “flap valve” so that when intra-abdominal pressure increases, the valve closes so poo doesn’t get pushed into the rectum
what are the lateral angulations in the sigmoid colon called
valves of Houston
what is the ability of teh rectum to maintain poo called
reservoir continence
what is RAIR
rectoanal inhibitory reflex
what does RAIR do
allows anal mucosal sampling to distinguish between gas/solid/liquid contents of rectum
how often does RAIR occur
7/h
what is this
rectocele
A - IAS
B-EAS
