clinical anatomy of faecal continence Flashcards
faecal continence can be affected by
medications
natural age related degeneration of nerve innervation of muscle
consistency
pelvic cavity, where is it, what does it contain
lies within the boney pelvis
continuous with abdominal cavity
lies between pelvic inlet and pelvic floor
contains pelvic organs and supporting tissues
rectum located within
sigmoid colon becomes rectum anterior at what level?
what is this called?
S3 ‘recto-sigmoid junction’
where does the rectal ampulla lie
immediately superior to the levator ani muscle
what happens in the ampulla
faeces is help my muscles and sphincotrs until time for excretion
what lie in the superior rectum
rectouterine/rectovesical pouch
what make up the pelvic floor
levator ani muscle
+ another?
three components of the levator ani muscle
iliococcygeus
pubococcygeus
puborectails
what does the levator ani muscle do?
perovides continual support for the pelvic organs
reflexively contracts further during increase in intra-abdominal pressure
muscle must relax to allow defecation to occur
what nerve supply’s levator ani muscle
‘nerve to levator ani’ and pudendal (S2,3,4)
s 2,3,4 keeps the gut off the floor
what are the anal spinctors
1 interior sphincter - smooth muscle
1 external sphincter - skeletal muscle
what contracts stimulates/inhibits the internal anal sphinctor
contracts stimulated by sympathetic
contraction inhibits by parasympathetic
nerve supply to anal canal:
sympathetic fibres from..
T12-L2
nerve supply to anal canal:
somatic motor from…
pudendal nerve S2-S4
nerve to levator ani S3,S4
pudendal nerve
branches of sacral plexus
s2,3,4 anterior rami
supplies external anal sphinctor
exist pelvis via greater sciatic foramen
