sturge_weber
Forum Guru
Topics: 77
Posts: 1,034
|
can someone explain the defecation reflex
what happens if the external sphincter gone, what if the pelvic nerve, and what happens when the pudendal nerve gone, and what happens when the internal anal sphincter gone
very perplexing ....
plzzzz reply asap
|
| reet
Forum Guru
Topics: 152
Posts: 1,397
|
defecation reflex occurs when rectum distented--
1, internal sphincter RELAXES
2, EXternal sphincter CONTRACTS
3, and when urge to defecate is percieved
PELVIC NERVE gives parasympathetic to int sphincter(SMOOTH MUSCLE) - helps in RELAXATION --if DAMAGED nerve-- NO ANAL SPHINCTER RELAXATION OCCURS.AND URGE TO DEFECATE ALSO DOESNT OCCUR( cuz sensory affernt from rectum to spinal cord)
pudendal nerve-- SYMPATHETIC innervation to ext sphincter ( striated muscle)-helps in contractions..SO IF DAMAGED NERVE---no contraction of external sphincter.
hope it helps... plz correct me if anything wrong
___________________
Live as u were to die tommorow. Learn as if u were to live forever.
|
| sturge_weber
Forum Guru
Topics: 77
Posts: 1,034
|
hey thanks reet...
so that means if pelvic nerve gone, no internal sphincter relaxation and no urge to defecate
if pudendal nerve gone, no urge to defecate
thanks i got it now
|
| msyamp
Forum Guru
Topics: 61
Posts: 1,449
|
yes there is no sympathethetic innervation to anal spincter i think
___________________
If you think you can You can! If you think you cant you are right again!!
|
|
| |
| | | | |
Similar forum topics