Pelvic Cavity Flashcards
The anal canal is enclosed by what 2 sphincters?
- External anal sphincter - Internal anal sphincter
What is the name of the folds within the rectum?
Transverse rectal folds
The rectum is enclosed by what two junctions?
- rectosigmoid junction
- anorectal junction
Arteries of the rectum
- Superior rectal a
- Internal iliac a: middle rectal; internal pudendal a.
- Inferior rectal a. (Off of internal pudendal a.)
What artery supplies the anorectal junction and anal canal?
Inferior rectal a. off of the internal pudendal a. off of the internal iliac a.
Superior rectal v (drain IMV->Poral system) forms a portal caval anastomosis with what plexus?
External and internal rectal venous plexus: supplied by internal iliac-> middle rectal vein, internal pudendtal v -> inferior rectal vein
Sympathetics of the rectum
Lumbar splanchnic nn.
Parasympathetics of the rectum?
pelvic splanchnic nn (S2-4)
Visceral pain of rectum
Below pain line: follow parasympathetic pathway (pelvic splanchnic nn. S2-4)
Blood supply to ureters
Multiple branches from renal a.; gonadal a.; internal iliac a.
Where does the bladder lie in adults? in Infants/young children?
Adults: within the pelvic cavity
Infants/youn children: Abdomen
What fascia surround the bladder?
endopelvic fascia
What ligament connect the urethra from the bladder to the levator ani muscles
lateral ligament of bladder
What is the base/posterior surface of the bladder called
Fundus
Apex of the bladder has what ligament attached to it?
Median umbilical ligament
The areas where the ureters enter the bladder are referred to as?
ureteric orifices
The area where the urethra exits the bladder is referred to as ?
internal urethral orifice
What is the triangular space created by the ureteric orifices and urethra in the bladder?
Trigone
What muscle surrounds the bladder?
Detrusor m
Sympathetic innervation of the bladder
lumbar splanchnic nn
Purpose:
- maintain tonic contraction to allow filling
- contract internal sphincter during ejaculation
What is the importance of the visceral reflexive afferents of the bladder?
detect fullness of bladder
Parasympathetics of bladder; purpose?
Pelvic splanchnic nerves (S2-4)
Purpose
- motor to contract detrusor m.
- Inhibit internal urethral sphincter
Visceral afferent: Pain of bladder
- Portions above pain line (intraperitoneal): follow sympathetic pathway
- Portions below pain line (subperitoneal): Follow parasympathetic pathway