L50: Autonomics of the Pelvis and Perineum Flashcards
What 3 things does the autonomic nervous system control?
- Micturition (urination) 2. Defecation 3. Control of erectile tissues
Post G sympathetics distributed to kidney via _____
Renal pelxus (periarterial plexus of renal artery)
Function of the renal plexus?
Ctrl of vascular tone (vaso constrict, vaso dilate)
PreG parasympathic via___ nerve function is unlcear
Vagus
____ of ureters lead to flow of urine to bladder
Peristalsis
Source of ureteric innervation varies because ureters are innervated b _________ structures
Adjacent autonomic
Sympathetics control _______
Vascular tone
Parasympathetics promote
Peristalsis
The ____ ganglia sends out signals that are near
Closest
What is the vesical composed of?
Mix of sympathetic and parasympathetic nerves that control muscles of teh wall of the bladder
What 3 type of splanchnics contribute to the vesical plexus?
Pelvic Lumbar Scaral
Lumbar and sacaral splanchnics carry _____ from the _______
Sympathetics from the sympathetic chain
Pevic splanchnics carry ______ from the S2-4 spinal cord levels
Parasympathetics
What are the 4 innervation steps to bladder control?
- Symp 2. Visceral non-pain 3. Parasymp 4. Somatic Motor (voluntary)
Label the color of innervation steps in this picture.
Green: Symp
Red: Visceral non-pain
Purple: para
Blue: somatic motor (voluntary
The sympathetic component of urination is composted of contraction of what and relaxiation of what?
Contraction of the internal urethral sphincter
Relaxation of the bladder muscles allows the baldder to fill and prevents emptying
What do the stretch receptors of visceral non-pain detect during urination?
Stretch recepters in bladder wall detect “fullness”
What is contracted and what is relaxed during parasymp innervation during urination?
Contraction of bladder msucles
Relatxation of internal urethral sphincter
What does the pudendal nerve do during somatic motor (voluntary) innervation during urination?
Pudendal nerve maintains tonic contraction of external urethral sphincter until voluntarily inhibite
In defecation, three nervous components to remember. Describe each.
- Symp
- Inhibit peristalsis of rectum
- Tonic contraction of internal anal sphincter - Para
- stimulate peristalsis and secretion of colorectal glands
- Relax internal anal sphincter, stim persitalsis of anal canal - Somatic
- Voluntary relaxation of somatic muscles (eg external anal sphincter, puborectalis)
During erection, what do sympathetics do?*
Keep phallus flaccid by keeping open an arterio-venous shunt that keeps blood OUT OF ERECETILE BODIES
During erection, what do parasympathetic do?*
Cavernous nerves closes the shunt, trapping blood in the erctile bodies and causing erection
When the erectile bodies swell, they put futher presure on _______ and entrap blood
Local veins
Contraction of the ____ muscles of the penis by the pudendal nerve futher impedes the return of venous blood and augments the erectile process
Somatic
What 3 types does ejactulation exhibit?
- Symp
- Para
- Somatic
Semen is delievered to the prostatic urethra through the ______ ducts and ____ ducts
Ejaculatory ducts and prostatic ducts
During ejactulation, ____ close the internal urethral sphincter to prevent retrograde ejaculation
Sympathetics
During ejactulation, ____ cause contraction of smooth muscle of urethra
Parasympathetics
During ejactulation, ____ spinal reflex causes contraction of the bulbospongiosus muscle via pudendal nerve
Somatic
