L50: Autonomics of the Pelvis and Perineum

Question 1

What 3 things does the autonomic nervous system control?

Answer 1

1. Micturition (urination) 2. Defecation 3. Control of erectile tissues

Question 2

Post G sympathetics distributed to kidney via _____

Answer 2

Renal pelxus (periarterial plexus of renal artery)

Question 3

Function of the renal plexus?

Answer 3

Ctrl of vascular tone (vaso constrict, vaso dilate)

Question 4

PreG parasympathic via___ nerve function is unlcear

Answer 4

Vagus

Question 5

____ of ureters lead to flow of urine to bladder

Answer 5

Peristalsis

Question 6

Source of ureteric innervation varies because ureters are innervated b _________ structures

Answer 6

Adjacent autonomic

Question 7

Sympathetics control _______

Answer 7

Vascular tone

Question 8

Parasympathetics promote

Answer 8

Peristalsis

Question 9

The ____ ganglia sends out signals that are near

Answer 9

Closest

Question 10

What is the vesical composed of?

Answer 10

Mix of sympathetic and parasympathetic nerves that control muscles of teh wall of the bladder

Question 11

What 3 type of splanchnics contribute to the vesical plexus?

Answer 11

Pelvic Lumbar Scaral

Question 12

Lumbar and sacaral splanchnics carry _____ from the _______

Answer 12

Sympathetics from the sympathetic chain

Question 13

Pevic splanchnics carry ______ from the S2-4 spinal cord levels

Answer 13

Parasympathetics

Question 14

What are the 4 innervation steps to bladder control?

Answer 14

1. Symp 2. Visceral non-pain 3. Parasymp 4. Somatic Motor (voluntary)

Question 15

Label the color of innervation steps in this picture.

Answer 15

Green: Symp

Red: Visceral non-pain

Purple: para

Blue: somatic motor (voluntary

Question 16

The sympathetic component of urination is composted of contraction of what and relaxiation of what?

Answer 16

Contraction of the internal urethral sphincter

Relaxation of the bladder muscles allows the baldder to fill and prevents emptying

Question 17

What do the stretch receptors of visceral non-pain detect during urination?

Answer 17

Stretch recepters in bladder wall detect “fullness”

Question 18

What is contracted and what is relaxed during parasymp innervation during urination?

Answer 18

Contraction of bladder msucles

Relatxation of internal urethral sphincter

Question 19

What does the pudendal nerve do during somatic motor (voluntary) innervation during urination?

Answer 19

Pudendal nerve maintains tonic contraction of external urethral sphincter until voluntarily inhibite

Question 20

In defecation, three nervous components to remember. Describe each.

Answer 20

1. Symp
   - Inhibit peristalsis of rectum
   - Tonic contraction of internal anal sphincter
2. Para
   - stimulate peristalsis and secretion of colorectal glands
   - Relax internal anal sphincter, stim persitalsis of anal canal
3. Somatic
   - Voluntary relaxation of somatic muscles (eg external anal sphincter, puborectalis)

Question 21

During erection, what do sympathetics do?*

Answer 21

Keep phallus flaccid by keeping open an arterio-venous shunt that keeps blood OUT OF ERECETILE BODIES

Question 22

During erection, what do parasympathetic do?*

Answer 22

Cavernous nerves closes the shunt, trapping blood in the erctile bodies and causing erection

Question 23

When the erectile bodies swell, they put futher presure on _______ and entrap blood

Answer 23

Local veins

Question 24

Contraction of the ____ muscles of the penis by the pudendal nerve futher impedes the return of venous blood and augments the erectile process

Answer 24

Somatic

Question 25

What 3 types does ejactulation exhibit?

Answer 25

1. Symp
2. Para
3. Somatic

Question 26

Semen is delievered to the prostatic urethra through the ______ ducts and ____ ducts

Answer 26

Ejaculatory ducts and prostatic ducts

Question 27

During ejactulation, ____ close the internal urethral sphincter to prevent retrograde ejaculation

Answer 27

Sympathetics

Question 28

During ejactulation, ____ cause contraction of smooth muscle of urethra

Answer 28

Parasympathetics

Question 29

During ejactulation, ____ spinal reflex causes contraction of the bulbospongiosus muscle via pudendal nerve

Answer 29

Somatic