L50: Autonomics of the Pelvis and Perineum Flashcards Preview

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Flashcards in L50: Autonomics of the Pelvis and Perineum Deck (29):
1

What 3 things does the autonomic nervous system control?

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

2

Post G sympathetics distributed to kidney via _____

Renal pelxus (periarterial plexus of renal artery)

3

Function of the renal plexus?

Ctrl of vascular tone (vaso constrict, vaso dilate)

4

PreG parasympathic via___ nerve function is unlcear

Vagus

5

____ of ureters lead to flow of urine to bladder

Peristalsis

6

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

Adjacent autonomic

7

Sympathetics control _______

Vascular tone

8

Parasympathetics promote

Peristalsis

9

The ____ ganglia sends out signals that are near

Closest

10

What is the vesical composed of?

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

11

What 3 type of splanchnics contribute to the vesical plexus?

Pelvic Lumbar Scaral

12

Lumbar and sacaral splanchnics carry _____ from the _______

Sympathetics from the sympathetic chain

13

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

Parasympathetics

14

What are the 4 innervation steps to bladder control?

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

15

Label the color of innervation steps in this picture.

Green: Symp

Red: Visceral non-pain

Purple: para

Blue: somatic motor (voluntary

16

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

17

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

Stretch recepters in bladder wall detect "fullness"

18

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

Contraction of bladder msucles

Relatxation of internal urethral sphincter

19

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

20

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

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)

21

During erection, what do sympathetics do?* 

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

22

During erection, what do parasympathetic do?* 

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

23

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

Local veins

24

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

Somatic

25

What 3 types does ejactulation exhibit?

1. Symp

2. Para

3. Somatic

26

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

Ejaculatory ducts and prostatic ducts

27

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

Sympathetics

28

During ejactulation, ____ cause contraction of smooth muscle of urethra

Parasympathetics

29

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

Somatic