Autonomic nervous system Flashcards Preview

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Flashcards in Autonomic nervous system Deck (37):
1

what are the 3 main subdivisions of the autonomic nervous system

1 - sympathetic nervous system (SNS)
2- parasympathetic nervous system (PNS)
3- Enteric nervous system

2

what are some of the similarities b/w the somatic and autonomic nervous systems

-visceral sensory fibers
-acsending pathways
-descending motor pathways
-reflexes

3

what is the 1 difference b/w the somatic and autonomic nervous system

Autonomic nervous system efferent fibers use a 2 neuron chain (preganglionic and postganglionic)

4

in the ANS system, which fibers are myelinated, and which are NOT

preganglionic fibers = myelin
postganglionic = unmyelinated

5

where are sympathetic ganglia located ? where are parasympathetic ganglia located ?

SNS - in CNS
PNS - near innervated organ

6

what nuerotransmitter is/are used in the SNS

preganglionic = Ach
postganglionic = norepinephrine

7

what neurotransmitter is/are used in the PNS

Ach

8

where are preganglionic cell bodies located in the SNS, what about PNS

SNS -T1-L2
PNS-brainstem and S2-S4

9

if the SNS is activated, what physiological effects will it have on the cardiorespiratory system

increase heart rate, constrict vasculature, relax lungs

10

if PNS is activated, what effect will it have on cardiorespiratory system ?

decrease heart rate, dilate vasculature, contract lungs

11

if the SNS is activated what effects will it have on GI and GU systems

decrease peristalsis, constrict GI sphincters, ejaculate (shoot)

12

if PNS is activated, what effects will it have on GI and GU systems

increase peristalsis, relax GI sphincters, dilate penis (erection)

13

if SNS is activated what effects will it have on head

contract pupillary dilator, increase lacrimal and salivary gland secretion and increase viscosity

14

if pns is activated what effect will it have on head

contract pupillary sphincter and ciliary mm. increase secretion of lacrimal and salivary glands BUT decrease its viscosity

15

what CN are involved in the PNS

III, VII, IX, X

16

what is CN III preganglionic cell body of PNS called and where can it be found

Edinger-Westphal nucleus, found in rostral midbrain

17

where is CN III postganglionic cell body of PNS and what muscle does it act on

ciliary ganglion, pupillary constrictor and ciliary mm

18

what is the function of the ciliary muscle

accomodation of lens for near vision

19

what is the preganglionic cell body for CN VII of PNS and where is it found

superior salivatory nucleus, tegmentum of pons

20

what are the postganglionic cell bodies of CN VII of PNS , and what do they act on

pterygopalatine ganglion - nasal and lacrimal glands
submandibular ganglion - submandibular and sublingual glands

21

what is the preganglionic cell body of CN IX of PNS and where is it found

inferior salivatory nucleus, in the medulla

22

what is the post ganglionic cell body for CN IX of PNS and what does it act on

otic ganglion, parotid salivary gland

23

what are the preganglionic cell bodies of CN X of PNS and where are the located

dorsal motor nucleus
nucleus ambiguus
-both in medulla

24

where are the postganglionic cell bodies for CN X of PNS

in the walls of target tissue, dont get individual names cuz to many

25

where are the preganglionic cell bodies located for sacral PNS outflow

lateral horn

26

preganglionic SNS fibers have what 4 options after they leave the ventral root ?

1 - synapse in nearest ganglion
2 - ascend to superior cervical ganglion and head
3 - descend to lower back
4 -traverse chain and emerge as splanchnic nerves

27

what are prevertebral ganglia

colalteral ganglia - SNS ganglia that supply fibers to pelvic and abdominal viscera

28

what are the cervical ganglia

3 ganglia of SNS that take input to the head
-superior cervical ganglion
-middle cervical ganglion
-inferior cervical ganglion

29

what aids the cervical ganglion of the SNS to take input to the head

internal carotid artery

30

how do postganglionic fibers reach the head

through cervical ganglia and carotid plexus

31

what system has preganglionic cell bodies that project to the adrenal medulla

SNS

32

what is Horner syndrome

loss of SNS innervation to the face

33

what are the 4 characteristics of Horner syndrome

-ptosis (eyelid droop)
-miosis (small pupil)
-endopthalmos (sunken eye)
-anhydrosis (dry skin)

34

what does a pancoast tumor result in ?

destruction of superior cervical ganglion which takes input to head from SNS, one of the causes of Horner syndrome

35

what syndrome causes ones eyes to be 2 different colors

congenital horners syndrome, happens because lose SNS innervation to the face before age 2. Eye needs SNS to help generate pigment to eyes at young age

36

what is referred pain and how does it occur ?

when pain from viscera is felt at surface, occurs when a visceral structure is innervated by same cord level of a surface structure

37

what system provides primary control of secretion and innervation for the intestinal tract, bladder bladder, and pancreas

enteric nervous system