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Flashcards in ANS Ch 16 Deck (45)
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1

ANS

System of motor neurons that innervates smooth and cardiac muscles and glands. Also called involuntary or visceral motor system.

2

Two neuron chain

ANS uses two neurons to reach the effector unlike the CNS that uses only one

3

Preganglionic neuron

First neuron whose body lies lies within the brain or spinal cord, it synapses with the second motor neuron.

4

Post ganglioninc neuron

Second motor neuron whose cell body is within the autonomic ganglion outside the CNS.

5

2 autonomic neurotransmitters

Acetylcholine
Epi and Nor Epi

6

Autonomic postganglionic fibers release?

Epi and Nor Epi
Secreted by most sympathetic fibers

7

Parasympathetic fibers release

ACh

8

Dual Innervation

Two divisions of the ANS--sympathetic and parasympathetic--balance each other out
Some organs only receive sympathetic stimulation but vital organs have both.

9

Parasympathetic

Rest and digest:
Craniosacral: originate in brain and sacrum
Long preganglion short post ganglion fibers
Ganglion are close to organ served

10

Sympathetic

Fight or flight:
Thoracolumbar: originate in thoracic and lumbar
Short preganglion and long post ganglion fibers
Ganglion are close to spinal cord

11

Cranial Part

Oculomotor (III)
Facial (VII)
Glossopharyngeal (IX)
Vagus (X)

12

Oculomotor nerve

Innervated the smooth muscles of the eye that causes the pupil to constrict and lens to bulge. Synapse in the ciliary ganglia

13

Facial nerves

Activate nasal glands and lacrimal glands: pterygopalatine ganglia
Stimulate sublingual salivary glands: submandibular ganglia

14

Glossopharyngeal nerves

Synapse in the otic ganglia. Activate parotid salivary glands anterior to the ears

15

Vagus Nerve

Account for 75% or preganglionic parasympathetic fibers and innervate virtually every thoracic and abdominal oregan

16

Sacral Part

Serves pelvic organs and distal half of the intestines. S1-S4 forn the pelvic splanchnic nerves.

17

Sympathetic Division

Arise from T1 - L2,
Thoracolumbar division

18

3 locations of sympathetic ganglionic neurons

Sympathetic chain ganglia (paravertebral)
Collateral ganglia (prevertebral)
Adrenal medulla (release neurotransmitters into the blood stream)

19

Cholinergic fibers

Fibers that release ACh, effects are always excititory

20

Adernergic fibers

Fibers that release NE,

21

Cholinergic receptors

ACh binding receptors
Nicotinic
Muscarinic

22

Nicotinic Receptors

Ach receptor
Affects are always stimulatory
Found on all postganglionid neurons both sympathetic and parasymathetic
Neuromuscular junctions

23

Muscarinic Receptors

Ach receptor
Either inhibitory or stimulatory
Cardiac=slows
Smoth muscle=increases

24

Adenergic receptors

NE Binding Receptors
Alpha
Beta

25

NE and Epinephrine

Can be either excitatory or inhibitory
depending on target organ

26

Sympathetic or vosomotor tone

Partial continual blood vessal constriction, dilate slightly and constrict slightly to maintain BP

27

Parasympetheitc tone

Slows heart rate and dictates normal activity in the digestive and urinary tracts

28

Uniquely sympathetic functions

Thermoregulatory responce to heat
Release of Renin from Kidneys
Metobolic rate regulation

29

Localized affects

Parasympatheitc only has localized affects

30

Localized and Diffuse affects

Parasympathetic is both
NE is not hydrolysed as fast as ACh
NE and Epinephrine are released into the boold streem by the Adrenal glands and have a longer lasting effect.