Peripheral Nervous System (Exam 3) Flashcards Preview

Spring of 2012 > Peripheral Nervous System (Exam 3) > Flashcards

Flashcards in Peripheral Nervous System (Exam 3) Deck (51)
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The efferent division is divided into two parts

Somatic
Autonomic

1

Affectors

Somatic- skeletal muscle
Autonomic- smooth and cardiac muscle, glands, viscera

2

Pathway

Somatic- single neuron
Autonomic- 2 neuron chain with a synapse in between

3

Neurotransmitters

Somatic- Ach
Autonomic- Ach, epinephrine, neuroepinephrine

4

Neurotransmitter effect on target cell

Somatic- always excitatory
Autonomic- excitatory or inhibitory

5

Cholinergic fibersq

Fibers that release Ach

6

Adrenerhic fibers

Neurons that release epinephrine and neuroepinephrine

7

Cholinergic receptors

Bind and respond to Ach

Nicotinic 1&2
Muscarinic 1,2,&3

8

Adrenergic receptors

Binds and respond to epinephrine and neuroepinephrine

Alpha 1&2
Beta 1&2

9

Preganglionic fibers

Neuron whose cell body lies in the CNS
Releases NT that across a Neuro-neuronal synapse and binds with a second neuron

10

Postganglionic fiber

Neuron whose cell body lies in the PNS
Binds to the NT released from the postganglionic fiber
Axon extends to the effector organ
Releases NT that bind to the effector organ

11

Autonomic NS is divided into two parts

Parasympathetic and sympathetic

12

Dual innervation

Most viscera is innervated by both the parasympathetic and the sympathetic NS

13

Autonomic tone

One division is exhibiting more tone depending on what the body needs

14

Parasympathetic and sympathetic ______ each other and _______ are active all the time

Oppose
Both

15

Function of the parasympathetic NS

Rest and digest
Vegetative and Maintance activities
Conservation of ATP

Ex. Decrease HR, decrease BP, increase digestive function

16

Function of the sympathetic NS

Fight or flight
Prepares body to deal with an energetic situation
Uses ATP

Ex. Increase HR, increase BP, decrease digestive function

17

Origin sites of preganglionic fibers

Sympathetic- thoracolumbar region of the spinal cord (T1-L2)
Parasympathetic- cranial and spinal nerves

18

Occulomotor (3)

Smooth muscle of the eye that influences pupil size and eyeball movement

19

Facial (7)

Nasal glands
Lacrimal glands
Submandibular and sublingual salivary glands

20

Glassopharyngeal (9)

Parotid salivary gland

21

Vagus (10)

90% of the parasympathetic supply
Branches into the
Cardiac plexus
Pulmonary plexus
Esophageal plexus
Descending aortic plexus

22

Cardiac plexus

Innervates the heart

23

Pulmonary plexus

Innervates the lungs and bronchi

24

Esophageal plexus

Innervates the esophagus

25

Descending aortic plexus

Innervates most abdominal viscera

26

Sacral region of the spinal cord Innervates:

Distal half of the large intestine
Urinary bladder
Reproductive organs

27

Location of ganglia (origin of postganglionic fiber)

Sympathetic- sympathetic ganglionchain
Collateral ganglion
Adrenal medulla
Parasympathetic- terminal ganglion

28

Sympathetic ganglionchainq

Close to the spinal cord

29

Collateral ganglion

Midway between the spinal cord and the effector organ

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