2.2.1. ANS Flashcards Preview

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Flashcards in 2.2.1. ANS Deck (36)
1

What does the ANS do?

The ANS controls the body’s internal environment and the functions of organ systems in an involuntary fashion

2

What are the functional divisions of the ANS

Parasympathetic
Sympathetic
Enteric

3

Where do we find splanchnic nerves?

Sacral spinal cord

4

Where do we find visceral ganglia?

In the organ they innervate

5

What nerves do we find in the brainstem?

Cranial nerves

6

What does the myenteric plexus control?

Peristalsis (coordination of the rhythmic contract-shorten-contract-shorten movement of the muscularis externa

7

Peristalsis?

rhythmic contract-shorten-contract-shorten movement of the muscularis externa (moves your bowels to squeeze stuff out of you :) )

8

What does the submucosalplexus control?

Muscularis mucosae and villi (shortening of villi and a squishing out of nutrients in the crypts and between villi)

9

Main neurotransmitters for the sympathetic nervous system?

Catecholamines

10

Idea of the sympathetic nervous system.

Fight or flight response and homeostasis

11

Parasympathetic Nervous System idea

The parasympathetic ANS regulates internal organs or glands and controls the ‘rest and digest’ and ‘feed and breed’ activates of the body when at rest.

12

Main neurotransmitter of the parasympathetic nervous system

acetylcholines

13

Neurotransmitters of the enteric ANS

Acetylcholine, serotonin and dopamine

14

What is another name for glia?

Schwann cells

15

Two functions of the PNS?

1. Transmit signals from the CNS to peripheral tissues
2. Receive and transmit information from the environment to the CNS

16

Efferent neurons

transmits signals from CNS to peripheral tissues

17

Afferent neurons

Receive and transmit information from the environment to the CNS

18

Peripheral nerve infrastructure

-Axons and their supporting Schwann cells in peripheral nerve are held together by connective tissue and travel in bundles called fascicles

19

Epineurium

connective bundle sheath that holds a collection of neurons together

20

Perineurium

Surrounds a fascicle of nerve fibers. Must be rejoined in microsurgery for limb reattachment

21

Endoneurium

Invests single nerve fiber layers; is a layer of delicate connective tissue around the myelin sheath of each myelinated nerve fiber

22

Where are schwann cells in the CNS?

There aren't any

23

What do schwann cells do?

schwann cells produce the myelin and enwrap all large diameter axons (>1.0um).

24

What embryonic layer do Schwann cells come from?

Neural crest

25

What are the presynaptic neurpns of the brainstem?

Cranial nerves

26

What are the presynaptic neurons of the organs?

Visceral ganglia

27

What are the presynaptic neurons of the sacral spinal cord?

Splanchnic nerves

28

Presynaptic neurons in the cervical and upper lumbar spinal cord?

Paravertebral ganglion

29

What does the Enteric ANS control?

The submucosal plexus and the myenteric plexus

30

What is a ganglia?

a cluster of sensory (e.g. dorsal root ganglia) or autonomic (sympathetic or parasympathetic) neuronal cells bodies

31

Sensory receptors:

1. Free nerve endings
2. Pacinian Corpuscles
3. Krausener's Corpuscles
4. Meissner's Corpuscles

32

Free nerve endings

pain

33

Pacinian corpuscles

Mechanoreceptor for pressure

34

Krause?

Vibration for high frequency at the clitoris and penis

35

Meissner's corpuscles

Mechanoreceptor light touch (fingers and lips)

36

Trace an example reflex arc from a meissner's corpuscle.

meissner senses signal, then the signal travels down the sensory ganglion into the dorsal horn of the spinal cord via the dorsal root. Then, signal is sent via synaptic contact to the motor neuron which shares the same nerve as the sensory neuron