Peripheral Nerve Anatomy and Physiology - Travis' Lecture Flashcards Preview

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Flashcards in Peripheral Nerve Anatomy and Physiology - Travis' Lecture Deck (92)
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1

3 divisions of CNS

Spinal Cord

Brain Stem

Brain

2

Autonomic nuclei of SNS and PSNS innervates what 3 things.

Cardiac muscle

Smooth muscle

Organs (not under out control)

3

Peripheral Nervous System (PNS) includes all the neural tissue outside the ______.

CNS

4

______ are sensory structures that detect changes in the internal or external environment.

Receptors

5

The _______ ________ of the PNS brings information to the CNS from receptors in peripheral tissue and organs.

Sensory division

6

Information processing includes the ______ and _______ of information in the CNS

Integration Distribution

7

The ______ ________ of the PNS carries motor commands from the CNS to peripheral tissues and systems.

Motor division

8

Somatic NS controls _____ muscle contractions

Skeletal

9

(Per Image from slides). ANS provides autonomic regulation of what 4 components? Travis only listed 3.

Smooth muscle Cardiac muscle Glands Adipose

10

______ are target organs who activities change in response to neuronal commands.

Effectors

11

Somatic NS includes both receiving ____information and relaying _____ commands to muscles.

Sensory Motor

12

Cell body of a neuron.

Soma

13

______ receive information and transmit to the cell body. (part of neuron)

Dendrites

14

"Functional unit" of a neuron. Carries response of a neuron in the form of a propagated action potential.

Axon

15

Supports and insulate axon Supply metabolites and distribute neurotransmitters

Schwann

16

Segments of neuron that do not contain myelin? Responsible for conduction propagation thru _____ channels.

Nodes of Ranvier Sodium

17

Why are nodes of ranvier thought to be the site of action of local anesthetics.

No myelin sheet means limited diffusion barriers for locals to get into the axon.

18

Nodes of Ranvier are responsible for _____ conduction.

Saltatory

19

(neuron component) Releases electric signal from presynaptic cell. Synapse with effector cell or another nerve cell.

Axon terminal

20

Space between axon terminal and dendrite (pre and post-synaptic area).

Synaptic cleft.

21

(PNS components) Surrounds perineurium Composed of connective tissue and holds fascicles together.

Epineurium

22

(PNS components) Connects tissue which surrounds each nerve fiber fascicle.

Perineurium

23

(PNS components) Surrounds and embeds axon within the fasciculi.

Endoneurium

24

A bundle of axons together

Fasciculi

25

Epineurium, perineurium and endoneurium are all types of _______ tissue that function as _____ in which local anesthetics must diffuse through in order to get to specific axons of neurons.

Connective Barriers

26

Which is a myelinated vs unmyelinated and label the parts.

a. myelinated

b. unmyelinated (all purple is single schwan cell)

A. Node of Ranvier

B. Axon

C. Myelin Sheeth

D. Axon

 

27

(Unmyelinated nerve) A single _____ cell covers several axons in a bundle.

Schwann

28

(Large Nerves) The schwann cells cover a single axon and form several layers of the liquid ______.

Myelin

29

Compared to unmyelinated nerves, myelinated nerves are...

Larger

Conduct impulses faster

More difficult to block with locals

30

Myelinated nerves work by ______ conduction.

Saltatory