PNS terminology

Question 1

Axon

Answer 1

projection of a nerve away from the cell body that conducts impulses

Question 2

Dendrite

Answer 2

An extension of the cell body that receives signals from other neurons

Question 3

Endoneurium

Answer 3

Innermost covering of a peripheral nerve. Surrounds each individual axon

Question 4

Epineurium

Answer 4

Outermost layer. Surrounds entire nerve and provides a buffer for peripheral nerve

Question 5

Motor unit

Answer 5

A single motor neuron and all of the muscle fibers it innervates

Question 6

Myelin

Answer 6

proteins and lipids
Surrounds nerve in a sheath form
Increases conduction

Question 7

Nerve conduction velocity

Answer 7

speed of impulse along the axon of a nerve

Question 8

Neuron

Answer 8

Nerve cells that receive and send signals to around nerve cells. Composed of cell body, axon, dendrite

Question 9

Nodes of Ranvier

Answer 9

Small gaps in myelination

Facilitates rapid conduction of a nerve impulse via jumping from gap to gap.

Question 10

Saltatory conduction

Answer 10

Jumping transmission
Decreases use of sodium potassium pump
Increase conduction

Question 11

Perineurium

Answer 11

Middle layer surrounding the peripheral nerve that envelopes fascilces or groups of exaons and maintain blood nerve barrier

Question 12

Schwann Cell

Answer 12

Cells that cover the nerve fivers within the peripheral nervous system to form myelin sheath