Neurons

Question 0

What are nuclei?

Answer 0

Compact groups of nerved cell bodies

ganglia in CNS

Question 1

What is the structure of a neuron?

Explain them.

Answer 1

Cell bodies: receive info
Axons: impulses away from cell
Synapses: communication between cells

Question 2

What do projection neurons do?

Answer 2

Carry impulses to other parts of CNS

Question 3

What are interneurons?

Answer 3

Short relay neurons

Question 4

What are axon bundles called? In SC?

Answer 4

Tracts/fasiculi

Columns/funiculi

Question 5

What are neuroglia?

Answer 5

Support cells that do not transmit signals

Question 6

What are nodes of Ranvier?

Answer 6

Small gaps on neuron where myelin is absent

Question 7

What is myelins function?

Answer 7

To increase speed of conduction and conserve energy

Question 8

What are the three fiber types? Explain them.

Answer 8

A fibers
Alpha-proprioception
Beta-touch/pressure
Gamma-motor to muscle spindles
Delta-pain, temp and touch
B fibers- small, conduct less rapidly
C fibers- smallest, slowest conducting

Question 9

LMN lesion symptoms?

Answer 9

Flaccidity, decreased or absent deep tendon reflexes, atrophy

Question 10

UMN lesion symptoms?

Answer 10

Increased deep tendon reflexes, spasticity, clonus, emergence of primitive reflexes including Babinski sign, exaggerated cutaneous reflexes, autonomic dysreflexia