Classification of Neurons (Exam 3) Flashcards Preview

Spring of 2012 > Classification of Neurons (Exam 3) > Flashcards

Flashcards in Classification of Neurons (Exam 3) Deck (16)
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0
Q

Multipolar neurons

A

3 or more processes coming from the cell body
Most common type
ALL stomatic efferent types

1
Q

Structural classification

A

Based on the number of processes coming from the cell body

Multipolar neurons
Bipolar neurons
Unipolar neurons

2
Q

Bipolar neurons

A

1 axon and 1 dendrite coming from the cell body (dendrite may branch)

Rare and specialized
Receptors in the retina and olfactory mucosa

3
Q

Unipolar neurons

A

1 process coming from the cell body that divides into two branches
Peripheral process
Central process

Most sensory neurons

4
Q

Peripheral process

A

Associated with sensory receptors

5
Q

Central process

A

Enter the CNS

6
Q

Functional classification

A

Baed on the direction the AP travels in relation to the CNS

Sensory/afferent
Internuerons
Motor/efferent

7
Q

Sensory/afferent

A

Most are unipolar or bipolar

Transmit APs from sensory receptors in the skin and viscera toward the CNS

8
Q

Internuerons

A

Most are multipolar
Live entirely within the CNS
Shuttle signals through e CNS pathways where integration takes place
Make up 99% of the neuronal population

9
Q

Motor/efferent

A

All are multipolar

Transmit APs from the CNS to effector organs (muscles and glands)

10
Q

Two factors that influence the rate of AP conduction

A

Axon diameter

Degree of myelination

11
Q

Axon diameter

A

The larger the diameter the faster the speed of the AP conduction

Large diameter offers less resistance to the electrical flow

12
Q

Degree of myelination

A

Myelinated axons exhibit “saltatory conduction”

Unmyelinated axons exhibit “continuous conduction”

13
Q

Group A fibers

A

Fastest
Somatic fibers tha there the skin, skeletal muscle, and joints
Largest in diameter
Heavily myelinated

14
Q

Group B fibers

A

Autonomic NS/visceral
Intermediate diameter
Lightly/moderately myelinated

15
Q

Group C fibers

A

Slowest
Autonomic NS/visceral
Smallest in diameter
Unmyelinated

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