Mod3-Obj5: 3 types of neurons, their function and structure

Question 1

Based on their structure, neurons are classified as:

Answer 1

1. ) Multipolar
2. ) Bipolar
3. ) Unipolar

Question 2

Multipolar

Answer 2

Have three or more more processes, one axon and the rest dendrites
-Major neuron type in the CNS

Question 3

Bipolar neurons

Answer 3

Have two processes, an axon and a dendrite that extend from opposite sides of the cell body
-Rare neurons

Question 4

Unipolar neurons

Answer 4

Unipolar neurons have a single short process that emerges from the cell body and divides into proximal and distal branches. The more distal process, the peripheral process, is often associated with a sensory receptor. The central process enters the CNS

• Common PNS
• have receptive endings (sensory terminals) at the end of the peripheral process

Question 5

According to function, neurons are classified as:

Answer 5

1. ) Sensory neurons
2. ) Interneurons
3. ) Motor neurons

Question 6

Sensory neurons

Answer 6

Conduct sensory signals from receptors to the CNS

• Are unipolar in structure
• Dendrites often act as sensory receptors
• Form the sensory division of the PNS

Question 7

Interneurons

Answer 7

Form tracts, determine reponses, if damaged can’t be repaired or replaced

• Located in, and conduct signals through the CNS
• Perform integrative function of the nervous system
• Multipolar

Question 8

Motor neurons

Answer 8

Conduct motor signals away from the CNS to and effector muscles or gland

• Main multipolar
• Form the motor division of the PNS