Classification of Neurons

Question 1

4 Categories of structural classification of neurons:

Answer 1

1. Anaxonic
   2.Bipolar
   3.Unipolar
   4.Multipolar

Question 2

Anaxonic

Answer 2

Location: Brain and sensory organs

-Has axons, but they can not be told apart from dendrites

Question 3

Bipolar

Answer 3

Location: Sensory organs only!!

-has a fused dendrite and a axon extending from cell body

Question 4

Unipolar

Answer 4

Location: In the PNS. Specifically, in the sensory divison of the PNS.

-Built to SEND information.
-dendrite is conncected to the axon and NOT the cell body

-

Question 5

Multipolar Neuron

Answer 5

-most common neuron (99% of neurons are multipolar)

-major neuron in CNS

-Steryotypical barbie

Question 6

Functional classification of neuron categories: (there are 3)

Answer 6

1. Sensory (Affernt)
   2.Motor (Effernet)
   3.Interneruons

Question 7

Sensory neurons

Answer 7

-carry impules TO the Central Nervous System FROM the PNS
-most of them are unipolar
-cell bodies are found in ganglia close to the spinal cord
-10 milliom

Question 8

Efferent neruons

Answer 8

-Carry impulses AWAY from the CNS and to the PNS
-have about 1/2 million

Question 9

Interneurons

Answer 9

-transfer impulses between motor and sensory neruons in the CNS.
-Most of them are multipolar
-Most aboundant

Question 10

We have about ______ neurons. 99% of those are ______ and ______

Answer 10

We have about 100 Billion neurons.
99% of them are multipolar and interneurons

Question 11

Neuroglia (Gial cells)
-what are they?
-where are they primarily found?
-Are there more or less glial cells than neurons?

Answer 11

-cells that support and protect neruons
-They are primiarly found in CNS
-There are MORE glial cells than neuorns. there is a 10:1 ratio

Question 12

glial cells in the CNS:
Ependymal cell

Answer 12

-line central canal of spinal cord and ventricles in brain.
-help produce and circulate cerebrospinal fluid (CSF)

Question 13

glial cells in the CNS:
-Astrocyte

Answer 13

-largest and most abondent glial cell in CNS.
-secrete chemicals to help maintain blood brain barrier
-form structural framework in CNS,
-repair damaged nerve tissue,
-guide neural development

Question 14

glial cells in the CNS:
-Oligodentrites

Answer 14

form the myelin sheaths arround axons in CNS

Question 15

glial cells in the CNS:
Microgila

Answer 15

-Immune glial cell. smallest and rarest glial cell.

Question 16

Glial cells found in PNS and what they are

Answer 16

1. Satelite cell
   -surrond neuron cell bodies. play a role in regeneration of nerve and muscle tissue.

2.Schwann cell
form mylein sheaths around axons in the PNS