Cells of the Nervous System Flashcards

1
Q

Central nervous system components (2)

A

Brain

Spinal cord

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2
Q

Peripheral nervous system components (2)

A

Cranial nerves

Spinal nerves

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3
Q

About how many neurons in the human brain?

A

Over 86 billion

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4
Q

2 types of cells in nervous system

A

Neurons

Glia

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5
Q

Dendrite function

A

Receive signals

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6
Q

Soma function

A

Integrate signal

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7
Q

Axon function

A

Send signal

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8
Q

How many axon(s) does a neuron have?

A

1

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9
Q

Relatively speaking, how many dendrite(s) does a neuron have?

A

More than 1

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10
Q

Synapse

A

Point of contact between neurons

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11
Q

Post-synaptic: dendrite or axon?

A

Dendrite

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12
Q

Pre-synaptic: dendrite or axon?

A

Axon

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13
Q

Synaptic cleft

A

Space between axon and dendrite

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14
Q

Soma

A

Neuron cell body

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15
Q

Axon hillock

A

Site of action potential initiation

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16
Q

Golgi

A

Protein packaging and delivery

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17
Q

Endoplasmic reticulum: what is it, what is synthesized there

A

Processing center

Synthesized: proteins (rough), lipids (smooth)

18
Q

Nucleus

A

Command center

DNA replication and transcription

19
Q

Ribosomes

A

Protein synthesis

20
Q

5 ways neurons are classified

A
Location
Connections
Morphology
Functionality
Gene expression
21
Q

Projection neuron: definition and example

A

Neuron that has dendrites and cell body in one region, but axon projects to and synapses in another region (ex: motor neuron- cell body in spinal cord, synapses on muscle)

22
Q

Efferent

A

Exiting from

Ex: motor neuron is efferent from spinal cord

23
Q

Afferent

A

Going to

Ex: motor neuron is afferent to muscle

24
Q

Interneurons

A

Receive and send signals in the same region

25
Example of interneuron
Inhibitory interneurons in spinal cord
26
Excitatory
Activates neuron it synapses on
27
Inhibitory
Reduces activity of neuron it synapses on
28
Can projection neurons and interneurons be excitatory, inhibitory, or both?
Both
29
Unipolar neuron
Soma with 1 neurite/process (has branches, but not well defined)
30
Pseudo-bipolar or pseudo-monopolar neuron
Axon has split into 2 branches: soma is attached at the side
31
Bipolar neuron
Soma with 2 extensions: 1 axon and 1 dendrite
32
Multipolar neuron
Most common type of neuron | 1 axon, more than 1 dendrite
33
Which is more numerous, glia or neurons? How many times more of one than the other?
Glia: 10-50 times more than neurons
34
Glia functions (5): regulate ____ ____ around neuron, ____ and ____, _____ neuron ______, ___ neurons, recycle _____
``` Regulate chemical environment around neuron Repair and regeneration Support/stabilize neuron organization Feed neurons Recycle neurotransmitters ```
35
Function of myelination
Increase action potential conduction velocity
36
2 types of glial cells that are involved in myelination
``` Oligodendrocytes (CNS) Schwann cells (PNS) ```
37
2 types of glial cells that protect from infection and damage
Astrocytes | Microglia
38
What is the specific role of astrocytes?
Form blood-brain barrier
39
What is the specific role of microglia?
Scavenge dead cells
40
Tripartite synapse
Astroglia surround the synapse and play a role in synaptic function