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HISTO > Nervous tissue > Flashcards

Nervous tissue Flashcards

1
Q

Central nervous system

A
  • brain and spinal cord
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1
Q

Peripheral nervous system

A

– cranial and spinal nerve

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2
Q

Nervous tissue Consists of:

A

Neuron
Supporting cells (neuroglia)

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3
Q

Neuroglia found in CNS

A

Ependymal cells
Astrocytes
Oligodendrocytes
Microglia

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4
Q

Neuroglia in PNS

A

Satellite cells
Schwann cells

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5
Q

transmit electrical impulses from one site in the body to another, and receive and process
information

A

Neurons

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6
Q

are non-conducting cells that are in
intimate physical contact with neurons

A
  • Neuroglia
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7
Q

Functional unit of nervous
system

A

neurons

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8
Q

neurons consist of

A

cell body
processes (neurites)

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9
Q

types of neurites

A

axon
dendrites

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10
Q

long, cylindrical process
up to 1m

A

Axon

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11
Q

nissl substance absent

A

Axon

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12
Q

impulse – away from cell
body

A

Axon

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13
Q

commonly refer to as nerve fibers

A

Axon

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14
Q

Numerous, Highly branched

A

Dendrites

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15
Q

Terminate near the cell body

A

Dendrites

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16
Q

Nissl granules – present

A

Dendrites

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17
Q

Impulse – towards the cell body

A

Dendrites

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18
Q

– cell body of neuron; Unmyelinated

A

Gray matter

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19
Q

myelinated fibers

A

White matter

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20
Q

Aggregation of cell body
Within CNS – k/a –

A

nuclei

21
Q

Aggregation of cell body
Outside CNS – k/a –

A

ganglia

22
Q

Types of neurons are according to

A

a. According to the shape of cell body
b. According to variation in axon

23
Q

shape of the cell body dependent on the number
of processes arising from it.

A

a. According to the shape of cell body

24
Q

many processes arises from the cell body
eg: motor neurons

A

Multipolar neuron

25
Q

single dendrites and axon
eg: olfactory neuron, retina

A

Bipolar neurone

26
Q

single dendrite and the axon arise from common
stem of the cell body
eg: dorsal root ganglian

A

Unipolar neuron

27
Q

b. According to variation in axon
2 Types

A

Golgi type I
Golgi type II: (microneurons)

28
Q

Long axon and connect remote regions

A

Golgi type I

29
Q

Short axon and end near the cell body
Inhibitory in function

A

Golgi type II: (microneurons)

30
Q
  • Small diameter axon
  • Simple envelop by the cytoplasm
A

Non myelinated

31
Q
  • Large diameter fiber
  • Concentric layers
A

Myelinated fibers

32
Q

Afferent and efferent
nerve fiber

A

Peripheral nerve

33
Q

1 or more bundle
(fascicles) of nerve
fibers
within fascicle, each
nerve fibers with its
investing Schwann cells

A

endoneurium

34
Q

each fascicle is surrounded – tough Collagenous tissue
with epithelial Cell

A

perineurium

35
Q

if > 1 fascicle, further layer of loose collagenous tissue

A

epineurium

36
Q

Supporting cell also called

A

(neuroglia)

37
Q

Non neural cell
* Highly branches cell that occupy the space between
neurons
* Mechanical and metabolic support.

A

Supporting cell (neuroglia)

38
Q

Most numerous glial cell
Long branched processes

A

Astrocytes

39
Q

Small cell
* Mesenchymal in origin
* Elongated nuclei
* Little cytoplasm which forms, highly branch
process

A

Microglia

40
Q

Becomes active after damage (Microglia)

A

phagocytes

41
Q

Epithelial lining of ventricles and spinal canal
* Cuboidal to low columnar, and tightly bounded at
luminal surface

A

Ependyma

42
Q

Responsible for myelination of axon
* Wraps itself as spirally around a short segment of
axon
* Myelinate single axon

A

Schwann cell

43
Q

(lemnocytes, peripheral glial)

A

Schwann cell

44
Q

(capsular gliocytes)

A

Satellite cell

45
Q
  • Flat cell that surround the cell bodies of neuron of
    PNS ganglia
  • Regulate exchange of material between neuron cell
    bodies and interstitial fluid
A

Satellite cell

46
Q

Collection of cell body in PNS

A

Ganglion

47
Q

2 types Ganglion

A
  1. Sensory
  2. Autonomic
48
Q

(Ganglion) unipolar, Fibers passes centrally
* Ganglion cell located
peripherally

A

Sensory

49
Q

(Ganglion) multipolar, Neuron are scattered
throughout the ganglion
* Nerve fiber are non
myelinated and thinner
so, less conspicuous than
sensory

A

Autonomic ganglion

HISTO (4 decks)

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