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202 > Neural Tissues > Flashcards

Neural Tissues Flashcards

1
Q

How many neurons?

A

10 to the power of 11

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2
Q

How many synapses?

A

10 to the power of 14

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3
Q

How much does the brain weigh?

A

1.5kg

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4
Q

How many neurons in the enteric nervous system?

A

10 to the power of 8

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5
Q

What is a ganglion?

A

Group of cell bodies outside CNS

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6
Q

What is the difference between motor and sensory ganglion?

A

Motor- smaller neurons- eccentric nuclei

Sensory- big neurons, central nuclei

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7
Q

Which is primary motor cortex?

A

Brodmann area 4

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8
Q

Which is primary visual cortex?

A

Brodmann area 17

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9
Q

What is myelin purpose?

A

Increase conduction velocity and so increases diameter

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10
Q

Where can purkinje cells be found?

A

Cerebellum

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11
Q

Where can pyramidal cells be found?

A

Neocortex

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12
Q

Where can you find bipolar cells?

A

Retina

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13
Q

Which are true unipolar cells?

A

Rosa and cochlear hair cells

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14
Q

Pseudounipolar example?

A

One axon, one dendrite e.g dorsal root ganglion

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15
Q

Chemical synapse gap is?

A

30nm

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16
Q

Divergence example?

A

Skin

17
Q

Convergent example?

A

Retina

18
Q

What percentage of brain is interneurons?

A

80

19
Q

Inhibitory interneurons example?

A

Renshaw cells in grey matter either inhibit first alpha neuron and or an alpha motor neuron of the same motor pool

20
Q

Glia cells differ from neurons because?

A 
Do not form synapses
No action potentials
Able to divide
Form myelin sheaths 
Are most common source of tumour in nervous system
21
Q

Ratio of neurons to glia cells?

A

1:10-50

22
Q

Role of oligodendrocytes?

A

Production/maintenance of myself sheath in CNS

23
Q

Role of astrocytes?

A

Supports neurons through neuronal development and growth,, protection from harmful substances, control vasodilation of local blood vessels

24
Q

What is origin of microglia?

A

Mesodermal, develop from monocytes

25
Q

Role of ependymal cells?

A

Line brain ventricle and central canal of spinal cord. Form CSF

26
Q

Role of schwann cells?

A

Production/maintenance of myelin sheath, PNS regeneration

27
Q

Role of satellite cells?

A

Found in PNS, Support neurons, regulate exchange of materials between neurons and interstitial fluid

28
Q

Glioma?

A

Largest group of primary tumours derived from glia cells. Highly malignant
Grows fast, inside cranium, difficult to remove

29
Q

Neuroblastoma?

A

Most common in children
Outside cranium
Derived from neural crest cells from sympathetic NS

30
Q

What is often common in neuroblasomas?

A

Catecholamine levels are raised

202 (58 decks)

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