Intro to Neuropathology Flashcards

1
Q

percentage of genes coding for nervous system-related proteins

A

50%

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2
Q

selective vulnerability of the hippocampus

A

hypoxic/ischemic changes

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3
Q

selective vulnerability of the caudate nucleus

A

Huntington’s disease

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4
Q

selective vulnerability of the motor neurons

A

amyotrophic lateral sclerosis (ALS)

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5
Q

selective vulnerability of substantia nigra

A

Parkinson’s disease

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6
Q

type of neurons most resistant to injury

A

astrocytes

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7
Q

selective vulnerability of oligodendria

A

myelin disorders

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8
Q

3 types of glial cells

A

astrocytes, oligodendocytes, ependymal cells (NOT microglia)

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9
Q

if needed, microglia can transform into ..

A

histiocytes

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10
Q

Nissl substances are representative of

A

rough endoplasmic reticulum

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11
Q

what part of the neuron stains with H&E?

A

nucleic acids

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12
Q

major mechanisms of cellular injury

A

free radical injury, excitotoxic injury

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13
Q

examples of excitotoxic injury

A

glutamate, aspartate; depolarization; NMDA amino acid receptor

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14
Q

*what is the mechanism of excitotoxic injury?

A

injured neurons release their excitatory NTs (glutamate), which results in depolarization of the surrounding neurons through the inappropriate activation of NMDA receptors

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15
Q

how can you protect against excitotoxic injury?

A

antioxidants

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16
Q

excitotoxic injury via NMDA receptors results in..

A

calcium influx that interferes with mitochondrial function which eventually leads to cell death

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17
Q

characteristics of acute neuronal injury

A

eosinophilic necrosis (red), hypoxic injury, shrunken cytoplasm, dark smudgy chromatin, irreversible cell death

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18
Q

how long does it take for acute neuronal injury to show up on light microscopy?

A

12 hrs

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19
Q

hippocampus CA1 region (Sommer’s sector) is most sensitive to what type of injury?

A

hypoxic-ischemic

20
Q

subacute and/or chronic type of neuronal injury

A

degeneration

21
Q

the changes that occur in the neuron body in response to axonal injury is termed..

A

axonal reaction (formerly known as central chromatolysis); regenerative attempt

22
Q

examples of axonal reaction

A

damage to axon, margination of Nissl substance, central clearing of the cytoplasm, peripheral displacement of the nucleus, rounding of the cell body

23
Q

term for when an axon is transected, and the proximal portion starts to regenerate and myelinate

A

Wallerian degeneration

24
Q

if the BM is not intact during Wallerian regeneration, what is the outcome?

A

chaotic proliferation of axons, resulting in a painful nodule called traumatic or amputation neuroma

25
how are neuromas treated?
can be anastomosed to facilitate healing, or if damage is extensive, nerve transplantation can be done
26
what are axonal spheroids and how do they form?
when an axon is transected, the transport material going towards the synapse will accumulate at the site of injury
27
identification of axonal spheroids on path slides is important because..
it helps confirm presence of an infarct next to them; also in the diagnosis of such things as diffuse axonal injury
28
stain used to highlight axonal spheroids/swelling
silver stains
29
most common neuronal inclusion
viral inclusion
30
a neuronal inclusion seen with Parkinson's disease pathology
Lewy body
31
inclusion seen in Pick's disease/frontotemporal lobar degeneration
Pick's body
32
inclusion seen in alzheimer's
neurofibrillary tangles (accumulate in the cytoplasm)
33
what is trans-synaptic degeneration?
secondary degeneration of a neuron connected to a dying neuron; can be counter-intuitive; anterograde or retrograde
34
what physically happens to astrocytes when they react?
develop plump cytoplasm, processes become more prominent; indicates some pathology
35
inclusions representative of a hyperammonemia typically seen with cirrhosis
Alz type II glia (astrocytes)- nothing to do with Alz
36
astrocyte pathology typically seen with demyelinating diseases like MS
Creuzfeldt astrocyte
37
neuronal inclusion made of GFAP and B-crystalline
Rosenthal fibers (slow-progressing, in the cytoplasm)
38
fried egg appearance
oligodendrocytes
39
oligodendrocyte inclusions are seen in this disease
progressive multifocal leukoencephalopathy
40
the diagnostic value of oligodendrogial changes
satellitosis around neurons and blood vessels by the neoplastic cells infiltrating grey matter areas.
41
two major changes associated with reactive microglia & what they're associated with
microglial nodules, neuronophagia; most commonly associated with viral infections of the CN
42
PNS biopsies are usually taken from the..
sural nerve (entirely sensory)
43
pathologic characteristic of Charcot-Marie-Tooth disease
"onion bulb" Schwann cell in the PNS resulting from constant remyelination and demyelination
44
technique using chemical reactions to highlight certain tissue components like mucin, myelin, collagen
histochemistry
45
special staining technique for astrocytes using antibodies raised against specific components of cells
immunohistochemistry
46
in-situ hybridization is used to show the presence of
DNA segments