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Flashcards in Introduction Lec01 Deck (22)
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1
Q
What do the oligodendrocyte processes do?
A
provide electrical insulation for neurons by forming myelin sheath

this speeds up the transmission of AP along an axon (saltatory transmission)

2
Q
which glial cells develop from emybronic ectoderm
A
oligodendrocytes

astrocytes
3
Q
which glial cell in cns is notable for its small size?
A
microglia
4
Q
Where are microglia derived from?
A
from hematopoetic sources
5
Q
what is characteristic about oligodendrocytes?
A
their limited number of dendritic processes
6
Q
what are the functions of microglia
A
To provide a protective function to nervous tissue in that they can become phagocytic
7
Q
what are the best predictors of intelligence
A
Foliation and neuronal density
8
Q
describe the appearence of sensory neurons
A
long dendrites, short axons
9
Q
describe the appearence of motor neurons
A
long axons, short dendrites
10
Q
what types of support do astrocytes provide to neurons
A
metabolic and mechanical
11
Q
where are interneurons found
A
only in the CNS
12
Q
In an astrocyte, what does the long cytoplasmic processes do?
A
bridge neurons and capillary endothelial cells;
13
Q
free nerve endings are most sensitive to
A
pain and temperature
14
Q
what mechanoreceptors have thicker myelinated surfaces?
A
: Pacinian and Meissner corpuscles (light touch and vibration), Ruffini corpuscles and Merkel disks (sustained pressure)
15
Q
which mechanoreceptors are involved with light touch
A
pacianian and meissner
16
Q
which mechanoreceptors are involved with sustained pressured
A
ruffian and merkels
17
Q
pacinian corpuscle is involved with
A
vibration
18
Q
meissner corpuscle is involved with
A
light touch
19
Q
what is the importance of ensembles of neurons?
A
functional responses and representations of the body superimposed on cellular maps
20
Q
example of upper level ensemble?
A
somatosensory maps in cortex
21
Q
tilting of a platform results in
A
rapid adaption
22
Q
what are the 5 features of an advanced nervous system?
A
1) cellular specializations
2) areal specializations (collections of cells grouped together for common purpose)
3) Functional cooperation (ensembles of neurons acting in synchrony to produce desired outcome) 4) Adaptability
5) High information storage cap