Introduction Lec01 Flashcards
What do the oligodendrocyte processes do?
provide electrical insulation for neurons by forming myelin sheath
this speeds up the transmission of AP along an axon (saltatory transmission)
which glial cells develop from emybronic ectoderm
oligodendrocytes
astrocytes
which glial cell in cns is notable for its small size?
microglia
Where are microglia derived from?
from hematopoetic sources
what is characteristic about oligodendrocytes?
their limited number of dendritic processes
what are the functions of microglia
To provide a protective function to nervous tissue in that they can become phagocytic
what are the best predictors of intelligence
Foliation and neuronal density
describe the appearence of sensory neurons
long dendrites, short axons
describe the appearence of motor neurons
long axons, short dendrites
what types of support do astrocytes provide to neurons
metabolic and mechanical
where are interneurons found
only in the CNS
In an astrocyte, what does the long cytoplasmic processes do?
bridge neurons and capillary endothelial cells;
free nerve endings are most sensitive to
pain and temperature
what mechanoreceptors have thicker myelinated surfaces?
: Pacinian and Meissner corpuscles (light touch and vibration), Ruffini corpuscles and Merkel disks (sustained pressure)
which mechanoreceptors are involved with light touch
pacianian and meissner
which mechanoreceptors are involved with sustained pressured
ruffian and merkels
pacinian corpuscle is involved with
vibration
meissner corpuscle is involved with
light touch
what is the importance of ensembles of neurons?
functional responses and representations of the body superimposed on cellular maps
example of upper level ensemble?
somatosensory maps in cortex
tilting of a platform results in
rapid adaption
what are the 5 features of an advanced nervous system?
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
