Terms in this set (23)
what are schwann cells?
glia of the PNS that are derived from neural crest cells
what are schwann cells named after?
the person who described them
can schwann cells come in multiple different shapes?
what sits inside these troughs?
neurons whose axon has a small diameter
what are nonmyelinating schwann cells?
fairly shapeless cells, that have little troughs on their surface. The axons of neurons that have small diameter axons often just sit inside these troughs but their somas and their axon terminals extend outside of the schwann cells
do nonmyelinating axons receive any support from the schwann cells?
yes but they don't myelinate them
peripheral neurons that have a larger axon usually have _____________
a typical myelin sheath (pieces of sheaths going down the axon that are interrupted by gaps called the nodes of ranvier)
peripheral neurons that have a larger axon usually have ________
a myelin sheath
nonmyelingating schwann cells provide some ____________ but they don't ________
1. support to some peripheral neuron axons that have a small diameter
2. myelinate them
what creates the myelin sheath in the peripheral nervous system?
what creates the myelin sheath in the CNS?
the function and structure of the myelin sheath in the PNS is the same as for the ____________
the function and structure of the myelin sheath in the CNS is the same as for the _____________
a big difference between the Schwann cells in the PNS and the oligodendrocytes in the CNS is that ___________________
a schwann cell can only produce the myelin sheath for one segment of only one axon. This means that it's not myelinating multiple neurons like oligodendrocytes do
how many segments of an axon can a schwann cell produce a myelin sheath for?
one segment of one axon
how many segments of an axon can a Oligodendrocyte produce a myelin sheath for?
what is the shell membrane of the schwann cell called?
myelin is very rich in __________
how is myelin wrapped around the axon?
very thinly and very tightly like a role of tape
for a schwann cell, almost the entirety of its membrane is the myelin that is wrapped around it except for _____________
a little lump on the outside, thats going to be sort of like a soma because it's going to have a nucleus and its going to have most of the cytoplasm of a schwann cell
what is a schwann cell composed of?
an axon that is very thinly and tightly by myelin.
what is the cell membrane of the schwann cell called?
shwann cells also appear to influence __________
neurons and vice versa through exchange of a variety of substances
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