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34 Cards in this Set

  • Front
  • Back
Two basic cell types in the nervous system
Neurons and glial cells
neuron cell bodies are also known as
soma, and parikaryon
functions of the soma include
metabolic center of cell
signal reception
local signal propagation
production of proteins and other molecules
Axon hillock is the:
junction of the cell body and the axon
dendritic spines are also known as
2 primary actions of axons are signal ____ and ____
signal propagation and signal transmission
Axonal transport moves
organelles, macromolecules, etc. between the cell body and regions of the axon
anterograde transport means movement from
the cell body to the termination of the axon
retrograde transport means movement from
the axon terminal to the cell body
AP generation occurs in the axon
axon hillock
Axon terminal branches into the
terminal arbor
Myelin is produced by ___ in the CNS and ___ in the PNS
oligodenrocytes in the Central Nervous System and Schwann cells in the Peripheral nervous system
myelin results in an increases:
and conserves:
conduction velocity of AP
metabolic energy
Nodes of Ranvier are regions without _____
There is a high concentration of ___ at the Nodes of Ranvier
Na channels
The propagation of an AP occurs at
the Nodes of Ranvier
An internode is
the part of the axon covered in myelin between the nodes of ranvier
Unmyelinated nerve fibers in the PNS are usually
ensheathed by Schwann cells
Unmyelinated nerve fibers in the CNS may be
covered by processes of astocytes, but are generally not ensheathed
Input from other neurons synapses on these two parts of the second neuron
the dendrites and cell body
The local change in membrane potential is known as
receptor potential
Inputs from other neurons produce a:
receptor potential in the next neuron
The receptor potential/local change in membrane potential could cause
an action potential if it is of sufficient magnitude
Bipolar and pseudounipolar neurons have this function
Cell bodies of bipolar and pseudounipolar neurons are located in
the Posterior (Peripheral) root ganglia and the Central root ganglia
Sensory neurons (bipolar and pseudounipolar) do not have axons. what do they have?
Proximal and distal processes
Efferent neurons innervate
muscles and glands
Interneurons are always ____-polar
Oligodendrocytes have this function
produce myelin
astrocytes have this function
maintain the general environment and communicate with neurons
Microglia have this function
Ependymal cells line
the ventricles
Satellite cells are in the ___ and do this:
are specialized Schwann cells that surround the neuronal body
ended at slide:
24, 1st ppt in the class