Nervous System Cells
Terms in this set (22)
What are the two general cell types of the nervous system?
Neurons & neuroglia
What are the 6 types of neuroglia in the nervous system?
Astrocytes, oligodendrocytes, microglia, ependymal cells, Schwann cells, & satellite cells
Which neuroglial cells types are found in the CNS?
Astrocytes, oligodendrocytes, microglia, & ependymal cells
Which neuroglial cells types are found in the PNS?
Schwann cells & satellite cells
Function of an astrocyte
To keep neurons in place
Function of an oligodendrocyte
To form the myelin sheaths around axons
Function of a microglial cell
To eat up debris and dead tissue
Function of an ependymal cell
To form the cerebrospinal fluid
Function of a Schwann cell
To form the myelin around one axon
Function of a satellite cell
To surround sensory cell bodies
Function of an axon
To transmit information to other neurons
Function of dendrites
To receive information
What is the axon hillock?
The triangular initial portion of the axon
Function of the axon hillock
To help determine if the action potential is strong enough to send
Function of a myelin sheath
To insulate the axon
What are the nodes of Ranvier?
The points on the axon between the myelin
What defines a unipolar neuron?
It has only one process (axon) leading to and from the soma
What defines a bipolar neuron?
It has two process (one axon, one dendrite) on both sides of the soma
What defines a multipolar neuron?
It has numerous processes (one axon, many dendrites)
What are the three structural classifications of neurons?
Unipolar, bipolar, or multipolar
What are the three functional classifications of neurons?
Sensory (afferent) neurons, interneurons, & motor (efferent) neurons
What defines a sensory neuron?
It conducts signals from receptors to the CNS. It is typically unipolar.