Ch.12 Exam review questions Flashcards
What is a nerve?
A bundle of axons in the PNS
What is a tract?
a bundle of axons in the CNS
What is a ganglion?
A cluster of cells in the PNS
What is a nucleus?
A cluster of cell bodies in the CNS
What are motor neurons attached to
mucles
What are sensory neurons attached to?
the spinal cord
What are the two divisions of the PNS?
motor and sensory
What is the function of a cell body?
It integrates information from the dendrites and other synaptic inputs in determining the messages to be transmitted to other cells through its axon.
What is the function is a dendrite?
Receive on input portions of a neuron
What is the function of an axon?
Propagates nerve impulses toward another neuron, a muscle fiber, or a gland cell.
Which neuroglia are in the CNS?
astrocytes, oligodendrocytes, microglia, and ependymal cells
Which neuroglia are in the PNS?
Schwann cells and satellite cells
What is the function of astrocytes?
help to maintain the appropriate chemical environment for the generation of nerve impulses
What is the function of oligodendrocytes?
Are responsible for forming and maintaining the myelin sheath around CNS axons.
What is the function of Microglial?
Functions as phagocytes
What is ependymal cells?
Produce cerebrospinal fluid, which protects and nourishes the brain and spinal cord
What is the function of Schwann cells?
Participates in axon regeneration and form the myelin sheath around axons
What is the function of satellite cells?
Provides structural support, and regulates the exchanges of materials between neuronal cell bodies and interstitial fluid
What type of ion channels are located in the axons?
leak channels and voltage-gates channel
