Info

Explain how nerve impulses are amplified.

11. Nervous System II: Divisions of the Nervous System nervous m II

Divisions of the Nervous System understanding ^Vo rds cephal-, head: encephalitis—

inflammation of the brain. chiasm-, cross: optic chiasma— X-shaped structure produced by the crossing over of optic nerve fibers. flacc-, flabby: flaccid paralysis— paralysis characterized by loss of tone in muscles innervated by damaged axons. funi-, small cord or fiber:

funiculus—major nerve tract or bundle of myelinated axons within the spinal cord. gangli-, swelling: ganglion—

mass of neuron cell bodies. mening-, membrane: meninges— membranous coverings of the brain and spinal cord. plex-, interweaving: choroid plexus—mass of specialized capillaries associated with spaces in the brain.

chapter objectivi

After you have studied this chapter, you should be able to

Describe the coverings of the brain and spinal cord. Describe the formation and function of cerebrospinal fluid. Describe the structure of the spinal cord and its major functions. Describe a reflex arc. Define reflex behavior.

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