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??? Chapter 16: The Nervous System
Pathways and Higher-Order Functions
5
Anatomy
Undergraduate 1
12/10/2011

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Term
sensation
Definition
when a stimulated receptor passes information to the CNS
Term
first order neuron
Definition
the sensory neuron that delivers the sensations to the CNS; its cell body is in a dorsal root ganglion or a cranial nerve ganglion
Term
second-order neuron
Definition
is an interneuron upon which the axon of the first-order neuron synapses; cell body may be located in  either the spinal cord or the brain stem
Term
third-order neuron
Definition
axon carries information from the thalamus to the appropriate sensory area of the cerebral cortex
Term
descussation
Definition
the cross over of the axon of either the first order or second order neuron across to the opposite side of the spinal cord or brain stem as it ascends
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