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| 91. | thermoreceptor | type of sensory receptor capable of transducing temperature stimuli into neural action potentials |
| 92. | threshold | membrane voltage at which an action potential is initiated |
| 93. | tract | bundle of axons in the central nervous system having the same function and point of origin |
| 94. | unipolar | shape of a neuron which has only one process that includes both the axon and dendrite |
| 95. | upper motor neuron | first neuron in the motor command pathway with its cell body in the cerebral cortex that synapses on the lower motor neuron in the spinal cord |
| 96. | ventricle | central cavity within the brain where CSF is produced and circulates |
| 97. | voltage-gated channel | ion channel that opens because of a change in the charge distributed across the membrane where it is located |
| 98. | white matter | regions of the nervous system containing mostly myelinated axons, making the tissue appear white because of the high lipid content of myelin |
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