unipolar neuron

(redirected from Pseudounipolar cell)

u·ni·po·lar neu·ron

a neuron with a cell body that emits a single axonal process resulting from the fusion of two polar processes during development; at a variable distance from the cell body, the process divides into a peripheral axon branch extending outward as a peripheral afferent (sensory) nerve fiber and a central axon branch that enters into synaptic contact with neurons in the spinal cord or brainstem. With the single known exception of the neurons composing the mesencephalic nucleus of the trigeminus, unipolar neurons are the exclusive neural elements of the sensory ganglia. The lack of dendritic processes of these primary sensory neurons is only apparent: the dendritic pole of the unipolar neuron is represented by the unmyelinated terminal ramifications of the peripheral axon branch.

u·ni·po·lar neu·ron

(yū'ni-pō'lăr nūr'on)
A neuron with a cell body that gives off a single axonal process resulting from the fusion of two polar processes during development; at a variable distance from the cell body, the process divides into a peripheral axon branch extending outward as a peripheral afferent (sensory) nerve fiber, and a central axon branch that enters into synaptic contact with neurons in the spinal cord or brainstem.

unipolar neuron

A neuron whose cell body bears one process.
See also: neuron