Academy of Doctors of Audiology. Advanced Beneficiary Notice FAQ. The Advanced Beneficiary Notice of Noncoverage (ABN) is a Medicare document that is used to notify Medicare beneficiaries of their potential financial responsibilities prior to the rendering of a service or the dispensing of an item.
primary sensory neuron. A sensory neuron that is the first in an afferent pathway, beginning at the receptor and ending at a synapse with a secondary sensory neuron, often within a nucleus of the central nervous system. One common type is the pseudounipolar neuron. 1  pseudounipolar neuron.  secondary sensory neuron.
Sensory Neurons: Cell body of the sensory neuron is situated in the dorsal root ganglion of the spinal cord, and no dendrites are found in it. Motor Neurons: Cell body of the motor neuron situated in the ventral root ganglion of the spinal cord and consists of dendrites.