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 (or afferent) neuron â a neuron sending nerve impulses toward the CNS; motor (or efferent) neuron â a neuron sending nerve impulses away from the CNS to muscles or glands; interneuron â a neuron sending impulses to another neuron; Word origin: Greek neÃ»ron (sinew, cord, nerve) Variant(s): neurone (British) Synonym(s): nerve cell; Related term(s):