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.
afferent neuron, sensory neuron-a neuron conducting impulses inwards to the brain or spinal cord. nerve, nervus-any bundle of nerve fibers running to various organs and tissues of the body. afferent fiber, sensory fiber-a nerve fiber that carries impulses toward the central nervous system.oun. 1. afferent-a nerve that passes impulses from receptors toward or to the central nervous system. afferent nerve, sensory nerve. dorsal horn, dorsal root-one of the two roots of a spinal nerve that passes dorsally to the spinal cord and that consists of sensory fibers.