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.
Chapter 2. 101. sensory neuron. A neuron that detects changes in the external or internal environment and sends information about these changes to the central nervous system. motor neuron. A neuron located within the central nervous system that controls the contraction of a muscle or the secretion of a gland.hapter 2. 101. sensory neuron. A neuron that detects changes in the external or internal environment and sends information about these changes to the central nervous system. motor neuron. A neuron located within the central nervous system that controls the contraction of a muscle or the secretion of a gland.