NEU Lecture Notes - Lecture 2: Efferent Nerve Fiber, Afferent Nerve Fiber

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bk609518

21 Jan 2023

School

Stanford University

Department

Neurobiology

Course

NEU

Professor

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Document Summary

Although reticulospinal pathway for automatic breathing starts functioning (and hence myelinated) at birth, the entire myelination of the reticular system is completed only in the second decade (during adolescence. Firstly, the axon arising from an interneuron may be divided into a number of branches and may synapse with a number of efferent neurons. As a result, an impulse coming along a single afferent neuron may result in an effector response by a large number of efferent neurons. Secondly, afferent impulses brought by a number of afferent neurons may converge on a single efferent neuron through the agency of interneurons. Some of these impulses tend to induce activity in the efferent neuron (i. e. , they are facilitatory), while others tend to suppress activity (i. e. , they are inhibitory). Thirdly , through interneurons, an afferent neuron may establish contact with efferent neurons in the opposite half of the spinal cord or in a higher or lower segment of the cord.

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