Wikia

Psychology Wiki

Gamma motor neurons

Talk0
34,141pages on
this wiki

Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Biological: Behavioural genetics · Evolutionary psychology · Neuroanatomy · Neurochemistry · Neuroendocrinology · Neuroscience · Psychoneuroimmunology · Physiological Psychology · Psychopharmacology (Index, Outline)


Gamma motor neurons
Gray642
Gamma motor neurons are derived from the basal plate (basal lamina) of the developing embryo.
Latin '
Gray's subject #190
System Central nervous system
MeSH A08.663.655.500.525
[[Image:|190px|center|]]

In the nervous system, gamma motor neurons (γ-MNs) are slow-conducting lower motor neurons that innervate intrafusal muscle fibers. They form part of the reflex circuit that underlies muscle spindles and are therefore an integral part of the sense of body position. These neurons synapse on the poles of the muscle spindles and cause contraction of the spindles so that they remain taught when the surrounding extrafusal fibers have contracted and would otherwise relieve tension on the spindles. This ensures the muscle's stretch reflex is always active. Gamma motor neuron activity also regulates how strongly the muscle responds to a given amount of stretch, thus allowing small changes in muscle length to cause large changes in muscle force.

ReferencesEdit

Around Wikia's network

Random Wiki