Muscle Spindle & Stretch Reflex || Knee Jerk Reflex

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Video Summary:
The muscle spindle is a sensory organ to sense the length of the muscle. It is made up of intrafusal fibers which are of two types: nuclear bag fibers and nuclear chain fibers. Their mid-portion is sensory and is innervated primarily by type Ia fiber. The ends are contractile and are innervated by gamma motor neurons. Upon sudden stretching of the muscle, the spindle sends a signal to the spinal cord. Here the sensory neuron directly stimulates the α motor neuron resulting in reflex contraction of the same muscle. This stretch reflex prevents sudden changes in muscle length.

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Chapters
00:00 Intro
00:15 Extrafusal vs Intrafusal Fibers
00:32 Muscle Spindle
01:15 Intrafusal Fibers
02:45 Nerve Supply
04:41 Stretch Reflex
06:31 Reciprocal Innervation
08:14 Summary

Dr Vipul Navadiya

DISCLAIMER: This video is for education purposes only. Although every effort is made to ensure the accuracy of the material, viewers should refer to the appropriate regulatory body/authorized websites, guidelines, and other suitable sources of information as deemed relevant and applicable. In view of the possibility of human error or changes in medical science, any person or organization involved in the preparation of this work accepts no responsibility for any errors or omissions, or results obtained from the use of information in this video.