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.

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[@kindred3259]

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[@jeenasapkota4110]

Nuclear bag fiber and nu chain are the type of extrafusal fibers right? It’s in roams.

[@NonstopNeuron]

They are types of intrafusal fibers.

[@hesham-wu9ql]

Can u explain the reflex action when there is sudden decrese in length of muscle. Stretch means to lengthen not to decrease. According to ur lecture if 1a fibres stimulate alpha motor neuron of same muscle fibers then they cause muscle contraction. How come they cause relaxation as u mentioned it just by a sentence and escaped from explaining (6:19)

[@NonstopNeuron]

upon decrease in muscle length, the signanling from 1a fibers decreases, so without stimulation of alpha fibers, the muscle relax.

[@prachitaarora6784]

Hey when are gamma motor neuron is stimulated

[@NonstopNeuron]

Along with alpha motor neuron. Watch this video for more detail: kzbin.info/www/bejne/hJe7o4ulobyee9k

[@EasyPeasyLe]

When does the intrafusal muscle contract ?

[@NonstopNeuron]

Watch the video on alpha Gamma coactivation.

[@itsmezara5766]

🥰

[@houriak848]

Hello pls i can't get a point: i can't understand how the contraction of peripheral part of intrafusal fiber lead to stretch of muscle spindle? Cuz i can't imagine it if the peripheral part gonna contract this will lead to central part contraction

[@NonstopNeuron]

It's like two people pulling both hands from opposite ends. It will stretch you.

[@houriak848]

@@NonstopNeuron ahh so the direction of contraction is from inside to peripheral this way it will be shortened and the central part stretch

[@NonstopNeuron]

Yup.