Introduction to how reflexes work - reflex arc, monosynaptic and polysynaptic reflexes
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- เผยแพร่เมื่อ 1 มิ.ย. 2024
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"A reflex is a subconscious stimulus response mechanism. Clinically many reflexes are tested to identify any abnormalities in the reflex pathway which may indicate problems with the CNS or the PNS. Reflexes tested include superficial and deep tendon reflexes such as the triceps, biceps, brachioradialis, patellar and achilles reflex. What you are looking for in these reflexes are not the movement of the limbs but rather the contraction of the associated muscle.
A reflex involves sensory fibres delivering information to the CNS, and motor fibres carrying commands to the effectors via the PNS The reflex arc is the neural wiring of a single reflex and involves 5 steps"
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I'm learning a lot through your videos especially now during quarantine and our professors will be giving us exams despite not sending any lectures. Massive thanks for all your videos. It's a great help to a lot of struggling med students like me.
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The information on the upper motor neurons being excitatory or inhibitory makes so much sense as to why you get hyperreflexia and + Babinski sign. Thank you!
Just the best description and explanation of Reflex responses...ever ! Thanks
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This is a great video, I was stuck on the exact mechanism of the myotatic reflex and how the gamma motor neurons and alpha motor neurons were stimulated. This video made it as clear as day, truly remarkable how it can be made so simple yet my med school professors make it seem so complex smh. Thank you!
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At 7:22 the narrator says that "all synaptic reflexes involve interneurons". This is almost always the case, but not in the case of the stretch reflex which is a monosynaptic sensory --> motor synapse.
Steph Paoli I can’t understand something .. how stretch reflex is monosynapse when it has afferent that synapse with other efferent that inhibit the antagonist muscle ?
Thank you sir.
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The brain cells are just as reflexive to external stimuli as the parts of the body you've pointed out in this video. It is a chain reaction that has started before our birth and started with the very first organism.
thank you for teaching me when my A&P professor wouldn't :')
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Very very wonder lecture
Does anyone else hear what sounds like birds chirping in the background, or am I losing it?
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Sir, it'd be very helpful if can make a video on anatomy of female pelvis. Thank you.
Think about this: If you were to remove your ability to hear, then your sight, and then your ability to feel and then smell, what would your conscious experience be? Now imagine you were born that way (without any senses)... So now you have no senses and no idea of anything= no referential experience what so ever. What would that experience be? Our experience is dependent on our senses, and our faculties for sensing is all automatic= Reflexive. Reflexes are all electrical. Now extend this fact to every cell in your body: Billions of cells simultaneously reflex to give rise to the sensation of self and "consciousness".
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The 1 dislike did not graduate medical school
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why everything sounds easier when you explain it?! XD
Is there a way to get the full picture of what he drew?
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Around 13:30 - I still don't understand why the toes extend upwards - Yes, I get that due to pyramidal lesion / underdeveloped pyramidal system there will be no inhibitory message from the upper motor neuron, however, in the video it doesn't mention any excitatory message that is being transmitted to the extensor muscles of the feet / toes, so, why do they curl up? on top of that, we still have an excitatory message to the flexor muscles of the feet, so I don't understand how the babinski sign happens. I guess the actual response is much more complicated than the one given in the video? Anyway, great video regardless.
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What is e4 neuron in the patellar reflex arc ?
plz any one may explain....
question is
reflexes are conrolled by which part of nevous system
(A) pons
(B) cerebrum
(C) spine
(D) none of these