Muscle stretch reflex | Organ Systems | MCAT | Khan Academy

[@TheDeadlyBees]

THANK YOU. I'm studying for a neuroanatomy final, the Powerpoints for which are a confusing-ass mess, and now I actually understand how the stretch reflex works. Very clear and descriptive.

[@beyla8735]

Thanks so much! I've been reading and reading trying to find out what this stretch reflex is, but this had me understand in les than 10 minute!

[@Bhuji]

Etymology late Middle English: from French, from Latin , diminutive of ‘mouse’ (some muscles being thought to be mouse-like in form). early 16th century (as a noun denoting reflection): from Latin ‘a bending back’, from ‘bend back’ (see reflect).mid 19th century: from Latin ‘bringing towards’, from the verb , from ‘to’ + ‘bring’.mid 19th century: from Latin ‘carrying out’, from the verb , from ‘out’ + ‘carry’. late Middle English: shortening of Old French , or from Latin ‘thorn, prickle, backbone’.

[@Lukeee915]

Khan academy helped me get into dental school and now they still got my back!!

[@n_92alharbi71]

What do need stretch reflex for in dental school?

[@GauravSharma-hg2jj]

@@n_92alharbi71 same thing I was gonna ask him.

[@samanthadelacruz5832]

In our school, We have physiology that covers this one😂😂

[@silvertix2996]

Got me into med school Keeping me going while I’m here KUDOS! ❤️

[@jermainejguillory]

This was an AMAZING explanation of Gamma Loop activity. Thanks so much for this.

[@BZSPIRIT]

This is the most straightforward explanation on this subject that I could find. Thank you so much.

[@gahanasrinivas8810]

Finally I understand what's knee jerk

[@czicky]

your videos are amazing. I love the different colors and the clear, simple explanations!

[@anniealcantara9264]

ok you are awesome! thank you so much. After much reading on the subject i had nothing until i saw this video. you just helped my lab report grade :)

[@nickscurvy8635]

I'm just here to learn about my body and also understand why bouncing out of the hole on my squat makes it stronger. Thanks for the info :)

[@hannibalchaw1425]

u just earn one more fan, thank you a lot!

[@mermaidtale1]

This makes much more sense than our Lecturers

[@NathanDoyle11]

Great, thorough explanation. Subbed!

[@tgastrula6552]

Wow I never knew that the ventral region was above the dorsal sensory segment! Good job Khan!

[@Ibrahimo7md]

Thanks for the explanation 🔥😀

[@mariospiteri8561]

Very well and simple explanation..! You earned another you tuber...! I want to understand why sometimes i have some tingiling in my foot...!? About 10 years ago i felt down walking on a garage ramp hitting my horse tail. I feld a big pain in my lower back when i felt down hitting on the horse tail..! Do you think that the tingiling in my foot its because of this..?? I have never feld this before a 1 year ago...!! What do you think about this plsss..??🤔

[@1S1KNLJS]

10 years ago? And know you feel symptoms, unlikely but could be. But it is usually a sign from your body and should get it checked out as it can mean many things. Not a doctor though so idk 🤷‍♂️

[@leomasterking]

Can you describe how foot drop occurs with injury at the lower back?

[@sab9351]

Ackram Jin :an injury at the lower back would be located at the L4-L5 vertebrae most likely, these vertebrae/nerves are connected to the sacral plexus which controls most of the motor and sensory functions in the leg. Because of this an injury to the nerve can effect the ability to flex the foot, resulting in foot drop. Other symptoms of this injury may include loss of vibratory sensation and two point discrimination, and loss of ability to flex at the knee.

[@TorresD92]

Thank you sir

[@kabab1019]

Anyone else absolutely destroy their kneecaps trying to get the knee jerk while he was talking 😂

[@matijastrok127]

awesom. great job, thnx!

[@mqasimafridi9567]

U made my day sir💞

[@Keana43]

Told me all I need to know.

[@h.a3960]

that was so helpful

[@cristinaferri6457]

very simple and clear! Thank you very much!!

[@funtimes4145]

I was under the impression that in a reflex arc the afferent neuron connect to an interneuron in the spinal cord before connecting to an efferent neuron

[@coachsouvik]

From my understanding , when it's stretched or reflexed then you hit with a rubber hammer on knee cap tendon...It ll flex and contract.....Not stretched...You said stretched in the video...

[@Sarah-kg9zj]

AMAZING video

[@mariepreuer7208]

Thank you so much, you are a life safer! :)

[@jmjm3882]

Amazing 👏👏

[@hiahlam8067]

brilliant

[@Sevival]

You sound like Matthew Mcconaughey

[@akshan1107]

God bless!!!!

[@faheym1]

But this video still doesn't answer why Hyperreflexia occurs in MSR mechanism???

[@olympicfitness]

Faheem Haider to be honest I don't think that was their intention.

[@deepavelayutham6913]

Hyper reflexia can occur in an upper motor neuron lesion ..but here they s no involvement in UMN

[@whatrtheodds]

Thanks so so much! Subscribed!

[@harbautv]

Great

[@bothainah8420]

Thanks for the video. It's still confusing tho :(

[@SY-ni9lb]

which afferent and efferent nuerones are involved in the stretch refex?

[@jackieoneill838]

I have been getting jerks from my left leg for a few years, and I have not been to a doctor for this at all. Can anyone please let me know what it is because my full leg will go away from me as well at the same time, and force my self back up right then start to walk with pain and my leg even though I know that my leg is swelling up at the same time. I have had this for years and years.

[@ICatchTheStars]

Did you miss the patella tendon connecting the patella and the thigh muscle？

[@Nishamukherjee1995]

Thanks....sir

[@justinsantos9684]

wait i still dont get it. what does the stimulus exactly do to the system such that it is detected by the muscle spindle?

[@bendflikshteyn]

the stimulus (like the hammer) stretches the muscle. the sensory fibers of the muscle spindle are the afferent part of the reflex and pick up on this stretch. the motor neuron corrects for that stretch with contraction. tldr: stretch

[@MedicalNemesis]

what about hyperreflexia? Where is the physiological inhibition of the muscle reflex response that is lost in some CNS-pathologies?

[@TrainerHutch]

how fast does the muscle stretch reflex happen on avg.?

[@PropagatorNET]

Bassiest voice ever...

[@pithikoulis]

Isn't this guy the same who talks about the Mantis shrimp?

[@andhemills]

Would you be my neighbor?

[@Jungys95]

+Andy Mills Flanders from the Simpsons XD

[@Ha-be2hk]

looooooooooooooooooooove you

[@bm032ue9]

🙏

[@sandwitht6264]

Christopher Walken?!

[@makim.3924]

nothing about muscle spindle😅

[@makim.3924]

2 💓

[@Nikolay_Milenkov]

Why are there Bulgarian subtitles lol :D

[@nathanhorton8150]

put some gloves on!

[@bdog1g]

This video was very helpful, however I do have to correct you. There is no such thing as a lower leg. The leg is from your knee to your ankle. Anything above your knee to your hip is considered the Thigh.

[@ghassanauf8103]

this video is way overestimated , you did not even mention any neuron type in this reflex . ashamed video

[@antonioorr2547]

Gogirllove good fun ask iow tallme you yes saye itss talking narsevolume