Neurology | Spinal Cord: Stretch Reflex | Muscle Spindle 

Some heroes don’t wear capes. You are a superstar, Zac. Thank you for making me pass physiology, med school would be considerably harder without you!

Your neurology play list makes me stay ahead of my class. Much love zach

I'm 3rd year med studet and your videos are very helpful. Every good medical material is paid and many student can't afford it. So thank you, and please don't give up🧑‍⚕️🩺

Hey Zach. In your older videos you used to put the entire whiteboard on the screen for a couple seconds at the end of the video. It really helped for revision. Can you start doing that again please?

I don't know what I'd do without your lecture videos! I will never find a better teacher than Zach! Thanks a lot for your efforts! 🙏🙇🏻‍♀️

Whenever my physiology gets hard, the first thing my mind tells me is,"go watch a ninja nerd video!".... Thank you so so so much for explaining quite well in every video... Your videos make learning way less stressful... Thank you Zach

your an amazing human for how your helping us med students , alot of med unis never bother to upload decent slides or lectures to explain anything so thank you for what your doing to help us students become what we want to be

I would have been so ahead of my professors and class if i had found this channel earlier Much love Zach❤ keep up the great work

What can i say man. Love the way you are dedicated to teaching us. Literally saving me from mental breakdown. ❤

I’ve been starring my notes for hours til i found this. Thank youuuu

You are so gifted to be this clear by explaining things. I found your videos so helpful. Such a great job 👏

Thank you so much for these lectures. Im in medical school right now and I use these lectures to better understand whats written on my very very complicated Physiology textbook. Cant stress it enough, THANK YOU 💯

I love your passion for the content as it allows a guy like me who is ADHD grasp such high yield info in fun way! I will never forget the alpha-gamma-coactivation because I know when those nuclear bag muscle fiber endings contract those Type I-A sensory neurons are activated because, "they tight baby!"

Beautifully explained, as always Zach. You're a life-saver!

"Sodium will be like "Uh-uh baby, I'm coming in!" 🤣 You made my day! Thank you!

Thank-you! I have watched a lot of your videos and they immensely helpful with a touch of humour. I know some doctors teach so imagine you will be teaching at a university if not already. Your videos are medicine as they help me to understand which relieves exam stress and lowers blood pressure. :) The world needs more people like you.

Finally this video cleared my concept of stretch reflex that was bothering me a lot , love and respect from my side 🙏

Right on time for my MSK/Neuro test. You're the man ❤️

YES! This was the best video I've found that explains these fibers in a complete way! TY!

you are just amazing in making complex stuff so clear and understandable!!! out of this world!

I just need to send you some love ❤️ This channel makes information so easy to digest and consolidate!

i literally bow down to you because of your educational videos. you are helping me so much through university right now

Such a great video! Thank you for making multi-modal learning accessible to everyone. I wish my Professors lectured the way you do!

Extrafusal fibers- Connect with tendon Generate movement. Intrafusal fibers- Proprioreception Length and velocity. Nuclear bag fibers- Length and velocity Type1 a fibers Annulospiral ending. Nuclear chain fibers- Length Type 1a and type2 a Flower spray endings Nuclear bag- Mechanical gated ion chhanel Voltage gated ion chhanel. Deep tendon reflex- Muscle spindle/ intrafusal fibers Type1 and type2 a Drg Motor neuron Muscle contract Ipsilateral monosynaptic reflex. Muscle spindle Drg Sensory neuron Interneuron INHIBITORY Inhibit motor neuron Inhibt skeletal muscles. Poly synaptic neuron. Reciprocal inhibitions Corticospinal tract INHIBIT gamma motor neuron.umn lesions Hyperactive Hypertonus Spacticity. Alpha gamma coactivation. Thank you sir

Thanks for restoring back the student in me.. your neurology videos are Soo firee🔥🔥

It took me hours to read and reread the chapter in my book and still don't understand. Thank God I found this video. Everything is clear now. ^u^

You videos are really helping me go through my Physiotherapie education. Really great explanations. Thank you!

I'm seriously so stunned you don't get 300k+ views per video. Damn algorithm! This is definitely the most top quality and simply explained info I've seen.

Thank You so much, Zach!!! So interesting and so understandably! So happy I've discovered your channel!!!

Thank you for existing!!...you make it so easier to study❤

Amazing explanation! I literally got to understand this materials for the first time.

I´ve been struggling with physiology the whole semester and you saved me. Thank you so so much for your videos!

Good to see you guys again. Your videos help me alot during quarantine. Thank you for beautiful lectures. ♥

I am so happy that you added neurology playlist when i am taking it 💗💗😍

This is so helpful!! I have an exam tomorrow and I was confused about this topic. Thank you for your clear explanation, especially about alpha-gamma co-activation!

Useful for my neurophysiology lessons at medschool. Thanks so much.

Been waiting for videos on reflexes!! Thank you!! 🥺❤

On point with my syllabus. Much love ❤️

wow this is not an easy concept to wrap your mind around! you make it bearable! thanks so much!

You are my hero! All your videos are so detailed and easy to understand! The best!!!!! Seriously the BEST!!!

Haven't seen it yet but I'm sure it's awesome! Gonna watch it later after your playlist on Respiratory. thank you sooo much!!!! xoxo

wow, quarantine lookin' good on this guy.

Thanks Ninja Nerd! You explain science far better than any of our professors!

Finally got the concept . Thank u zach ! Lecture was ultra pro max awesome 👏.

Helps a lot, that's dedication right there!😌. Appreciate it ! much love and respect for teacher zach.

Thank u soo much Zach!!!!!!.... U are indeed a saviour to all of us!!!! As I'm running short of time, needed to grasp all this concept, and I was able to do only with ur help!! Means a lot man!! U always rock 🤘and ur team too... 😇😎🤩

You are always the best! I shall request a video about concussion. I will greatly appreciate if you could explain what happens to brain tissue, and why such symptoms happens, as you explain with anatomy and physiology of brain.

Thank you for your lectures. I get to smile while studying.

As always, you are super talented Zach!! BIG THANKS man,,

I've just got here. I'm from Kenya. I'm ancient...63! Because I never had a chance I always felt I missed out on school. You guys are brilliant. I love this video. It has really helped me feel brave about learning.🙏🏽 From my heart

His neurology list makes me great in neurophysiology.🥰 I got 98 in neurophysiology thanks a lot Zach😊

looking for an hour in book...did nt got anything and here got satisfied in 30 min..😍☺🤗🤗🤗🤗🤗

Too clear and easy to get !! All thanks to you ❤ my Gof bless you😍

idk you're like my big bro who always has my back in med school thanks for doing what you do. you're awesome!

there is no one on youtube (or even my university) with the level of clarity and knowledge that you provide man, you are the GOAT greetings from argentina

i can't imagine how a Med student's life would be without you!!!! tysm 💛

So thankful for your lectures!

thanks bro! now i'm capturing everything just because of your help. Thanks indeed.

Finally got the concept of muscle spindles thank you

I can't explain my happiness that I'm leaning so much. Thank you

Super clear! Thank you!

Thanks Zac. This is life saving

i hit the like bottom before watching your videos you're doing an amazing job here thank you so much ! you are always a source of inspiration for me keep going !

I love you Zach❤️...wanna hug you😭😭, your videos are so awesome, as always

Another improvement that Allah does exist, and he is the best creater and the best one planning

Much needed topic. Thanks a lot!!

Ninja motivated me to start my own channel. Love you bro ❤️

YOU ARE THE KING of NINJAS !

this is an artwork thanks a lot ninja nerd staff

You are an excellent teacher! Thank you!

Wouldn’t pass neurophysiology without you. Thanks!!

Much appreciated! At least one topic for my neuro exam will be ninja'd :P

Such an amazing way of imparting knowledge. Keep going.

Iiiii looooove youuuuuuuu guys ..Teacher Zach! you're my Angle my Herooooo ❤️❤️❤️

Awesome way of teaching 🔥

Spinal cord reflexes are simple behaviors produced by central nervous system (CNS) pathways that lie entirely within the spinal cord. The sensory afferent fibers that evoke these reflexes enter the spinal cord and activate spinal motor neurons directly or through a chain of one or more spinal interneurons.👍

i wish i had accessed to your vdo during my med school years .... i had to read several pages in ganong and still could understand the concept at that time. Thanks bro .

I appreciate you guys so much !! your videos are great

Thank you for existing

thank you ,you make it so easier to study❤

Just at your time!! Thank You man!

Thank you sir ❤️ wonderful insight of knowledge

Your videos are very helpful! Thank you!!!

You’re the best as always you made it very clear I hope if you can start doing step1 Usmle lectures .

Damnnnn I have been studying this topic for past few days but hardly understood something . You made me understand the topic , thank you man

wow!!! bro, you have lost so much weight!! that is amazing!! congrats and of course great video as always :D

This is amazing! Thank you

Explained nicely ...made all facts easy to understand

Thank you for a well explained video!

So awesome teacher......all my concepts got crystal clear......

Literally sooo helpful 🙇🏻‍♀️

Thank you so much. This is great!

this is so helpful. Thank you so much!

Thank You Zach

Damn, this is a really well-explained video. Excellent content! Subbed

Fascinating !

Legendary video, thank you so much!!

Omg, I loved your explanation.

I really like the way you explain with the drawings and evrythinh it's really fun to listen to your video :)

So amazing video. Thank you