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Anatomy of a neuron | Human anatomy and physiology | Health & Medicine | Khan Academy

2681 ratings | 1128407 views
Neurons (or nerve cells) are specialized cells that transmit and receive electrical signals in the body. Neurons are composed of three main parts: dendrites, a cell body, and an axon. Signals are received through the dendrites, travel to the cell body, and continue down the axon until they reach the synapse (the communication point between two neurons). Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/nervous-system-introduction/v/overview-of-neuron-structure?utm_source=YT&utm_medium=Desc&utm_campaign=healthandmedicine Missed the previous lesson? https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/nervous-system-introduction/v/introduction-to-neural-cell-types?utm_source=YT&utm_medium=Desc&utm_campaign=healthandmedicine Health & Medicine on Khan Academy: No organ quite symbolizes love like the heart. One reason may be that your heart helps you live, by moving ~5 liters (1.3 gallons) of blood through almost 100,000 kilometers (62,000 miles) of blood vessels every single minute! It has to do this all day, everyday, without ever taking a vacation! Now that is true love. Learn about how the heart works, how blood flows through the heart, where the blood goes after it leaves the heart, and what your heart is doing when it makes the sound “Lub Dub.” About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Health & Medicine channel: https://www.youtube.com/channel/UC1RAowgA3q8Gl7exSWJuDEw?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
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Text Comments (185)
Christopher Gordon (1 day ago)
This is not bad at all i am learning a lot about math.
Ishan paul (4 months ago)
Sudden end😂😂😂😂😂
Ledi Ledi (5 months ago)
Nice information
Luna (6 months ago)
Dierek?????????????????????????????? sorry you sound like the voice actor for dierek/ein at aphmau's channel XD
4am Curiosity (9 months ago)
So thankful for your professional clear cut videos. Its 2am and i just wanna learn and you help me and im stoned so thanks.
Robert Bates (11 months ago)
what digital presentation tool is the presenter using?
Andromeda Gaming (1 year ago)
*ranvier = RON-vee-ay
Britany Cheung (1 year ago)
Wow, my bio teacher compares nothing to this channel. Oh my goodness. The videos are extremely helpful.
H Erraguntla (1 year ago)
salman khan i have a doubt what is the difference between neuron and a nerve cell are they same or different
Daniel Singery (8 months ago)
H Erraguntla it’s the same thing, but we say ‘neuron’ since we’re talking about the nervous system in general
Isai Ruiz (1 year ago)
neurolemmocyte
s gokul (1 year ago)
can you please specify about neurolemma.
Chung Hau Nguyen (1 year ago)
swear word aleart 0:34
Shannon Fernandes (1 year ago)
Chung Hau Nguyen nyc
Oscar Castaneda Munoz (2 years ago)
how does the neuron know when to fire?
benji aymond (1 year ago)
ocast evo sensory neurons can detect heat, pressure, light, etc. That causes signals to be sent to the Central Nervous System, ie your brain and spinal cord. many reflexes such as withdrawing your hand from a hot plate are processed in the spinal cord plexus and are not consciously voluntary. Your body can send a signal called an action potential to your muscles and cause them to contract and move in milliseconds!
Dimitra hnk (2 years ago)
It should be noted that upon talking about the anatomy, one should distinguish between the CNS (Central Nervous System) and the PNS (Peripheral Nervous System), since the CNS has the oligodendrocytes as an insulator wrapped around the axon, whereas the PNS has the Schwann cells. They both do more or less the same job, yet the structure is different. Of utmost importance is the fact that the Schwann cells are the only ones capable of axonal regeneration after damage in mammals, which explains why such process is only feasible on the PNS.
Farhana Haque (2 years ago)
i was thinking the same thing, most of my focus in on the CNS so it caught me off gaurd when he said schwann cells LOL
Hus M (2 years ago)
correcting sal? I like u u little devil xD
Dimitra hnk (2 years ago)
+SoulSpectrum  You're very welcome dear :) Not really, yet I use a textbook that our lecturer has reccommended, which I find it quite helpful, since it breaks everything down for you. Nice and neat, it's Pinel's Biopsychology. Even if you're not in psychology you can always have your textbook & presentations as a guide and try to look for other sources as well. Never rely solely on youtube or the internet. They are fantastic and provide lots of information, still they're not holistic and there are always bits been left out or mispresented. To me it works as a little revision, I get a general picture in my head of what I've learnt.
TechSpectrum (2 years ago)
Thanks for this information, is there a video or illustrations on it I can use for my study guide you've seen? thank ks.
Ramzan Akhtar (2 years ago)
Whether axons are covered by myelin or schawann cells
Ramzan Akhtar (2 years ago)
I know that much as well.😎
Abelha Pedras (2 years ago)
schwann cells are adjacent to axons, they produce the myelin which covers the axons. um. i'm not sure if the schwann cell's membrane is the thing that covers the axon... and it contains myelin in it? i think it might be that. but the first sentence is 100% true though
TheCrazyMango82 (2 years ago)
"Let me pick a better color" *continues to use the exact same shade of yellow*
Shahin Safazadeh (2 years ago)
How could one download these videos? It seems IDM doesn't work for it!
GameFreakDudes (2 years ago)
+Shahin Safazadeh Use Downloader Accelerator Plus.
FamilyGuyRockz2009 (2 years ago)
God o hate this part of anatomy. It's so boring lol but khan is amazing.
FamilyGuyRockz2009 (2 years ago)
+wukilla11 *you're
Dmt mind (2 years ago)
your boring not life change and evolve your consciousness god is manifesting for us all
johnmbarto (2 years ago)
Gandalf- Quickly Hobbits, we must now cross the Sheaths of Myelin and down into the Nodes of Ranvier. For therein resides the Lady of the Neurofilimantes, whose control of the Schwann we require.
James McGraw (1 year ago)
LEGIT I said something exactly like this as I watched it with my wife. WELL DONE!
MrGamerman001 (2 years ago)
So if you were to take the nucleus of a neuron, and replace the nucleus in a nuke with the nucleus of a neuron, and the bomb was detonated... Does that mean your mind was blown?
Abigail R (3 years ago)
R u sure it isn't just ur neurons telling u that they're the coolest cell?? ~~~~~
star_light (2 years ago)
lol nice one . it gets me confusing now ..
Tamara Knezevic (3 years ago)
A perfect story about neuron, I wish there is more videos with this subject. Another resource I also found useful for human anatomy body is Moorack Simple Anatomy Miracle - it will be on google if you need it.
Bobby Sanchez (3 years ago)
wow that is so cool i wish i was white 
f v (3 years ago)
how did they discover all this?
Daves Reality (7 months ago)
We chopped up ALOT of brains !
nanditha dinesh (11 months ago)
lollll!!
nanditha dinesh (11 months ago)
genius brains !!
Paul Garcia (1 year ago)
Science
Wisdom Teeth (3 years ago)
Lovely drawings and captivating voice i loved and understood the video  Thank you sooooo much long live khan academy<3
Joshua Arora (3 years ago)
khans academy youre great in teaching and i know it
Joshua Arora (3 years ago)
teach me more 
Joshua Arora (3 years ago)
thanks this helps me do my project khans academy is the best
Ptr Georgiev (3 years ago)
"Anatomy of a neuron" imo is a too broad term to deal with. There is a variety of neurons in the different parts of the CNS and PNS with differing morphological characteristics. Nevertheless, a very good basic explanation.
Your videos are so awesome!!!
GuineaPigGoddess1 (4 years ago)
Youre a great artist!
Connie Ann Carty (4 years ago)
Hi there. I am a teacher. What program do you use to film these videos? Thank you Connie
redbeheaded (3 years ago)
What equipment do you use to make your videos? Here's his response: I use Camtasia Recorder ($200) + SmoothDraw3(Free) + a Wacom Bamboo Tablet ($80) on a PC. I used to use ScreenVideoRecorder($20) and Microsoft Paint (Free).
Adriada Versaile (4 years ago)
your video's saved me... writing a biology test today and this was amazingly helpful
Jeffery Z (4 years ago)
I believe my Biology book is trying to make everything complicated, so the author can be seen as an intellectual. Students in introductory courses would learn much better with straight-forward teaching, like here. Thank you Salman!
rtyrty12 (1 year ago)
OR Ph.d, sorry.
rtyrty12 (1 year ago)
(yes I know you wrote this three years ago, I apologize if your mind has been changed). I think there is an agenda in educational facilities that desires to weed out the 'lazy/unscientific' minded people from important credentials like a doctorate of ph.D. But to be honest I think it's understandable as to why they do this. The population is growing rapidly, and there is more chance of scientific error if they just let any Tom Dick and Harry in any scientific field. BUT if you have a passion for what you're studying, then you'll work hard to understand what the textbook is implying in its material, it can be done! Get dictionaries, search multiple sources, chat with others in your class... There is no reason why you can't work on digesting 'complicated' study material. One day you might even be one of those very people who help publish such textbooks!
Adnan R. (3 years ago)
+Jeffery Zimbelman I've never thought of that. I think you're probably right, I bet alot of teachers do that. It's a shame.
Sofia Vaiopoulou (4 years ago)
It seems so simple comparing with the university books!!!Thank you!!!
Matina TheArtOfRolling (4 years ago)
language matters..english language doesn't use one thousand words to describe sth...and it's easy for you ( us :P ) cause the terms are mostly in greek.
LeAnna Lesmeister (4 years ago)
Wow! Amazing! Beautifully done--watching the illustration happen helps me visualize it more than just seeing the finished product. Great video!
Sean Ngui (4 years ago)
Did he just spell it as 'myelin sheaf'
LFindable (3 years ago)
+Sean Ngui haha he was just rushing through it
Nate Thomas (4 years ago)
I think he just forgot the "h." He was saying "sheath" properly as he described them. 
Connie Carty (4 years ago)
Thank you for you amazing videos. I am also a teacher. What format/program are you using for these videos? Connie Does anyone else know?
bevhinde (4 years ago)
The next vid is Sodium Potassium Pump 13:53 mins long. Enjoy :)
sebastian Ivey (4 years ago)
your a good drawer sal
Laura Lucy (4 years ago)
I can't find the end of this video. I looked in the biology playlist and I couldn't find a continuation anywhere, though there is a private video there, could that be it? Is there anyone who has a link to the rest of the video?
Phy Mei Liu (4 years ago)
Where can I find the video after this one?
Chris Sweeten (4 years ago)
Watch Later  Neuronal Synapses (Chemical)
Hallowtooth 187 (4 years ago)
:3
Jeppe (4 years ago)
Is this video continued somewhere, and is so can someone link it please. I cant find any myself. I missed some explanation of the difference between unipolar, pseudounipolar, bipolar and multipolar neurons. Great video though!
Jeppe (4 years ago)
Thanks :)
Armands Šlihte (4 years ago)
There is a playlist for biology, where the videos are sequenced. Naming of the videos is pretty bad for youtube ;)
Nahid Afroz (4 years ago)
thank you so much SAL <3
writing manthra (4 years ago)
Great...explained in easy way...
robertputneydrake (4 years ago)
WHOA, seriously, you sound pretty much like Frank Zappa from time to time.
Doomzdayxx (4 years ago)
☻/ This is Bob. /▌ He hates how everyone is copying him. Stop copying and pasting him all over. / \
Chris Sweeten (4 years ago)
+Cody111079 ikr ☻/ This is Bob. BOB 4 EVER /▌ He hates how everyone is complaining about people copying him. LOLZ   / \
Cody111079 (4 years ago)
Ironic.
Marina Duvall (4 years ago)
Sal, I love you, but it's pronounced 'Ron-vee-yay', not Ron-veer.
cherio28 (4 years ago)
You are the best thing that ever happened to education and me
TheSkarzone (4 years ago)
Wow. Superb vid. My dad was formerly a flabby. He improved his body from 290 lbs of fat to 203lbs of full-strength lean muscle mass. His pals were shocked. I just joined personally because I would like to greatly improve my entire physique. He made use of the Muscle Building Bible (Look in Google)...
Nelson Carbonell (5 years ago)
I can hear him teach all day long! I love his voice!
oxDessyxo (5 years ago)
thanks so much for this! im a visual learner and lectures are not very visual, this has helped me understand so much!
Aaron Ho (5 years ago)
Salman Khan = Asian Sheldon Cooper :)
Junie Exama (5 years ago)
lmao seriously!! I thought he only did chemistry.
Bijay G (5 years ago)
Full video? Where is it? *drools*
Aja Rangel (5 years ago)
I love your videos! You have helped me I understand complex subjects. Please make more videos on anatomy & physiology of the human body & the pathophysiology of diseases!! I am a RN student in need to clarification. Thanks again for all your great video!!
Linda Soto (5 years ago)
I love these videos! thank you! I get the material much better because of these videos!! :)
savannah beck (5 years ago)
I absolutely love this!!! studying is so much easier now :D
Tyler Howell (5 years ago)
neuron sounds g
Tyler Howell (5 years ago)
seems 2 know what he is saying big ass words
Cyryl (5 years ago)
tfw your neurons are learning about neurons
mercy areli (5 years ago)
Es muy útil para la enseñanza de mis alumnos. Les recomiendo.
Mexuverse San (5 years ago)
I would love to ask you a personal question. What is your opinion on Dr. Michio Kaku?
Matt Stewart (5 years ago)
I would pay extra to have this guy as my professor.... I would finally ace all my courses.
low-QUALITY crypto (5 years ago)
This nigga has to have the brain of god.
Deochan Mewalal (5 years ago)
Crash course / khanacamedy has the best videos !!
DJ Frequency (5 years ago)
Thumbs up if you got an exam tomarrow
DJ Frequency (5 years ago)
Yea he went to M.i.t
SiiKxR (5 years ago)
if i pass my A-levels it is because of this legendary man !
Paul W (5 years ago)
The end of this video seems like it was cut off early :'(
Triny Gutierrez (5 years ago)
The schwann cell is a type of glial cell. The schwann cell is in the PNS. There are are glial cells such as the astrocyte, which is in the CNS.
mormander (5 years ago)
yes
TheSawJigsaw (5 years ago)
My Five Top Cells: -Neuron -Erythrocyte -Natural Killer T Cell -Spermatozoon -Hepatocyte
Big Johnson (5 years ago)
Is there a difference in Schwann and glial cells?
KV Lin (5 years ago)
If you would bother to look through his next few videos... -.-
smilingqueen710 (5 years ago)
But the schwann's cells and the myelin sheath aren't the same thing ! the schwann's cell lyes over the myelin sheath which sourrounds the axon .
thelussier2013 (5 years ago)
Schwann cells myelinate axons only in the Peripheral Nervous system. In the Central Nervous system, Oligodendrocytes are the myelinators.
Saif ar Rahman (5 years ago)
Thanks, it was of great help :D
Abade (5 years ago)
You sound like Charlie the unicorn :D
MintCupcake (5 years ago)
In NZ its spelt neuron
texasbeu2y (5 years ago)
I am a visual learner and I understand..Good Job..
Malixie (5 years ago)
This was a very helpful video, thank-you. Does anyone know if there is a video that explains the transmission of a nerve signal using a ion gradient? Preferably Khan because the video's are clear but I am open to anything :)
Stefaan gooseburg (5 years ago)
is the behavior of neurons deterministic?
James Graham (5 years ago)
Next Video in Neuron Series: Sodium Potassium Pump:
Haruun Khalif (5 years ago)
great video mate explanation is good drawing really helped good work.
Hafizah Hoshni (5 years ago)
Thanks. You are awesome tutor ever !!! XD
qwert173qwert (5 years ago)
i love it when studying means kickin back and watching khan academy!
FrankieJ789 (5 years ago)
Very nice video!! i made a video explaining this also but on how it relates to behavior in psychology :)
rayf G (6 years ago)
its a blast one buddy!:)
robertwc82 (6 years ago)
yeah, but how are the nerves on the shoulders different to the ones in your fingers. what makes them have different weights?
Colin Baxter (6 years ago)
probably changes dramatical depending on the use of the nerve. those on the shoulders would need a lot more stimulation before doing any action, whereas those on the hands need very little. a nerve generally has a charge of -70 millivolts and can go up to +40 when an impulse is sent
robertwc82 (6 years ago)
im a complete layman when it comes to neuroscience or even cell biology (i have no formal education, didnt pass highschool lol) but all i want to know is, what physical properties determines how much input voltage turns the neuron "on". is it the ratio of positive ion gates, to negative ones? like, what sets the neuron's weight value?
Biology Bytes (6 years ago)
Like Biology? Check out my channel!
Tiff Lee (6 years ago)
guys... where's the next part?! :"(
Anna Gonzalez (6 years ago)
very organized, thanks it helped even more to see a video!!
Rahul (6 years ago)
Your comments are annoying.
Elise Bailey (6 years ago)
this is getting me through my university psychology course of brain and behaviour THANK YOUUUUUUUUUUUUUUUUUUUUU!!!! YOUR AMAZING :)
Luis Rodriguez (6 years ago)
I think you should fuck off. You do one.
Catalaayaa (6 years ago)
which video comes after this one? The name of the next video??

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