Peripheral Nervous System: Crash Course Anatomy & Physiology #12
It is now time to meet the system that helps your brain stay in touch with the outside world. We follow up last week's tour of the central nervous system with a look at your peripheral nervous system, its afferent and efferent divisions, how it processes information, the reflex arc, and what your brain has to say about pain.
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/2SrDulJ
Chapters:
Introduction: Peripheral Nervous System 00:00
Sensory Nerve Receptors: Thermoreceptors, Photoreceptors, Chemoreceptors, Mechanoreceptors, and Nociceptors 0:56
What is Pain? 1:54
How Pain is Processed 2:51
Pain Threshold vs Pain Tolerance 3:50
How the Brain Processes Pain 4:25
Afferent and Efferent Divisions 5:42
Five Steps of the Reflex Arc 6:38
What the Brain Says About Pain 8:09
Review 9:09
Credits 9:39
***
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Пікірлер: 554
Honestly wish Hank was my anatomy and physiology professor. I might actually understand it.
@catholicdoula
6 жыл бұрын
Yeah, me too -- i am taking an online class and she just has us read the book, take quizzes and her quizzes are not easy.
@sztrebor843
6 жыл бұрын
I have spent months investigating reducing neuropathy at home and found an awesome website at Gabs Neuro Guide (google it if you are interested)
@LouiseAndria1
6 жыл бұрын
Me too!!! He would be the most amazing professor!!
@HialeahFlorida
6 жыл бұрын
He has writers. All he has is a very great personality.
@johnclhugyugihjbvgbkj9729
5 жыл бұрын
Jorge Ramirez I doubt that. I’m sure he knows a lot and contributes. 🙄 and he has the look and speaking-skills and etc.
"Well at least it wasn't a lego brick"-Frontal Cortex
@hufflepunk9562
7 жыл бұрын
Best comment.
@UNSCPILOT
6 жыл бұрын
10/10 made my day
@lameking2839
6 жыл бұрын
No it was a lego just retextured 😎
@giladbar7237
5 жыл бұрын
My brain’s parietal section approves this message
@nizamkhan5060
5 жыл бұрын
hey bro
Thank you, CrashCourse, for helping me further my education as a 30-something year old. All I remember of science in high school was all the terms we defined. Sadly, there were no discussions or labs - thanks in large part to all the miscreants in my school. However, the ability to learn and understand and apply the knowledge I am gaining from these videos (including the other science videos) and the books I've obtained, I am feeling confident in my pursuit of a medical degree. You guys rock :)
@i.t9390
5 жыл бұрын
Hope you are still going strong
@mizzobjectiveone3819
4 жыл бұрын
I'm right there with you! I hope yours still in school or close to graduating!
Receptors having those specific names is hilarious to me like sure "thermo" for heat, "chemo" for chemical "mechano" for pressure and "photo" for light make perfect sense but then just "NO!" for pain. The lizard brain named that one 😂😂😂
I'm finding these videos amazing for my study, I do university level anatomy a physiology and paramedicine. and sometimes when the content get really intense it's so helpful to take a step back from the insanely hard content do some fun revision of the basics and then try the insanely hard stuff. Thanks crash course.
Some say he's still stepping on that nail...
@lameking2839
6 жыл бұрын
Late call.....
I think it's incredible we live in a world where people are making stuff like this, not only is this more detailed than the stuff I learnt at school, but it presents it in a way that's fun and intuitive, so cool!
I wish this guy was my lecturer!! My brain seems to love everything he says!!
@jacekyle3131
5 жыл бұрын
probably true
Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ
I’m studying for my Physiology exam (veterinary medicine) and this channel and Hank talking have been really helping me. Thank you so much
The foot bouncing on the needle was sooooooo painful to watch...
@auregamer5
9 жыл бұрын
Etion Pinaristill not as bad as kzread.info/dash/bejne/ZKFow4-bnJfHnNI.htmlm32s
@Thumbsupurbum
9 жыл бұрын
auregamer5 Oh phew, I was expecting something far worse when I clicked on that.
@Eric_D_6
9 жыл бұрын
Etion Pinari yeah, that really didn't need to be animated for so long auregamer5 Even though I'd seen it before I ended up watching the entire first sketch
@ooooneeee
9 жыл бұрын
Etion Pinari Yeah, I had to censor it with my hand to be able to keep watching :(.
@SherissaDancer
8 жыл бұрын
+Etion Pinari That was extremely painful to me
Reflexive actions can be a bitch. A friend of mine was trying to pick something up between two hot stoves. His hand touched the left one, and his reflex told him to pull his hand away- right, into the other one. He bounced between the two at least four or five times before his higher functions made him pull back rather than sideways.
@NickSheridanVids
9 жыл бұрын
Yeah I know, #CoolStoryBro
@NickSheridanVids
8 жыл бұрын
+Eugene InLaw It was on a small boat, where the stoves were singular units and built into the architecture of the boat itself. Although he wins no points for sticking his hand down there in the first place..
@NickSheridanVids
8 жыл бұрын
It was, it really was. Thankfully he scuppered it soon after and lives in a much more modernised, stable boat now.
@discordant8543
7 жыл бұрын
VidSheridan He should sue
@theshaunsta
6 жыл бұрын
NickSheridanVids not really a fault of the reflexive nerves but rather a bad placement of those stoves
this man helped me understand everything i read while studying for the HESI exam. THANK YOU
WHY WHY DID YOU HAVE IT ANIMATED TO CONSTANTLY KEEP STEPPING ON IT WHYYYYYYY
@ahsanarifeen7827
7 жыл бұрын
I'm glad nobody does that in real life
@happyanyland4627
4 жыл бұрын
hahahaha
Personal trainer in training.....i am 100% grateful that i stumbled upon your channel! We need more teachers like you :) You make learning fun :)
"assure your dog you're not yelling at her, you're just yelling" I've had to do this before.
1:20 Nociception. I'll be using that from now on.
Thank you, Hank Green and all of the Crash Course peoples! Love these educational and entertaining videos.
crashcourse math subjects would be awesome. thanks.
You could say Hank really struck a nerve with this one!
@lameking2839
6 жыл бұрын
Srysly....
@lameking2839
4 жыл бұрын
@Razzle Dazzle Did you really get this after 1 yr? You are the chosen one , I have waited for a year now
@lameking2839
4 жыл бұрын
@Razzle Dazzle Nope your not the chosen one , Sorry kiddo
Crash Course, you guys are absolute life savors! I understand everything I watch from these videos! With a terrible teacher who, well, can't teach; these really help me pass his test!!
This is the best youtube channel ever! This is helping me study for my upcoming physiology exam tomorrow!
CrashCourse guy is the best!
@chocolatez9042
7 жыл бұрын
His name is hank
Oh my!!! Thank you soooo much for uploading this!!!😭😭 I have a test on this for my ap bio class tomorrow!!!!
@crashcourse
9 жыл бұрын
Ricky Lin Woo! You're welcome! I hope you rock that exam! -Nicole
@bluetannery1527
9 жыл бұрын
Did you pass?!
@JBoyle-jr9wb
9 жыл бұрын
CrashCourse these videos are great when you have an exam coming up, am tired of studying, and want to relax and watch a little tv. Thanks for all the uploads!!! You guys are awesome!!! I too have an exam soon which includes the nervous system. These are very helpful.
@valerykaravasilev6397
9 жыл бұрын
Ricky Lin Are you searching for the optimal peripheral nerve treatment. If yes, then you should the new drug called Skyarza Neuropathy Treatment Star . I beg you also to search the google for it. Reply ·
These videos are incredible, and make learning biology a real, entertaining, funny breeze. Thanks to all those who produced this video
I never comment on videos but I literally lost it when you described stepping on a tack. Assuring your dog you aren't yelling at her. LOL! Removing the spiney devil from your flesh. HAHAHA! Great videos by the way! You are AMAZING! Can't thank you enough for the much needed jokes while studying. Stay silly CrashCourseGuy!
Every time I read one of the titles for this subject, I always think "Aww, no need to be nervous System, everything will be fine."
Love this channel!! It has made A&P so much easier!! Please do a Pharmacology Series!! Please Please Please
Pain isn't subjective, suffering is. Pain is always sensed, but the proceeding reactions and emotional connections may vary from individual; whether from instinct or conditioning. Naturally speaking: The goal of pain is to entice suffering. The goal of suffering is to entice fear. The goal of fear is to elude death.
@TheSignetGamer
9 жыл бұрын
ShadowMantis702 Pain is the amount of activated cells mixed with your brain's reaction to said event, the reaction for the brain differs from person to person. Think of it as activated neurons + brain reaction = pain
@ShadowMantis702
9 жыл бұрын
TheSignetGamer I believe there is a Buddhist saying: "Everyone feels pain, but not everyone suffers." I feel it is more precise to make the distinction between pain (sensation) and suffering (reaction). The signals sent from the nervous system's receptors has already dictated danger, igniting the sensation distinct from fair touch. The following appropriate reaction is to suffer from that feeling. Pain = Damage sensory detection Suffering = Consistent distress to entice the desire for repair To suffer is the default, suffering makes you care about the pain. However this can be different or change. That fact that it can, I think verifies its distinction. Because if they were the same, we'd be condemned to always submit; nor could we discover pain deviants.
@TheSignetGamer
9 жыл бұрын
true words
@ShaudaySmith
7 жыл бұрын
Fear leads to Anger. Anger leads to Hate. Hate leads to Suffering. I sense much fear from stepping on that stupid tack.
@ethanchaney1139
6 жыл бұрын
ShadowMantis702 Thanks for the philosophy lesson. Fr tho, some people do have a higher pain tolerance, all philosophy aside, with what they consider worth being upset about, or in your case you say it’s suffering. If I get hit in the guy I can withstand it, 1. Bc I got used to it 2. Bc of my getting used to that other painful things don’t seem so painful. Yeah some people can deal with it better, pain can be if you take out the distinctions between stuff bc of your own personal philosophy on it.
You are an amazing teacher!
I love learning anat and phys! I didn't get to do any at university despite doing a biology based degree. Thanks for being awesome Crash Course. PS- finally got around to signing up for Patreon, there are some great perks there if you haven't looked into it yet!
Perfect timing for my exam in two days haha
@crashcourse
9 жыл бұрын
***** Wooo! Love when that happens :) Happy studying! -Nicole
@md.abswaruddinfahad8734
9 жыл бұрын
***** I like your video, especially the advice in the second half concerning peripheral treatment. i really like your thought also but i personally recommend Knewreck prevent neuropathy guide for better result . Please Google it for more information
@CXHo-sy1xz
4 жыл бұрын
Laura Hershel how’d it turn out XD
I love Hank's hypothetical situations. They remind me of his probability word problems on vlogbrothers.
I remember in 6th grade we learned about this and the short name is PNS every time she said that we would laugh
@yogitabhardwaj490
9 жыл бұрын
we laughed on PNS and ANS ;)
@tou7331
8 жыл бұрын
LMAO!!!!
@diegoav974
6 жыл бұрын
I can think of ways how and why...
@lameking2839
6 жыл бұрын
| 0|0
@billthewillgates1270
5 жыл бұрын
You were learning about this in 6th grade wtf?
Hank. I had a brain hemorrhage 2 yrs ago and your videos help me understand difficult topics and as a result i can make progress and although i may never be "normal" again. You help arm me with information i use in my rehab
Who would like Crash Course Meteorology?
@crazysquirrel879
9 жыл бұрын
So sad seeing this seeing a poor guy talking to hi. Self due to his lonnlieness
@achallengedclone9386
9 жыл бұрын
So sad to see someone who spells hi instead of his....
@kimoraanderson6378
9 жыл бұрын
Bob Jenkins They also said 'seeing' twice, and "lonnlieness."
@kimoraanderson6378
9 жыл бұрын
***** If you're looking for an argument, so sorry to disappoint. I have better things to do.
@sirBrouwer
9 жыл бұрын
for those kinda stuff I would suggest you to take a look at there sister chanel SciShow Space there you will find more likely stuff like Meteorology. It's a cool chanel anyhow.
When I was 4, I accidentally cut off my finger. Since then, pain didn't feel as bad as it did before and it still doesn't.
I truly love CC... I wish to be an interpreter someday, and I would dearly love to specialize in medical interpretation and cultural mediation. CC helps me to improve my scientific vocabulary to a great extent
I am Autistic and struggle to feel pain sometimes - when busy, i may not notice stepping on lego, but when overstimulated, my brain overreacts to pain and i feel the stepping on lego greatly.
Hey. I understand ten minute time limit. But slow down.
@boweny6230
4 жыл бұрын
You can try changing the speed from the "setting" button. I've been using 0.75 : )
Thanks Crash course, you make A&P very enjoyable and far easier to understand than my dreaded textbooks. Well done to another great vid. :)
Watching these videos makes me painfully aware of my strangeled nerv in my right leg. What is kinda awesome that, if you feed your brain with other random stuff (And painkiller) you can subdue the pain to a degree. But as soon you dive into thinking about it in detail you don`t only feel the pain but can feel it even in more detail as more you know about it. I think that is amazing and baffels me everytime.
Animation team working really hard to make you literally feel the pain they're trying to visualize.
i adore you CrashCourse team , thanks to all the patreons that make this possible, i will support the show too& Hank i love your way of presenting scintific topics, you re awesome!
I wish my teacher is like this . Like she just give us pop quiz and give us certain things we have to study . Although it seems like the things we studied aren’t in the exams like bruh very annoying
Thank you for these informative crash courses! Have honestly helped me understand brain behaviour so much better than my actual tutor. Keep up the good work!
I do not know what to do without crash course!!! They life savers ❤
Thanks Crash Course! You make learning awesome :)
what about phantom limb syndrome, or chronic pain after whatever caused the pain is healed, and neuropathy? please do an entire series on what's going on when the body isn't working right!
I am so glad I discovered this channel, these nervous system videos are saving me! Thank you
The animation in this particular video is just. AMAZING.
enormously helpful. brushing up on my A&P. Beginning school in September, pre-nursing.
Testing on CNS and PNS next week for online AP class. So glad there is crashcourse to explain it in more detail, instead of just studying class lecture notes in power point. Thank you!
"There's something on your face!" (HIT) "IT WAS NOCICEPTION!"
Found this chanel a week before my Anatomy exam (This friday!) Thank God for you guys! You made the most confusing and boring class fun and i finally understand the stuff i didnt!
I love CrashCourse, great job Hank.
i really like your videos.. they're really fun to watch..its nice to have fun and learning at the same time keep it up :)
I must enter a sensory deprivation tank. I heard it changes your life lol.
I know this is a completely unrelated topic, but I absolutely cannot wait to see Hank on Tabletop's RPG show this summer. I am so ecstatic to see him along with such a sublime cast. I am eagerly awaiting hearing and seeing his character.
These have helped me so much for exams !!
Wow, what a complicated and brilliant design.
I love the part about reassuring your dog ahah, so true!
i just love the animations thanks to crash course team :) and afcourse his funny reactions :) thanks a lot sir :)
I wish Hank you were my all time biology teacher. I would have scored 200 out of 100. Really appreciating job Hank.
Currently, I am working on my RMT...Crash Course, Hank, has made my studies understandable. Thank you, thank you, THANK YOU!!!
Thank you, crash course for helping me learn about the world of the physiology of the human body and is really important
Reflex Arc -- 6:40 -- Thanks for this info.
Thank you for getting me through Anatomy and Biology 👍
very informative 😊😊 thanks a lot to everyone participated in this video , keep it up 😃😃
Literally these videos save my life in Neuroscience class
I found this channel today and it is sooooooo freaking helpful!!!!!!!
Your videos are a life saver. Thank you for making amazing contents.
Stubbed my toe this morning moments before watching this video. Great timing.
This is so much better than school.
Crash course ,Mr Hank Green, obviously had produced an excellent educational material for our intellectual digestion. By combining what I have learnt elsewhere and the vivid pictorial illustration, it facilitates my learning process. Thanks Mr Hank Green sir, the producer. 🍉🥒🌶🧀🍤🥤🧱🌇🛶🌛🌈🥇
"...and then you're assuring your dog that you're not yelling at her, you're just yelling" 😂😂😂🤣🤣
your method of teaching is amazing
These videos have helped me internalize some of the content of my physiotherapy studies and the things I need to learn for my neurology exam.
I didn't notice how expressive Hank is before... xD
Luckily, I use blue tack for my crash course poster so no tack in my foot for me!
@crashcourse
9 жыл бұрын
Hazel Windsnap Good safety tips ;)
@hauntedfungus9884
9 жыл бұрын
CrashCourse Bad hank for making lemon worry you were yelling at her ;)
@ndroo1014
9 жыл бұрын
I use blue tack for my crash course poster too!
@shakeyf8
9 жыл бұрын
I use tape.
@nicholascooper945
9 жыл бұрын
CrashCourse Hank, can you please do a video for what happens to your body when you get sick? I'd like to see you do an episode on the subject.
Sr. Cerebro, gracias por ayudarme a evitar cualquier dolor. Tendré cuidado de no conseguirlo porque me duele.
Binge watching all your videos, thank you so much.
I suffer from chronic pain, fibromyalgia in the lumbar spine. I've been in varying degrees of pain since 2002. It is so effing frustrating to one day have such severe pain that I am crying and can't move and have to be driven to the ER only to be scanned and prodded and told "nothing's wrong" and given opiates and muscle relaxants and sent home. Then to be laid up for the next two weeks because "nothing's wrong." Acute pain is fantastic because there are reasons for it and it ENDS. Chronic pain just kind of claws its way into your life and stays there, and you just have to deal with it.
@Andrei-yv8fz
9 жыл бұрын
You're not alone, I have chronic pain, too. It's no fun. :(
@joblakelisbon
4 жыл бұрын
I agree - chronic pain is a torture chamber.
i'm a student nurse and i cannot express how helpful these videos are! :D!
dude honestly you freakin rock. these videos are SO helpful!!!! thank you so much!!!
Literally watching these videos over and over again just to understand :(
Good Job, CrashCourse!!
THE BEST THING EVER I LIKE TO SAY IM LOVING THE COURSE
Stepped on a tack while hanging up my crash course poster. I'm suing.
i learned that motor neurons send out excitatory and inhibitory info to reflex and extensor muscles in the leg (to pull away from stimulus), as well as opposite info to the reflex and extensor muscles in the other leg (for balance). not to the site of the stimulus
He is doing a video on the autonomic nervous system next! I really hope he talks about Dysautonomia.
Absolutely fascinating! You always explain stuff really well. :D
@3:54 I looked up the "fact" that all pain thresholds are the same for everybody. All it took was a simple Google search (and a very lengthy convo w/ ChatGPT) to learn that in actuality, pain thresholds vary for everyone. It's determinate on a number of factors like age and subjective pain tolerance.
Thanks crash course for explaining the PNS 🙏 It is quite helpful
He's got the perfect amount of 'Professor Fink' in his teaching delivery.
This video made me feel somewhat better for my wisdom-tooth-extraction pain :)
could u please do a course on plant physiology. that would really help . btw really luv ur vids . u guys r lifesavers :)
Just found your channel! How did I not know about this awesome channel!? You've got one more subscriber! :)
@JBoyle-jr9wb
9 жыл бұрын
Wow, Melissa hope you have days of freedom to catch up on everything. This is one of my favorite channels. I'll go to the biology playlist and end up falling asleep eventually because they play one after another for you. Then I wake up during a completely different subject discussion and realize I was dreaming about the inflammatory response.
@lopezmeli023
9 жыл бұрын
Yes! I was watching all of the nervous system videos and then I fell asleep and dreampt about glial cells! Lol weird but cool!
perfect video. Thank you !