A Great Journey Inside Your Brain – YouTube Dictation Transcript & Vocabulary

1.[Music] did you know that every time you're watching a new video it's possible thanks to the world's most powerful supercomputer and I'm not talking about your laptop or phone here I mean your own brain let's take a journey in there to find out how it works but first I'll need a proper kind of equipment this machine here will hey what oh my it looks like I've turned myself into a Soundwave oh well whatever works and that's my friend down there so we'll get to see what happens in his brain interesting the outer ear catches the sound wave and the journey begins it's pretty tight in here in the ear canal let me squeeze in there we go Nick stop the ear drop it's about half the size of a dime what was that the eardrum starts vibrating I know that feeling so well it's like when your neighbor's party so hard you can hear it at the other end of the street moving on to the middle ear things are getting too loud here and this must be the cochlea that's Greek for snail by the way because duh that's what it looks like it's pretty wet in here it's all filled with liquid and it's getting stormy what are all those cute hairs there are so many of them oh I feel ticklish buckle they move and Bend and then the real magic happens vibrations turn into nerve impulses here woohoo things are getting crazy past here we're traveling down the auditory nerve next up the brain I think I need to put my shades on it's bright and sparkly in here all those trees look like they've come straight out of a sci-fi movie what if I touch it oh-ho it's like a lightning now these are my fellow new rods there are about a hundred billion of them about as many as the stars in the Milky Way you get most of them at birth but as you get older your brain keeps producing new ones Wow that was bright and again neuron sent somewhere between 5 to 50 messages every second more on that later we have places to go there are hundreds of neuron types and three main classes sensory neurons are like little secret service agents they collect information from your sense organs like eyes and ears and deliver it to your central nervous system these here are motor neurons they're the big bosses in your body they get information from other neurons and deliver it to your muscles organs and glands so basically they're telling you what to do all the rest are inter neurons they collect and receive information from other neurons this action is never ending it's like a huge chemical factory neurons work so hard they produce enough energy to light up a low voltage LED bulb Hey just try it yeah they did it the speeds in here are crazy up to 250 miles per hour like sports cars but let's slow down for a moment I want to know what happens here welcome to the cerebrum the largest part of the brain or around 85% so glad I never skipped anatomy class mm-hmm the outer layer of the cerebrum is made of gray matter the rest of the core is made of white matter does it matter yes it does the cerebrum interprets your senses of vision hearing taste smell and touch you can feel different emotions and learn new things thanks to it did you know your brain has unlimited storage capacity so that's what all these folds and grooves here are for okay enough with the cerebrum the next highlight on the itinerary today is the cerebellum also known as the little brain it's indeed way smaller than the cerebrum but not any less important of course careful that was one rough turn your little brain receives info from the sensory systems and the spinal cord and is in charge of the motor movements so thanks to it you can walk without falling have good posture and even speak it also helps you concentrate and keep emotions under control that differs person to person of course are you mostly calm or is it easy to freak you out let me know in the comment section below we still have places to go so let's keep moving neurons here come in all shapes and sizes but all have three basic parts there is the cell body the long tail called exon and dendrite that looks like tree branches if you zoom in on it neurons receive most of their information thanks to the dendrites let's hang on here and watch that's quite a show information transmission in progress just one neuron can't do much by itself so they work together as teams they talk in their secret language of electrical and chemical signals ooh did you see that little light just go out if not all messages can go through neurons sort of learn the relevant from the ear relevant and when you do something again and again so the same signal is going through the message gets even faster and is more likely to reach the goal one more thing that makes some parts of your brain more active is love it lights up an MRI scan hold on I think because of all those love talks we missed our next stop let's go back a bit nope not what we were looking for hmm so easy to get lost in this maze maybe it's here we're looking for something really small and almond shaped yay meet the amygdala everyone it's on our must-see list today because it plays a super important role it handles your emotions like fear and sadness and helps you keep your temper under control and it's like a scrapbook for your memories of events and emotions it stores them so you can recognize similar things in the future alright what's next oh that must be the brainstem it's in charge of communication between the brain and the rest of your body and you should also thank it for the things you do automatically breathing keeping your heartbeat regular digesting food and other basics the brainstem is connected directly to the spinal cord that's the central highway of your nervous system oh what's there traffic police hey I wasn't speeding officer I promise everyone is crazy fast in here this highway has lanes moving in both directions carrying messages to and from the brain hey Steve what are you doing don't you see that door right in your face do something brain you have to send a signal to his muscles okay I have to save him to the rescue who made it I'm human again and that phone is still ringing how long have I been away for just so you know it looks like this all happened in one thousandth of a second Wow [Music]