Ascending Tracts | Spinocerebellar Tract

I initiatives in this video we're gonna talk about the spinocerebellar tracks so again if you guys haven't already please go watch the dorsal column medial meniscal pathway first then after that go watch the spinothalamic pathway after that watch the pain modulation video now the last one we're gonna talk about is the spinocerebellar tract so let's go ahead and get started on that so spinocerebellar tracks they are there as they say they're going from whatever receptor which we'll talk about into the spinal cord up to the cerebellum and most of pretty much all of them are FC lateral okay so now what are some of these spino cerebellar tracts okay so let's talk about these ones so the first one we're going to talk about is going to be what's called the dorsal spine Oh cerebellar tract we're actually going to kind of write this down you might see me write it as D s T dorsal spinocerebellar tract another one is going to be called the ventral spinal tract and again you might see me be a little lazy bugger and write that as VST and we'll talk about one more okay which is really important and this guy is called the cue neo cerebellar tract okay just because I'm lazy I'm gonna put C T alright so these guys are really important okay and we're gonna talk about these in pretty good detail and talk about their stimulus we'll talk about their receptors we'll talk about where they're going to in the spinal cord and where they ascend to where they terminate so let's go ahead and start off with the dorsal spinocerebellar tract first and we'll also just to throw this one in there at the end we'll do one last tract and that is actually gonna be called the spine o Oliveri tract well throw this one in there at the end because it's related to the cerebellum okay goes to the olives first the inferior olives and then it goes to the cerebellum so we'll discuss this one last okay all right so let's go ahead and get started on the dorsal spinocerebellar tract so again we know that these tracks what is a track it's a bundle of white matter axons basically that are moving in the central nervous system and these are ascending tracks okay so because they're going from the spinal cord to the cerebellum now what is the actual stimulus for these tracks pretty much all of these tracks to make it easy on yourself pretty much all of the spinocerebellar tracks respond to proprioception okay so pretty much all of these tracks respond to proprioception so what is this proprioception proprioception we've talked about this in the dorsal column pathway but proprioception is really important it's basically the since this sensation the unmanned this case insists the cerebellum is the unconscious awareness of one's position of their limbs are their trunk in space so in other words how do I describe that I know where my arm is right in space I know where my finger is I know it's touching my nose I know it's touching my eyes in another way these proprioceptors not only are they going up through the dorsal column right that tract but some of them are actually terminating in the cerebellum so now this information is gonna go to the cerebellum now the cerebellum is important right because the cerebellum controls posture it controls balance it controls muscle tone and coordination of muscle movements now how does it do that though how does it maintain our posture how does it coordinate these muscle movements help us to have very precise muscle movements how well the way it does that it has to be able to get incoming sensations from our periphery it also has to consult with our cerebral cortex and so by doing that it can allow for it to really calculate an accurate movement that's why the cerebellum is so important that it needs to constantly beginning information from our proprioceptive that is the primary important one but it can receive some other sensations from Xterra receptors like touch and pressure receptors but I want you to remember the main stimulus is proprioception and where is that proprioception coming from remember we have those muscle spindles right so we have those muscle muscle spindles I remember the muscle spindles the other two parts you have the nuclear bag fibers and nuclear chain fibers right and the nuclear chain fibers were responding specifically what they were responding to the beginning of stretched nuclear bag was responding to the progression of stretch then we also had some other structures here which was the Golgi tendon organ and these responding to the stretch of the tendons now I did say that you can also not only respond to proprioception but also touch and pressure okay so this is important it's not as significant as the proprioception but it can have some unconscious sensations that it can pick up like touch and pressure so it can pick up information from like your meissner's corpuscles okay it can pick it up from the pacinian corpuscles maybe from the Ruffini corpuscles all right so different types of receptors different types of touch and pressure receptors now as this information comes together so we'll have touch and pressure receptors will have this proprioception all this information is gonna go into the spinal cord so it's coming down to the bottom part of the spinal cord okay now from here what do you have here you have the dorsal root ganglion right so you have the dorsal root ganglion here this is where the first-order neuron is so again dorsal root ganglion is where the first-order in a run of this pathway it's the dorsal spinocerebellar tract from here the peripheral process is picking up the proprioception the touch and the pressure transmitting it down to the pseudo unipolar neuron and into the central process where does it go from here now there's a specific nucleus that this is going to stop on I guess very specific one so this is again we're talking about the dorsal spinocerebellar tract so this right here that nucleus is a very specific nucleus okay and we're going to talk about that now because we have to understand this first okay so let's let's let me explain how this works this dorsal spinocerebellar tract because it's important so imagine here I take a part of the spinal cord here right and let's say that this is like the midline region okay and then this is right side this is left side there's a set of nuclei located that within the actual posterior gray horn a certain length of segments in the spinal cord so you're gonna find these nuclei okay they're actually located within the rex lamina seven if you want to know and these nuclei extend from c8 all the way to l2 maybe even l3 so because of that these nucleus they make a column if you will all right so what is this column they call this Clark's column and it extends from c8 all the way down to about l3 and that is that second order neuron for the dorsal spinocerebellar tract so that's really important so what is this nucleus right there that nucleus is Clark's nucleus it's a part of Clark's column where does it go from here okay so now from here from this Clark's nucleus which is extending from c8 all the way down to l2 l3 it's going to come over here into the lateral white column so over here all this area right here is lateral white column it's going to go more than the posterior or dorsal part of the actual lateral white column and then guess what it's going to ascend so now we're gonna have this soccer moving upwards here so now we should understand here how this works first order neuron is within the dorsal root ganglion second order neuron extends from c8 to l2 l3 and that is going to be Clark's nucleus which is actually going to be here within lamina Rex lamina if you will Rex lamina seven and then again from here it's got it's actually gonna move if see lateral within the posterior or dorsal part of a lateral white column and then ascend upwards now from here where is it gonna go you know there's a special type of white matter fiber right here and this is medulla pons midbrain cerebellum what happens is there's an actual white matter structure here where these fibers can actually pass through and then go and supply thee cerebral cortex I'm sorry not cerebral cortex cerebellar cortex this structure right here that it's actually moving through is called the inferior cerebellar peduncles okay so again what is this tract right here called this tract is called the dorsal spine Oh cerebellar tract okay so our DST we're calling it here all right we got that sucker down okay now I'm gonna bring him a little bit more posterior since we said he was posterior so that's a little better I like that now all right cool so we got the dorsal spine a cerebellar tract which again that's extending from c3 I'm sorry c8 all the way down to l3 and what type of sensations is it picking up touch pressure proprioception sweet deal the third-order neuron is gonna be the cerebellar cortex so again you'll have some nuclei out here that it can actually go to and again that is going to be the cerebellar cortex that's its final termination site okay so we covered the dorsal spinocerebellar tract well now we need to do the next one which is the ventral spinocerebellar tract this one's kind of a tricky one so this one's picking up information from below l3 so any structures that are coming from below l3 so from l3 l2 l3 all the way down to the coccygeal to the coccygeal one right all this part down here is going to be carried by the ventral spinocerebellar tract so again from l2 l3 below is gonna be carried by the ventral spinal cerebellar tract okay so let's go ahead and zoom in on that one now so since this one's a tricky one I want to show you guys this one it's very interesting let me actually get this out of the way here let me put this right here this is our dorsal spinocerebellar tract okay this one's very cool I like this one a lot let's say we come from here same thing it's also going to be carrying information of proprioception it's going to be carrying touch and pressure but it's going to be carrying it from information below l2 l3 this guy again he'll go to what's called the dorsal root ganglion right in the dorsal root ganglion you're gonna have this pseudo unipolar neuron that is going to be the first order neuron from here he's gonna come into the actual dorsal gray horn and sign apps on cell bodies within the dorsal great horn from here here's where it gets tricky he crosses over to the opposite side to the contralateral side and then ascends upward so what do we have here for the ventral spinocerebellar tract so again this one right here is the ventral spinocerebellar tract first order neuron is actually gonna be the doors in the dorsal root ganglion second order neuron is gonna be within the posterior or dorsal gray horn then it crosses to so it goes across the midline via the anterior commissure and crosses over to the contralateral side of the spinal cord and ascends upward now as it goes upwards it goes all the way up here so now there's tract it goes in to where the midbrain enters and goes through this white matter structure now what is this sucker called well what's up this was the inferior cerebellar peduncles connecting the medulla to the cerebellum this is the middle cerebellar peduncles connecting the pons to the cerebellum so this one's got to be the superior so this one right here is called the superior cerebellar peduncles okay now from this here's why I told you it's a tricky tract right look what it does this guy's really sneaky he moves behind so you know there's the - cerebellum right this guy moves from one side of the cerebellum so let's say that this in this case this is the left cerebellum this is the right cerebellum he moves behind this structure into the opposite side so look here I'll draw like kind of like a dashed line here it's going behind and it's going to the other cerebellum so across is twice and then from here it's I naps is on me third order neurons of the cerebellar cortex right so that's what's really important so the ventral spinocerebellar tract the only difference is from the dorsal because if they both carry proprioception touch and some pressure the only difference is that the dorsal comes in crosses over if see lateral to the latter like hollom and ascends upward all right and then it goes to the inferior cerebellar peduncles click with the actual cerebellum the ventral is actually gonna come in cross a sin go in and cross again now why did I say now if you look here let's pretend for a second I have this guy come right here so I just want you to understand why they say that this is dorsal the the pink pathway here comes in sign APS's and then look where it goes it goes here and comes up okay so this is going to be the posterior part of the lateral white column this is the anterior part of the latter white column or and to say it a different way this is the dorsal part of the lateral white column this is the ventral part of the lateral a column so that's why they call this tract going upwards the blue tract the ventral spinocerebellar tract that's why they call this pink one because it's a more dorsal to it that's why they call it the dorsal spinocerebellar tract okay so I just want to make sure that we're clear on that okay sweet deal so we've done the ventral spinocerebellar tract we've done the dorsal spinocerebellar tract now it's time to do the kunio cerebellar tract what's so easy since we set this establishment down for the dorsal spinocerebellar that from c8 to l2 l3 is the DS dia the dorsal spine Oh cerebellar tracked below l2 l3 is the ventral spinocerebellar tract what you think is above the cuny a cerebellar tract so now it's not so hard to understand that anything above c8 up to c1 should now be the cue neo cerebellar tract so this is mainly picking up proprioception touch and pressure from the upper limbs and the actual head and neck structures so that should make sense so now how does that work okay let's actually show this guy now let's do that here we'll come at this level actually no will come up yeah will come up at this level so here we're gonna have this guy coming in here actually there's more room here let's do it here so here is going to be this guy right again this is going to be the peripheral process it's gonna be picking up touch pressure proprioception from like the head the neck the upper limb structures and then what it's going to send it to central processing from here when it goes into the central process it goes into the post here gray horn right goes into the post chair gray horn and then it actually moves upwards apes see laterally right so it moves upwards and as it moves upwards it comes to a special nucleus okay comes to a special nucleus here that is actually located within the medulla this nucleus is really interesting because it's gonna sound familiar it's gonna sound very very familiar this nucleus is called the accessory CUNY eight nucleus you're probably wait a second I've heard of that before CUNY nucleus CUNY ATIS well that was for the dorsal column medially meniscal pathway here's the thing with the CUNY Oh cerebellar track they're not sure yet if it actually moves up with the fasciculus CUNY Attis or not but they know that it actually ascends and moves if see laterally and picks up sensations from anything above c8 the head in the neck and the upper limbs they just know that it ascends upwards and it synapse is on this structure here located within the medulla called the accessory or the external CUNY eight nucleus then where does it go remember here just for simplicity sake here you had the nucleus CUNY ADIS nucleus gracilis nucleus gracilis and then nucleus CUNY anus right they got synapse is from the dorsal column and then they crossed over right and when they crossed over we called that cross the internal arcuate fibers all right they call that cross at the internal arcuate fibers well guess what this accessory CUNY a nucleus gives off fibers that move through the inferior cerebellar peduncles they call these fibers that are coming from the accessory CUNY a nucleus the external arcuate fibers so beautiful so this is called the external arcuate fibers now from here where will it go it'll go through the inferior cerebellar peduncles and it'll go and supply parts of the cerebellar cortex so again just remember that does CUNY Oh cerebellar tract let's actually put this a little bit more over here they're not sure if it moves up but they think that it might move up through the fasciculus CUNY itis but instead of it actually sign app saying at the nucleus CUNY Attis it actually sign apps is at a different portion here and that is called the accessory or the external CUNY a nucleus and then from there fibers will come to the cerebellum through the inferior cerebellar peduncles and these fibers that are going to go into the inferior cerebellar peduncles it's called the external arcuate fibers okay so that covers that guys now last part I said that we were gonna do a little tidbit on the spinal Oliveri tract this one is important too okay there's special nuclei located within the medulla and these nuclei here are called the inferior Oliveri nuclei so these are called your inferior Oliveri nuclei okay these guys right here this system is a little bit odd okay so another little tricky tract okay how does this one work okay let's actually do this one in green once we have this in green so this tract is a little interesting so it's going to be picking up about a bunch of different proprioception a bunch of different touch a bunch of different pressure how does this tract work okay so let's say here we have this guy coming in again this is going to be the peripheral process picking up touch pressure proprioception and then this is going to be the central process which is going to be going into the dorsal root ganglia a little bit farther here in the dorsal root ganglia it's going to synapse on a second order neuron so here's our second order neuron from here it's going to cross over it's going to cross over to the contralateral side through the answer why commissure and then move upwards now as this tract moves upwards it comes in its sign apses on this nucleus right here this inferior Oliveri nucleus now from the inferior Oliveri nucleus something tricky happens so again what happens here these fibers are coming in dorsal root ganglion into the posterior horn synaptic on the cell bodies they're crossing to the contralateral side ascending upwards as the spinal Oliveri tract as it goes upwards at synapse is on the inferior Oliveri nucleus from the inferior Oliveri nucleus these fibers cross the midline so they cross the midline and go over to the other side and then enter into this the actual cerebellum through what's called the inferior cerebellar peduncles okay so the same thing if we were having it come up here throw on the opposite side what would it do it would cross over here and then move into the inferior cerebellar peduncles and then supply the cerebellar cortex there's a reason why we should mention these any fibers that are coming from the inferior Oliveri nucleus going into the cerebellum have a specific type of name these fibers these green fibers if they're coming from the inferior Oliveri nucleus they call these climbing fibers okay they call them climbing fibers any other fiber any other fiber which is coming from the ventral spinocerebellar tract the dorsal spinocerebellar tract the kunio cerebellar tract any of that information that's going into the cerebellum besides the inferior Oliveri nucleus for example this pink fiber here this pink fiber was coming from the dorsal spinocerebellar tract any fibers other than the climbing fibers which are coming from the infra Oliveri nucleus are referred to as mossy fibers okay they're called mossy fibers so there's two different types of fiber fibers climbing fibers which are coming from the in fear Oliveri nucleus and mossy fibers which are coming from anywhere any other fibers okay whether it be dorsal spinocerebellar ventral spinocerebellar or cuneus to spinocerebellar i'm sorry chunio cerebellar tract okay and where was the cue neo cerebellar just so we can have that here so we can have it all mark down that was this guy right here so this guy right here was our cue neo cerebellar tracked and then the last one was this green one here and this green one was the spy no Oliveri tracked all right knizner so that pretty much covers everything that you guys would need to know about the spinocerebellar tracks I hope it all made sense I really truly do guys I hope you guys enjoyed it if you guys did please hit that like button comment down the comments section please subscribe you guys also if you guys have the time please go check out our Facebook account or Instagram maybe leave some comments like some pictures there also if you do have the opportunity maybe even 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Channel: Ninja Nerd

Views: 141,257

Rating: 4.9792624 out of 5

Keywords: ascending tracts, spinocerebellar tract, cuneocerebellar tract

Id: 6gqJMcNpNgA

Length: 26min 11sec (1571 seconds)

Published: Mon Jan 08 2018