Muscles Of The Head & Neck | Anatomy Model
Alright, guys in this video we're going to talk about the muscles of the head and the neck first thing we're going to look at it, the muscles of mastication or the chewing muscles. I, remember, that's the muscles of mastication on masturbation all right. So the first thing we're going to do is we're going to take a look here at the first muscle here.
This is going to be the call to temporal is muscle. Now, the origin of the temporal is muscle is going to be the fossa temporal is on the temporal fossa. And it. Doesn't stir it down here at the conoid process, and the ramps of the mandible it's action is to be able to elevate the mandible.
Okay. So this is the temporal is muscle. And just remember in general it's going to elevate the mandible then I'm going to take and turn this guy over here to this side. If you look at 38, this is the masseter muscle, there's, a superficial and the deep masseter. But this is just going to be our superficial masseter right here. And the masseter muscles, just like the temporal is.
It helps to be able to elevate the mandible. And you can tell that again, because its origin is the zygotic bone it's, also, the zygotic arch -. And then the insertion is right down here at the ramps of the mandible and angle, the mandible, and they're going to elevates the mandible. If you look here, you can kind of see it here, that's 35 that's, the Bucks into, okay, that's the Box into and the butt. The Box into is actually what it does is it helps to be able to compress the contents of the cheek.
And to move the food towards the middle for chewing. And so this is the Box into, right there. Okay, and then I'm going to take there are two more muscles that you can't really see on this. That are also part of the muscles of mastication, which is the lateral steroid and the medial steroid, but they can't be seen on this model all right guys now we're going to take a look at the muscles of facial expression.
So first one is going to be this muscle right here. This is Bill it's, actually the frontal. Belly of the occipital front Alice right here. And then what I'm going to do here is going to kind of turn it up like that. And you can see here this little connective tissues, it's actually called mapping a rosette it's called it's, the Gala aponeurosis a' or the EPI cranial aponeurosis. And it connects the frontal belly with the occipital belly back here of the exit or front Alice.
Alright, another muscle, we're going to take a look at right here. I'm going to be this one right here. Wrapping all. The way around the eye, it's, a sphincter muscle, it's, 25, right here called the orbicularis could, the ridiculous could and the auricular ZA q, ties responsible for being able to for the squinting action. So it's being able to squint and blink the eyes, okay, that's their big Larry's, IQ line. And then the October frontal is the frontal belly. It will actually pull the eyebrow up.
And if you look here 34 this muscle, right there, this muscle is going to be called the lavatory lab by superior yours. And what it. Does it elevate the upper lip?
Now there is a tiny little muscle that you can kind of see right here that muscle, right there next to the left or lab by superiors called the zygomaticus minor like I said, as I go Magic is minor else to be able to pull the upper lip also kind of upwards and backwards to assist this muscle, right here, which is called the zygomaticus major. And the zygomaticus major is actually going to draw the angle of the mouth upwards and backwards for smiling. And if you look here.30 coming across from this corner of the mouth right here.
All the way over here to this lateral flash of the cheek is actually going to be called the rice aureus and the resides, the res aureus pulls the actual corner of the mouth laterally. And so that helps would like the face of grimness. Okay, then if we look over here at 29, this is called the depressor angle Boris, or they also call the triangular is because it looks like it kind of forms a triangle here.
And that is designed to be able to pull. The angle of the mouth downward, okay, so kind of to pull the angle of the mouth downward, then I'm going to turn it in here. And you got this muscle right there. And this is called to depress or lab I inferiors and it.
Basically it pulls the lower lip downward. So again, the depressor lab I in Fire, ours pulls the lip downward the lower lip. So right here is the mentalist. And the mentalist is actually designed to be able to protrude the upper to protrude, the lower lip right so helps to be. Able to kind of make that sad face - so protrudes, the lower lip right there. So BT 28 right here.
Another strength, there kind of wrapping around the lips right here. And this is actually called the orbicularis Boris, testicular sores. And it helps with being able to, you know, close the mouth and keep the mouth shut.
Okay. So that's, basically, a sphincter muscle and that's designed to be able to close the mouth, right? So that's their circular source and another muscle that you can kind of see right up here. Around the cartilage of the nose, the Highland cartilage is called the transverse innate stylus, right there. So that's, the transverse native Alex all right. So now we're going to couple extra muscles here. So this is right here, it's called the auricular, its anterior coming out to draw the ear and the skins' ear forward.
And then over here, we're going to have the auricular superior kind of draws the ear and the skin of the're upwards. And then this is the auricular posterior back there. And.
That's going to draw the ear in the skin of the year backwards. Alright, guys. So now we're going to take a look at the lateral neck muscles. So over here, we had this big, big, huge muscle.
This is the SCM or the sternocleidomastoid. Now, the sternocleidomastoid has its origin situated here at the sternal end here of those basically the anterior surface of the manubrium. And then it also has this curricular head here that attaches to the medial third of the clavicle there. And then its insertion point is.
Going to be over here at the mastoid process and a latter part of the superior nuclei line and its function is to be able to flex the neck and assist in Na, basically, the forceful inhalations now, we're going to go ahead and turn over here. The other lateral neck muscles. Alright, guys. So now we're going to take a look at the scalene.
So if you look here, this is going to be our anterior scalene right here. Number 44, then over here, we're going to have the middle scalene, which is 42, and now we're going. To the posterior scaling right here, which is going to be 43 and all of these guys function to be able to flex the neck and to be able to assist and inhalation. So now we're going to take a look at some posterior neck muscles.
So if you look here number 45, this is called our Levitt or scapula xi or scapula, it's actually going to be designed to be able to elevate the scapula all right. And if you look here number 19, this guy is going to be called the selenium wapitis. This is the selenium.
Capitis and it's designed to be able to help extend the neck. And if you look here, this is called the semi spine now as wapitis, and it also helps to be able to extend the neck. So now we're going to take a look here, the trapezius. So if you look at the trapezius here, this trapezius has these fibers or these descending fibers of the trapezius. And this trapezium is actually more superficial than these muscles over here that we talked about the so much, but not wapitis Cellini's, wapitis and 11, our. Scapula the trapezius because of its origin and insertion, it helps to be able to extend the neck and elevate the scapula I want to give you guys.
Another look at the trapezius muscle here. If you look here, this is the trapezius muscle, all right here. And you what I wanted to show you is how you can tell it's such a superficial muscle, I'm going to pull this part here out. And you can actually see these layers these muscles, right underneath it right here. So you can see like we talked about with the. Other the Harold head, you can see here that this is the swings wapitis. You can see here's the Levitt or scapula, and you get the rhomboids down here that we'll talk about in the future.
I would again, the trapezius muscle, it's, a very, very superficial muscles. Alright. So that pretty much gives us everything. We can know about the posterior neck muscles and a lot of neck muscles on this model. Alright, guys.
So now we're going to take a look at another muscle that we can only see it on this model here. Isis this muscle right here, and this is called the platysma, and what the platysma does that help to be able to pull or depress the mandible down. So you can actually see this is this platysma, and you can see how it's such a superficial muscle right here, and it's lying over this pectoral that has this pectoral fossa, right there that it actually originates on.
And then again, insertion is the inferior border of the mandible there. Now, we're going to take a look at the super high muscle. So the. Suprahyoid muscles are going to be all the muscles here above the hold bone, all their insertion points are right there on the hold bone. So if you look here, we have two bellies of this muscle, right? This is called the gastric, but it's called the anterior belly of the gastric. Then, if you look here number 47, this muscle, right there, this is called the gastric posterior belly, the gastric anterior belly and the gastric posterior belly.
They both help to be able to elevate the hold bone. Now. If the high bones fixed, the gastric answer belly, can also depress the mandible too so let's come over here. So if we look here guys, this is just a sub mended with the salivary gland. But 49 right here is going to be our mylohyoid there's. Another piece of the mylohyoid right there.
And then 50 is a genial hold. And we already said that 46 is the gastric answer valley. And if you look here, 48 48 is going to be the styloid muscle. And again, all of these muscles. All the ones that I've mentioned.
All elevate the hold bone, the only thing that's a little different is that the gastric anterior belly can depress, the mandible stage bones fixed all right. So now I want to look at the infrahyoid muscles. So that probably muscles are all the muscles below the hollow bones. And then again, these guys are going to depress they're going to pull a bone down.
So then their insertion points of D-Day. If you look right here, 53, this is going to be the Omaha toy, but it can be the superior Valley there's, an. Intermediate tendon that you can't taste underneath the sternocleidomastoid that connects the two bellies again. This is the Omaha with superior belly.
And this is the Elma hold inferior value right here. And again, the odontoid andreabailey and superior belly are connected to what's called an intermediate tendon. We're going to take another look here. I wanted to show you guys. You guys couldn't see the intermediate 10 in between the superior, odontoid and Imperial model.
But if I remove the. Sternocleidomastoid out of this. And so, as you can see, you guys this structure, right, there, that's the intermediate tendon again, that's, what connects the two odontoid bellies together? And while we're here, we can also see a couple other structures. If you look here number 26, 26, right, there is actually going to be the anterior scalene twin fibers. We middle scaling and 24 is going to be the posterior scaling.
You can see the level or scapula right there. And if you look over here, you guys can see. They're xx, the gastric posterior belly and see it also it attaches right there to that mastoid notch there. And over here is 2121 is their spiral highway.
You can attach the styloid process there. So that just gives you guys. Another view of these neck muscles. All right the other infrahyoid muscles going to be right here.
This is called the sternohyoid muscle, the sternohyoid muscle. And then over here, number 56, that's actually going to be the sternothyroid. Okay. So that's going to be the strain of. Thyroid, and so we have sternothyroid, and we got the sternohyoid, and then we got the Omaha Osaka and for your belly. And again, all of those are infrahyoid muscles, meaning that they depress the hold bone. And all of these things were trying to change to depress and elevate, the high bone all play a role in flow nation or voice production all right, guys, it's pretty much going to finish up everything that we talked about for the head and the neck muscles.