External Eye Anatomy


– [Instructor] Hey, everybody. I want to go over the
external portion of the eye. I’m going to have another
video in which we’re gonna go over the internal portion of the eye. So, for this video, I
want to begin with this starting with the transparent portion, and so, obviously, it’s transparent, so you are not gonna be
able to see it clearly, but you should be able
to see that reflection. And this is going to be called the cornea. And then, the white will be the sclera, and the colored portion,
in this case it’s blue, this is gonna be the iris. And, because an iris is a flower, I like to think of it as oh
well, flowers have colors, therefore, if it has a color
it must be an iris, right? So, that’s going to be the iris,
and then the black portion, which is going to allow
light to come into the eye, this is going to be the pupil. So, pupil, iris, sclera, and then the transparent portion
is going to be the cornea. All right, so if we
turn this sucker around, what you’re gonna see
is this top muscle here, it’s going to be called the
superior levator palpebrae. And, palpebrae is going
to refer to an eyelid. And, you can imagine
superior levator palpebrae, that’s likely going to
lift this eyelid so, this is going to be superior
levator palpebrae on top, and it’s important to locate
this because there’s an important muscle right below that, and that muscle is going to be called the superior rectus so, just
make sure that you know hey, this is gonna be superior palpebrae, and this is going to
be the superior rectus. And, one way you could think of it, is that the superior levator
palpebrae attaches right to, really, where your eyelid would be. (mumbles) kind of helicopter
this thing over there. And the superior rectus clearly attaches to the surface of the eyeball. So, superior levator
palpebrae, superior rectus, and then this structure here is going to be the lateral rectus. And so, this lateral rectus, obviously, because this side is going
to be away from the body. So, what I’ve done is got another model, and what I want to show you is, and I could actually
bring them side by side. That might be, actually,
a little bit more helpful. And so, if you look at them side by side, what you can see is
that, what I’ve done is, I’ve actually removed the
superior levator palpebrae, the superior rectus,
and the lateral rectus, so, that you can see these other muscles. So, the muscle up here is going to be called superior oblique muscle. And, it’s kind of a funky muscle because this muscle is going
to go all the way up here, and then it then has a tendon, which then attaches right to the eye. And so, number five,
along with the tendon, along with this muscle, this is going to be called
the superior oblique muscle. And then, this muscle
that runs very medially, as you would imagine, closest to the nose, that kind of helicopter that over there, this is going to be the
medial rectus muscle. I just want to make sure. Yup, the medial rectus muscle. And then, the muscle down here will be, obviously, the inferior rectus muscle. And then, this muscle
that you can see here, on the side, this will be
the inferior oblique muscle. So, inferior oblique muscle,
inferior rectus muscle, medial rectus muscle,
superior oblique muscle. You can see how it
kinda comes around here. And then, if you look here, one and four, this is gonna attach directly to the superior rectus muscle,
even though we removed that. And, number four, obviously, would be the lateral rectus muscle, which we’ve just removed. All right, so I think that is it. Just going to kind of zoom back out, and I will put this back up here. Well, I’ll just leave it. So, hopefully, that has been helpful, and I will start another video
looking at the internal eye. OK, take care.

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