Learn Structure of Eye Ball in 15 Minutes!


Right, Today we are going to continue the
lectures on the structure of eye ball. Already we have discussed cornea, sclera,
right? and we have also discussed the arterial supply to the eye ball. Right? Today we will specially talk about that uveal
tract. Right? So…. let me very briefly review the basic
structure of the eye ball and than we will go into detail of the uveal tract. As you know that basically eye ball has three
main layers. Right? In which this is the outer most layer and
this outer most layer is considered a protective layer and this outer most layer of eye ball,
its interior most area is transparent. This is transparent and this is called cornea
and this other part, this is white made of collagen, its a tough membrane and this is
called yes? Sclera! Very good! Right? So we can say the outer most layer or coat
of the eye ball is protective part right? Its posterior five sixth consists of sclera
and interior you can say one sixth is basically cornea which is transparent. Right? Am i clear? Then! Inside it, innter to this structure, inner
to the sclera there is the main vascular layer of the eye ball and this vasular layer of
the eye ball, here I will make it just inside the sclera, it extends on posterior surface,
posterior area of the eye ball and it extends interiorly. Right? Now this vascular layer of the eye ball. Right? or the middle layer of the walls of
the eye ball, this thickens as it approaches interiorly, it becomes thickened. It becomes thick. Right? As it approaches interiorly and then this
thickened part right? Now this thickened part is called ciliary
body and all vascular layer behind it is called choroid and than there is a diaphram like
structure but this is also vascular layer and this interior most part is called. This is a diaphram like structure with a central
apperture, the apperture is called “Pupil” and this part is called “Iris”. Is that right? This is called “Iris”. Now, this is, yes! from here, from back upto
here and here right all this structure is yes? Choroid. This is called Choroid and this structure
and this structure this is called cilliary body and this part is called Iris. Is that right? This is called Iris. Right? and all of this vascular layer is actually
called “Uveal Tract”. So what is uveal; tract? Uveal tract is basically middle coat of the
eye ball wall and this is vascular coat, rather I must say its vascular pigmented coat. Its pigmented as well. Right? and heavily vascular structure and
this posterior five sixth of the eye ball, this is basically choroid and than this yes
enlarged part is called cilliary body this diaphram like structure with a central apperture
right? This is called Iris. Right? and inside it there is yes? here the
structure is yes please? Retina. Excellent! This is called Retina. Now! As we will discuss later that retina has part
in which this is having lots of rods and cones right? and a part of retina where rods and
cones abruptly terminate at this point and this point. Rod and cones you can say abruptly terminate,
the point of the retina where rod and cone terminate this point is called “Ora Serrata”. What is it called? Ora serrata! and a part of the retina, right? It moves forward right? the pigmented layer
of the retina moves forward and it continues behind the Iris and cilliary body and iris. Now upto this point from here upto this point
this is that part of the retina which is sensitive to light and interior to this point right? Part of the retina which extends forward it
does not have rods and cones so it is called that part of the retina which is not sensitive
to the light and the point where these two part of the retina meet with each other right?
the point where visual part of the retina or light sensitive part of the retina abruptly
terminates right? That point is called Ora Serrata. Am I clear uptill now? and than ofcourse you
must be knowing that here is a structure called yes? Lens and behind the lens there is another
structure here and this structure is called Vitreous humor. This is called Vitreous humor which is filling
up the eye and lens is attached with special ligament with the cilliary body and these
ligaments of the lens which are holding the lens or attaching the lens with the cilliary
body these are called zonules or they are called suspensory ligaments. Is that right? They are also called suspensory ligaments. Any question about this? No, so this is a very basic structure of the
eye ball. We have already studied the structure of the
sclera, we have already lectures on the sclera, we have also previously recorded lecture on
cornea is that right? and we have specifically had a very explanatory lecture on the blood
supply to the eye ball. Vessels which are supplying the eye ball. I will briefly review that also because if
blood supply to the eye ball is somewhat clear than it will become very easy for you to understand
the vascular supply within the uveal tract. Again! What is uveal tract? Uveal tract is the vascular middle layer of
the eye ball, is that right? Uveal tract has posterior most part which
is called choroid. Than at ora serrata and forward uveal tract
becomes thicker and that is called cilliary body and than more interiorly uveal tract
or this vascular layer becomes a diaphram like structure with central apperture to allow
the light to pass through that is pupil and this diaphram like part, diaphram like curtain
with a central apperture, this is called iris. Is that right? Any questions upto this? Its clear? Ok! Now, very very briefly blood supply to the
eye ball. Right? and than we will continue our lecture
on uveal tract. Before I go for that you will tell me what
is this structure now from here upto here? Yes? What is this structure? Choroid. What is this structure? Cilliary body. Excellent! and what is this structure? Iris, and all of this is uveal tract. Am I clear? and all of this is uveal tract? Now the blood supply. Right? Very briefly. Mainly the blood vessels which are coming
to the eye ball, they are coming from opthalmic artery. Right? From opthalmic artery number 1 artery goes
here and this enters through the optic nerve inside the eye ball and supplies the retina
and this artery is called “Central Retina Artery”. This is central retinal artery. Right? Then there are another group of vessels. For example, I show it here that this will
enter into eye ball outside the optic nerve and this artery will yes here you see it is
supplying which structure choroid. What is this? Blood vessel supplying choroid, and this blood
vessel, right? the first blood vessel was central retinal artery and number 2 blood
vessel this and this these are posterior cilliary arteries but they dont reach upto the interior
part, they dont reach upto the interior part of the uveal tract so we call them there are
posterior cilliary artery. What are these? Posterior cilliary artery and because they
dont reach anterior most area they are considered short, they are not long. So what will be the name of this artery? Short posterior cilliary artery. Now the long posterior cilliary artery look
at it, it comes from here it enters and it moves forward forward forward and reaches
upto here, its really long! You see? Posterior cilliary artery is mainly supplying
choroid. Posterior, short posterior cilliary, short
posterior cilliary mainly supplying the choroid and long posterior artery number 3 and you
can put here also its the same so long posterior cilliary moves forward and they are reaching
upto here. This is called what? Long posterior cilliary. Now listen! This is posterior cilliary right? This is also posterior cilliary but both of
them are reaching not reaching to the cilliary body and not reaching to iris so these are
posterior short cilliary and these are entering and reaching more interiorly so they are posterior
long cilliary. Is that right? Am I clear? Then! here are the muscles, supplying the
eye ball, attached with the eye ball and some opthalmic artery branches go to the muscles
and from the muscular sub branches enter what is this? Enter into cilliary body, that is right. This is muscular branch of opthalmic artery,
from here a branch goes to the cilliary body also, now this branch, this is also going
to the eye ball, this is also going to the eye ball, this is considered you can say number
4 and 4 this is considered anterior cilliary artery. This is considered anterior cilliary artery. Any questions upto this? Now you have to tell me. What is this branch which through the optic
nerve entering into eye ball and supplying the inner most layer of retina. What is this artery? Yes? Central retinal artery. Now these are again branches which are entering
from the back of the eye ball, so this is posterior artery, sorry this one, the number
2, this is posterior artery, because its going to eye ball, posterior cilliary artery but
it is supplying mainly choroid and not supplying the cilliary body and this is not supplying
the iris, so this is short posterior cilliary, short posterior cilliary, then this is an
artery that also enters from the posterior end of the eye ball. Right? It is posterior cilliary but it moves forward
and it reaches upto cilliary body, right? and its branches will supply the cilliary
body and even to the iris. So this is called posterior long cilliary
artery. You know the difference in short and long
cilliary artery and than anterior cilliary. Anterior cilliary artery is a branch of muscular
branches of opthalmic artery and it enters in the eye ball from anterior part, right? Anterior to the middle, and anterior cilliary
and once it enters in the cilliary body it also makes anastomosis with the long posterior
cilliary artery. Am I clear? This was a very brief review. Now, we will go into detail of uveal tract,
as you know already uveal tract consists of three, what is uveal tract? Its a vascular pigmented layer in the eye
ball and its a middle layer because outer layer is sclera, middle layer is uveal tract,
out layer is cornea and sclera, middle layer is uveal tract and inner most layer is retina. Am I clear? See our Video Library at www.DrNajeebLectures.com

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