What is the uveal tract?
The uveal tract is the middle layer of the eye, divided into the anterior uvea (iris, ciliary body) and posterior uvea (choroid). The uvea is sandwiched between an outer layer (sclera) and an inner layer (retina). The anterior segment is separated from the posterior segment by the lens.
Which structures are part of the uveal tract?
The uveal tract has 3 main parts: (1) the choroid (the tissue layer filled with blood vessels); (2) the ciliary body (the ring of tissue that contains muscles that change the shape of the lens and makes the clear fluid that fills the space between the cornea and the iris; and (3) the iris (the colored part of the eye).
What is the function of uveal tract?
It is the source of blood flow to the ocular tissues. It is the source of aqueous humour (fluid that fills the inside of the eye) and maintenance of intraocular pressure. It constitutes the blood-aqueous barrier and prevents undesired blood products from reaching the eye.
What is uvea made of?
The uvea is the middle layer of the eye. It lies beneath the white part of the eye (the sclera). It is made of the iris, ciliary body, and choroid. These structures control many eye functions, including adjusting to different levels of light or distances of objects.
Why is it called the uvea?
The middle coat of the eye is called the uvea (from the Latin for “grape”) because the eye looks like a reddish-blue grape when the outer coat has been dissected away.
Where is the uveal tract attached to the sclera?
It extends from anteriorly ora serrata to the optic nerve posteriorly. It has a rough outer surface which is attached to the sclera at the optic nerve and at the exit of the vortex veins. The smooth inner surface of the choroid is attached to the retinal pigmented epithelium (RPE).
What is uvea eye?
Overview. Uveitis is a form of eye inflammation. It affects the middle layer of tissue in the eye wall (uvea). Uveitis (u-vee-I-tis) warning signs often come on suddenly and get worse quickly. They include eye redness, pain and blurred vision.
Where is the uvea located?
the eye
The uvea consists of the layer and structures of the eye beneath the white of the eye (sclera).
What is the blood supply to the uveal tract?
The blood supply of the uveal tract is mainly from three arteries namely short posterior ciliary arteries, long posterior ciliary arteries, and anterior ciliary arteries.
What is difference between choroid and uvea?
The uvea or vascular tunic of the eye consists of the choroid, ciliary body, and iris. The choroid lies between the sclera and RPE, and contains connective tissue, capillaries, and melanocytes. The choroid terminates anteriorly as the ciliary body.