What part does the uveal tract play in the nourishment of the retina?

The uveal tract is divided into three distinct portions: the iris, the ciliary body, and the choroid. The most posterior, and largest, portion of the uvea, the choroid, provides nourishment for the outer retina, especially in the region of the macula, and regulates ocular temperature.

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.

Which part of the eye is uveal?

uvea (or uveal tract), the middle layer of tissue surrounding the eye that consists of the iris, ciliary body, and choroid. Uveitis can affect people at any age, but onset usually occurs in the third and fourth decades of life.

What are the three structures that divide the eye into two chambers?

The inside of the eye is divided into three sections called chambers.

• Anterior chamber: The anterior chamber is the front part of the eye between the cornea and the iris.
• Posterior chamber: The posterior chamber is between the iris and lens.

What are the 3 layers of the eye?

These layers lie flat against each other and form the eyeball.

• The outer layer of the eyeball is a tough, white, opaque membrane called the sclera (the white of the eye).
• The middle layer is the choroid.
• The inner layer is the retina, which lines the back two-thirds of the eyeball.

What are the retinal layers?

The cellular layers of the retina are as follows: 1) The pigmented epithelium, which is adjacent to the choroid, absorbs light to reduce back reflection of light onto the retina, 2) the photoreceptor layer contains photosensitive outer segments of rods and cones, 3) the outer nuclear layer contains cell bodies of the …

What is the ciliary epithelium?

The ciliary epithelium of the ciliary processes produces aqueous humor, which is responsible for providing oxygen, nutrients, and metabolic waste removal to the lens and the cornea, which do not have their own blood supply.

What is eye uvea?

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.

Are eyeballs perfectly round?

Ideally, an eyeball is shaped like a perfectly round ball. Light comes into it and bends evenly, which gives you a clear view. But if your eye is shaped more like a football, light gets bent more in one direction than another. That means only part of an object is in focus.

What are the main part of human eye?

The main components of your vision include: Cornea: This is the front layer of your eye. The cornea is dome-shaped and it works by bending the light that enters your eye. Pupil: The pupil is the black dot in the center of your eye that acts as a gateway for light.

What are the 4 layers of retina?

What are the 10 layers in retina?

Layers from outside in: (1) retinal pigment epithelium; (2) rods and cones (photoreceptors); (3) external limiting membrane; (4) outer nuclear layer; (5) outer plexiform layer; (6) inner nuclear layer; (7) inner plexiform layer; (8) ganglion cell layer; (9) nerve fiber layer; (10) inner limiting membrane; (11) vitreous.

What is the anatomy of the uveal tract?

The uveal tract consists of a pigmented, highly vascular loose fibrous tissue that can be divided into three anatomical regions: anterior iris, central ciliary body, and the posterior choroid. 1 The uveal tract is firmly adherent to the scleral spur anteriorly, the optic disc posteriorly, and at the exit points of the four vortex veins in between.

Is the uvea the middle layer of the eye?

Carlos Franco-Paredes MD, MPH, in Core Concepts in Clinical Infectious Diseases (CCCID), 2016 The uvea comprises the iris, ciliary body, and choroid. The iris regulates light that reaches the retina, the ciliary body produces aqueous humor, and the choroid nourishes the retina. The uvea is the pigmented, middle layer of the eye.

Is the uveal tract similar to the optic nerve?

The uveal tract is analogous to the vascular pia-arachnoid of the brain and optic nerve, with which it anastomoses at the optic nerve head. The choroid is described on p. 55; the iris and ciliary body are described below.

Which is the middle layer of the eye?

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.