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 does the uvea consist of?
The uvea consists of the layer and structures of the eye beneath the white of the eye (sclera).
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.
Which veins drain the uvea?
The vessels of this layer branch and form medium-sized vessels. The layer of these medium-sized vessels is known as Sattler’s layer. These vessels again branch forming smaller vessels and capillaries. Venues of choroid drain into veins which ultimately drain into four vortex veins (one from each quadrant of the eye).
What does uveal mean?
u·ve·a. (yo͞o′vē-ə) n. The vascular middle layer of the eye constituting the iris, ciliary body, and choroid. [Medieval Latin ūvea, from Latin ūva, grape.]
Who produces aqueous humor?
Aqueous humor is produced by the ciliary body and it flows (dashed line shown with arrowheads) from the posterior chamber through the pupil into the anterior chamber.
What is difference between uvea and choroid?
is that choroid is (anatomy) the vascular layer of the eye lying between the retina and the sclera while uvea is (anatomy) the middle of the three concentric layers that make up the eye; it is pigmented and vascular, and comprises the choroid, the ciliary body, and the iris.
What is retina and uvea?
The middle coat is the uveal tract and the inner coat is the retina. The uveal tract consists of 3 parts. The iris is the visible part of the uvea and gives color to the eye (blue, black, brown). The ciliary body is the middle layer of the uvea which manufactures the fluid inside the eye.
What types of pathological processes of uvea do you know?
Common pathologic changes involving the uvea include inflammatory and neoplastic diseases. Inflammatory changes are clinically recognized as various forms of uveitis. Among the neoplasms, both primary and metastatic tumors are found in all parts of the uvea.
What is the fovea?
The fovea centralis, or fovea, is a small depression within the neurosensory retina where visual acuity is the highest. The fovea itself is the central portion of the macula, which is responsible for central vision.[1][2][3][4]
What are the three layers of the wall of the eye?
The wall of the eye
outer layer – made up of the sclera and cornea (called the fibrous tunic)middle layer – made up of the uvea (called the vascular tunic)inner layer – made up of the retina (called the neural tunic)
What are vortex veins?
The vorticose veins, more commonly referred to as vortex veins, drain the ocular choroid. Some empty into the cavernous sinus through the superior orbital veins, whereas others drain into the pterygoid plexus through the inferior orbital veins.
What is Vena Vorticosa?
Medical Definition of vena vorticosa
: any of the veins of the outer layer of the choroid of the eye.
What is pars plicata?
The pars plicata is the portion of the ciliary body that is responsible for producing aqueous humor, the fluid of the anterior chamber. The production of too much aqueous humor, or reabsorption that occurs too slowly, can lead to increases in the pressure within the eye.
What causes uveitis?
Possible causes of uveitis are infection, injury, or an autoimmune or inflammatory disease. Many times a cause can’t be identified. Uveitis can be serious, leading to permanent vision loss. Early diagnosis and treatment are important to prevent complications and preserve your vision.
What is cornea?
Listen to pronunciation. (KOR-nee-uh) The transparent part of the eye that covers the iris and the pupil and allows light to enter the inside.
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