What is the physiology of sclera?
The sclera provides mechanical structure, integrity and rigidity for the eye. The sclera has superficial tendon insertions of six extraocular muscles that cause eye movement. Small openings in the sclera are present for the blood vessels of the anterior and posterior ciliary arteries and vortex veins.
How the anatomy of the eye relates to its physiology?
A ring of muscular tissue, called the ciliary body, surrounds the lens and is connected to the lens by fine fibers, called zonules. Together, the lens and the ciliary body help control fine focusing of light as it passes through the eye. The lens, together with the cornea, functions to focus light onto the retina.
What is sclera in anatomy?
Listen to pronunciation. (SKLAYR-uh) The white layer of the eye that covers most of the outside of the eyeball.
What is the function of the sclera in the human eye?
The sclera is tough and fibrous, protecting the interior components of the eye from injury, and makes up the exterior coating of the eye. The sclera forms the entire visible white exterior of the eye, while the iris is the colored portion inside the anterior chamber of the eye.
What are the layers of sclera?
The four layers of the sclera from external to internal are episclera, stroma, lamina fusca, endothelium.
What is sclera and episclera?
The sclera is made up of three divisions: the episclera, loose connective tissue, immediately beneath the conjunctiva; sclera proper, the dense white tissue that gives the area its color; and the lamina fusca, the innermost zone made up of elastic fibers. There are a number of abnormalities associated with the sclera.
What is white part of the eye called?
Sclera. The white visible portion of the eyeball. The muscles that move the eyeball are attached to the sclera. Suspensory ligament of lens. A series of fibers that connects the ciliary body of the eye with the lens, holding it in place.
What organ is sclera present?
The sclera is the part of the eye commonly known as the “white.” It forms the supporting wall of the eyeball, and is continuous with the clear cornea.
What are the layers of the sclera?
Why is the sclera white?
The white of the eye – or the ‘sclera’ to give it its technical name – is the opaque, protective layer that encloses the entire eyeball, apart from the transparent cornea at the front of the eye. But in humans, our eyes may have evolved a white sclera since it made it easier to see which direction we’re looking in.
Does sclera have epithelium?
The sclera-corneal junction is called the limbus. Here, the deep surface of the suprachoroid lamina is covered by the scleral endothelium, a simple squamous epithelium. The sclera is nearly avascular, although it does have some visible blood vessels that pierce the surface to reach the retina below.