The eye’s outer layer is made of dense connective tissue, which protects the eyeball and maintains its shape. It is also known as the fibrous tunic. The fibrous tunic is composed of the sclera and the cornea. The sclera covers nearly the entire surface of the eyeball.

What maintains the shape of the eye?

The large space behind the lens (the vitreous chamber) contains a thick, gel-like fluid called vitreous humor or vitreous gel. These two fluids press against the inside of the eyeball and help the eyeball keep its shape.

Which structure contains the muscles that adjust the shape of the lens of the eye?

CILIARY BODY:

The ciliary body is attached to the outer edge of the iris near the wall of the eye. The ciliary body produces the fluid (aqueous humor) that fills the eye and nourishes its structures. It also helps to change the shape of the lens when focusing occurs.

What structure is part of the innermost layer of the wall of the eye quizlet?

What is the innermost layer of the eye called? The retina. Innermost layer of tissue at the back of the eye containing photoreceptors.

Where is the vitreous body located?

The vitreous body lies at the back of the eye, between the lens and the retina.

Which part of the eye nourishes the eye itself and maintains its spherical shape?

Sclera. The sclera is commonly called the “white of the eyes.” It’s the tough outer layer of the eye, made of collagen to help the eye maintain its shape.

What part of the eye protects the eye?

The sclera (SLEER-uh) is the protective layer. This tough, fibrous tissue surrounds the eyeball and attaches to the cornea, which is the clear front surface of the eye. What we see as the white of the eye is the sclera. Over the sclera lies the conjunctiva, a clear skin layer that protects the eye from becoming dry.

What structure changes the shape of the lens?

The ciliary body is a circular structure that is an extension of the iris, the colored part of the eye. The ciliary body produces the fluid in the eye called aqueous humor. It also contains the ciliary muscle, which changes the shape of the lens when your eyes focus on a near object.

How does the shape and structure of the lens relate to its function in the eye?

Behind the iris sits the lens. By changing its shape, the lens focuses light onto the retina. Through the action of small muscles (called the ciliary muscles), the lens becomes thicker to focus on nearby objects and thinner to focus on distant objects.

What is the structure within the eye that holds the lens in place quizlet?

suspensory ligaments that holds the lens in place.

Which of the following structures is an accessory structure of the eye?

The accessory structures of the eyes include the eyelids, the eyebrows, the ocular muscles, the fasciae, the lacrimal apparatus, and the conjunctiva. The conjunctiva is a mucous membrane that lines the inner surface of the eyelids and part of the front of the eyes (sclera), helping to keep the eyes lubricated.

What structures keep the retina in place and helps to maintain eyeball shape?

Along with maintaining the shape of the eye, the vitreous helps absorb shocks to the eye and keeps the retina properly connected to the back wall of the eye. Light passes through the vitreous on its way to the retina.

What composes the outer layer of the wall of the eye quizlet?

The eye is made up of three layers: the outer layer called the fibrous tunic, which consists of the sclera and the cornea; the middle layer responsible for nourishment, called the vascular tunic, which consists of the iris, the choroid, and the ciliary body; and the inner layer of photoreceptors and neurons called the

Which structure divides the internal chamber of the eye into anterior and posterior segments?

The iris divides the eye into the anterior and posterior segments.

Which of the following is a structure of the fibrous layer?

The fibrous layer, which consists of the sclera and cornea. The sclera is an opaque layer which surrounds the posterior five-sixths of the eyeball. The cornea is a transparent layer that is anteriorly continuous with the sclera, occupying the anterior one-sixth of the eyeball.

What produces vitreous humor?

It is produced by the non-pigmented cells in the ciliary body. The vitreous humor fills the space (called vitreous chamber) between the lens and the retina of the eyeball.

What are 4 structures that protect the eye?

The orbit, eyelashes, eyelids, conjunctiva, and lacrimal glands help protect the eyes.

What regulates the shape of the lens?

The lens is flexible and its curvature is controlled by ciliary muscles through the zonules. By changing the curvature of the lens, one can focus the eye on objects at different distances from it.

Which structure focuses incoming light onto the retina?

Lens: a transparent structure situated behind your pupil. It is enclosed in a thin transparent capsule and helps to refract incoming light and focus it onto the retina.