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The eyes are the receptor organs of sight, and their functions are to receive images and transmit them to the brain.Oculus means eye, and the plural is oculi

STRUCTURES OF THE EYESThe structures of the eye include the eyeball and the adnexa that are attached to or surround the eyeball

The Adnexa of the EyesThe adnexa of the eyes, also known as adnexa oculi, are the structures outside the eyeball. These include the orbit, eye muscles, eyelids, eyelashes, conjunctiva, and lacrimal apparatus.(ad-NECK-sah)

The Orbit

The orbit, also known as the eye socket, is the bony cavity of the skull that contains and protects the eyeball and its associated muscles, blood vessels, and nerves.

Muscles of the eyes Six major eye muscles, which are arranged in three pairs, are attached to each eye.These are the:Superior and inferior oblique musclesSuperior and inferior rectus musclesLateral and medial rectus muscles

These muscles make a wide range of very precise eye movements possible. Oblique describes an angle that is slanted but is not perpendicular or parallel. Rectus means straight.

The upper and lower eyelids, together with the eyebrows and eyelashes, help protect the eyeball from foreign matter, excessive light, and injuries due to other causes.

The canthus (KAN-thus) is the angle where the upper and lower eyelids meet (canth means corner of the eye, and -us is a singular noun ending) (plural,canthi).

The cilia (SIL-ee-ah), which are small hairs, make upthe eyebrows and eyelashes. Cilia are also present inthe nose to prevent foreign matter from being inhaled

The tarsus (TAHR-suhs), also known as the tarsal plate, is the framework within the upper and lower eyelids that provides the necessary stiffness and shape (tars means edge of the eyelid, and -us is a singular noun ending) (plural, tarsi)

The conjunctiva (kon-junk-TYE-vahIs the transparent mucous membrane that lines the underside of each eyelid and continues to form a protective covering over the exposed surface of the eyeball

The lacrimal apparatus (LACK-rih-mal)Also known as the tear apparatus, consists of the structures that produce, store, and remove tears. Lacrimation is the secretion of tears.

The lacrimal glands, which secrete lacrimal fluid (tears), are located on the underside of the upper eyelid just above the outer corner of each eye

The function of lacrimal fluid, commonly known as tears, is to maintain moisture on the anterior surface of the eyeball. Blinking distributes the lacrimal fluid across the eye.

The lacrimal canal consists of a duct at the inner corner of each eye. These ducts collect tears and empty them into the lacrimal sacs. Crying is the overflowing of tears from the lacrimal canals.

The lacrimal sac, also known the tear sac, is an enlargement of the upper portion of the lacrimal duct.

The lacrimal duct, also known as the nasolacrimal duct, is the passageway that drains excess tears into the nose.

The EyeballThe eyeball, also known as the globe, is a 1-inch sphere with only about one-sixth of its surface visibleThe term optic (OP-tik) means pertaining to the eye or sight (opt means sight, and -ic means pertaining to).

Ocular (OCK-you-lar) means pertaining to the eye (ocul means eye, and -ar means pertaining to).

Extraocular (eck-strah-OCK-you-lar) means outside the eyeball (extra- means on the outside, ocul means eye, and -ar means pertaining to).

Intraocular (in-trah-OCK-you-lar) means within the eyeball (intra- means within, ocul means eye, and -ar means pertaining to).

Walls of the EyeballThe walls of the eyeball are made up of three layers: the sclera, choroid, and retina

The sclera (SKLEHR-ah)Also known as the white of the eye, maintains the shape of the eye and protects the delicate inner layers of tissue. This tough, fibrous tissue forms the outer layer of the eye, except for the part covered by the cornea.

The choroid (KOH-roidAlso known as the choroid coat, is the opaque middle layer of the eyeball that contains many blood vessels and provides the blood supply for the entire eye.

The retina (RET-ih-nah)Is the sensitive innermost layer that lines the posterior segment of the eye. The retina receives nerve impulses and transmits them to the brain via the optic nerve.

oculusForvoPronunciation in Ingls2507.756und - http://www.forvo.com/word/oculus/#enhttp://www.forvo.com/license/adnexalForvoPronunciation in Ingls2429.3884und - http://www.forvo.com/word/adnexal/#enhttp://www.forvo.com/license/orbitForvoPronunciation in Ingls2298.7756und - http://www.forvo.com/word/orbit/#enhttp://www.forvo.com/license/eyelidsForvoPronunciation in Ingls2560.0012und - http://www.forvo.com/word/eyelids/#enhttp://www.forvo.com/license/eyebrowsForvoPronunciation in Ingls1906.938und - http://www.forvo.com/word/eyebrows/#enhttp://www.forvo.com/license/canthusForvoPronunciation in Ingls2507.756und - http://www.forvo.com/word/canthus/#enhttp://www.forvo.com/license/ciliaForvoPronunciation in Ingls2612.2463und - http://www.forvo.com/word/cilia/#enhttp://www.forvo.com/license/conjunctivaForvoPronunciation in Ingls2324.8982und - http://www.forvo.com/word/conjunctiva/#enhttp://www.forvo.com/license/lacrimalForvoPronunciation in Ingls2612.2463und - http://www.forvo.com/word/lacrimal/#enhttp://www.forvo.com/license/tearsForvoPronunciation in Ingls2507.756und - http://www.forvo.com/word/tears/#enhttp://www.forvo.com/license/lacrimationForvoPronunciation in Ingls2638.369und - http://www.forvo.com/word/lacrimation/#enhttp://www.forvo.com/license/opticForvoPronunciation in Ingls2612.2463und - http://www.forvo.com/word/optic/#enhttp://www.forvo.com/license/ocularForvoPronunciation in Ingls1724.0809und - http://www.forvo.com/word/ocular/#enhttp://www.forvo.com/license/intraocularForvoPronunciation in Ingls1776.3258und - http://www.forvo.com/word/intraocular/#enhttp://www.forvo.com/license/scleraForvoPronunciation in Ingls2560.0012und - http://www.forvo.com/word/sclera/#enhttp://www.forvo.com/license/choroidForvoPronunciation in Ingls2560.0012und - http://www.forvo.com/word/choroid/#enhttp://www.forvo.com/license/retinaForvoPronunciation in Ingls2324.8982und - http://www.forvo.com/word/retina/#enhttp://www.forvo.com/license/


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