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The eye is a sphere-shaped structure, approximately 1 inch in diameter. Most of the eyeball itself is not visible, but rather is located within a socket in the skull. This socket is called the _____. Orbit
The _________ is located within the orbit on the side of the eye. Lacrimal gland
The outer portion of the eye is covered by two protective flaps (the upper and lower eyelids) comprised of ____, ____, ____, and ____ skin, muscle, connective tissue, and conjunctiva.
The _____ includes the cornea and the sclera. outer tunic
____ is the outer transparent covering of the eye. It is primarily composed of connective tissue. Cornea
The _____ is the white portion of the eye, which is made of a tough fibrous tissue that is resistant to stretching and tearing. sclera
The sclera is covered with a thin mucous membrane layer known as the ______, which also lines the inner surface of the eyelids conjunctiva
This layer has a rich supply of blood vessels. The _____ contains the choroid coat, ciliary body, iris, and lens. middle tunic
The _____ is the thickest part of the middle tunic. It extends forward from the choroid coat, and forms a ring around the anterior portion of the eyeball ciliary body
The ____ is composed of both connective tissue and smooth muscle fibers. These fibers give the eye the distinctive color that you can see from the exterior of the body. iris
The center opening of the iris is called the _____. pupil
The _____ is located posterior to the iris. This is a transparent portion of the eye that is held in position by fibers called “suspensory ligaments.” lens
The _____ contains only one primary structural component of the eye– the retina. inner tunic
The retina is composed of visual receptor cells called “______.” These receptor cells include two distinct types of receptor cells: rods and cones photoreceptors
The nerve fibers of the retina join to the optic nerve at an area called the ____. optic disk
True or False? The human eye contains approximately 100 million rods and 3 million cones. True
The _____ is the pathway of vision. It extends from the optic disk along nerve pathways to the brain. optic nerve
This chamber is filled with a watery fluid called “_______.” ______ also fills the space between the cornea and the lens to help provide nourishment to these parts. Aqueous humor
The______ is the area of the eye that is occupied by the lens. posterior chamber
The largest portion of the eye is the _____ (also referred to as the posterior cavity), which is located behind the lens. vitreous body
This substance is responsible for supporting the internal structures of the eye as well as ensuring that the eyeball maintains its round shape. vitreous humor
The eye is protected from exterior particles by the _____ and _____ . eyelids and lacrimal glands
Created by: jhey33