Anatomy Chpt 12 part 2

blocks light and protects the eye from foreign bodies.

• eyelids (palpebrae)

• conjunctiva

• eyelashes

• tarsal glands

glands which lie along the thickened area at the edge of the eye, secrete oil to slow the evaporation of tears

• tarsal glands

• lacrimal glands

• nasolacrimal duct

• palpebral fissure

a transparent mucous membrane that lines the inner surface of the eyelid and covers the anterior surface of the eyeball.

• conjunctiva

• tarsal plate

• palpebrae

• lacrimal

small gland that secretes tears that flow onto the surface of the conjunctiva.

• lacrimal gland

• nasolacrimal duct

• tarsal gland

• palpebral fissure

Formed from dense connective tissue- is the outermost layer of the eye. mostly white and opaque; it forms what is called the white of the eye.

• cornea

• sclera

• ciliary body

• choroid

ring of colored muscle, it works to adjust the diameter of the pupil

• sclera

• iris

• choroid

• retina

Thin layer of light sensitive cells that lines the posterior two thirds of the eye.

• ciliary body

• retina

• cornea

• lense

Reorder the following steps in the process of vision

• light must enter the eye and focus on the retina toproduce a tiny upside down image of the object being viewed.

• the photoreceptors in the retina must convert that image into nerve impulses

• the impulses must be transmitted to the brain for interpretation

Light rays entering the eye must be bent so they focus precisely on the retina. bending of the light rays

• refraction

• convergence

• constriction

• accommodation

Lines up the visual axis of each eye toward the object so that the light rays fall on the corresponding spots on each retina

• convergence

• constriction

• dilation

• refraction