The Eye - Exercise 23

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macula lutea and fovea centralis

area of the retina where cones are most concentrated.

a. sclera b. choroid c. retina d. ora serrata e. lens f. posterior segment g. scleral venous sinus h. posterior chamber i. anterior chamber j. cornea k. Iris l. ciliary zonule m. ciliary process n. ciliary muscle.

Identify

medial commissure

Palpebral fissure angle that is nearer the nasal bone

conjunctivae

a clear mucous membrane that lines the eyelids and the anterior white of the eye

Iris

a ring of muscle tissue that forms the colored portion of the eye around the pupil and controls the size of the pupil opening

scleral venous sinus

drains the aqueous humor from the eye

lacrimal caruncle

fleshy elevation at the medial commissure; produces a whitish oily secretion

choroid

middle, vascular layer of the eye, between the retina and the sclera

Tarsal Glands

modified sebaceous glands associated with the eyelid edges. Secretes an oily substance that lubricates the eye.

Lateral commisure

outer corner of eye

nasolacrimal duct

passage from the lacrimal sac to the nose

fovea centralis

pinpoint depression in the center of the macula lutea that is the site of sharpest vision

optic disc

Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it contains only nerve fibers, no rods or cones, and is thus insensitive to light.

ciliary body

Structure surrounding the lens that connects the choroid and iris. It contains ciliary muscles, which control the shape of the lens, and it secretes aqueous humor.

Sclera Cornea

Structures of the fibrous outer layer:

Photoreceptors Bipolar Ganglion

The three layers of cells within the retina

Choroid Ciliary Body Iris

The three structures of the Vascular middle (uvea) layer

pigmented epithelial layer Retina

The two structures of the Inner nervous layer

lacrimal punctum

Tiny opening on the edge of each eyelid through which tears drain.

aqueous humor

fluid in the eye, found between the cornea and the lens

ciliary processes of the ciliary body

form the aqueous humor

lacrimal gland

gland located in the upper lateral region above the eyeball that secretes tears

vitreous humor

jellylike substance found behind the lens in the posterior cavity of the eye that maintains its shape

lacrimal sac

structure that collects tears before emptying into the nasolacrimal duct

retina

the light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information

lacrimal apparatus

the structures that produce, store, and remove tears

cornea

the transparent layer forming the front of the eye.

Lens

the transparent structure behind the pupil that changes shape to help focus images on the retina

fovea centralis

tiny pit or depression in the retina that contains only cones and is the region of greatest visual acuity.

Palpebrae

upper and lower eyelids

sclera

white of the eye


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