The Eye - Exercise 23
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
