A&P 2 Practical 2; Anatomy of the Eye
lacrimal canaliculi function
Allow lacrimal fluid to drain into lacrimal sac
Lacrimal sac function
Allow lacrimal fluid to drain into nasolacrimal duct
Lacrimal punctum function
Allow lacrimal fluid to drain into superior and inferior lacrimal canaliculi
nasolacrimal duct function
Allows lacrimal fluid to flow into nasal cavity
Iris
Anterior portion of vascular layer; pigmented
What fluid is found in anterior cavity?
Aqueous humor
choroid
Blood vessel rich dark membrane
ciliary processes function
Capillaries of ciliary process form aqueous humor by filtering plasma
posterior cavity
Ciliary body and ciliary process
Ciliary Body Function
Contain ciliary muscle and ciliary processes
lacrimal caruncle
Fleshy reddish elevation that contains sebaceous and sweat glands
Ciliary zonule (suspensory ligament)
Halo of fine fibers attaches lens to ciliary process
sclera function
Helps to maintain shape of eyeball, provides attachment point for extrinsic eye muscles
Sclera
Opaque white connective tissue forms white of the eye
Pupil
Opening in the center of the iris
Eyelids (palpebrae) function
Protect the eyes Spread lacrimal fluid (tears) with blinking
ciliary processes
Radiating folds within the ciliary body.
Lacrimal gland function
Secretes lacrimal fluid which contains mucus, antibodies, and lysozyme
Conjunctiva function
Secretes mucus to lubricate the eye
lacrimal caruncle function
Secretes whitish poly secretion for lubrication of the eye
Lacrimal sac
Single pouch located in medial orbital wall
nasolacrimal duct
Single tube that empties into nasal cavity
Eyelids (palpebrae)
Skin-covering upper and lower lids, with eyelashes projecting from their free margin
Astigmatism chart
Tests for unequal curvatures of lens and/or cornea
Fovea
The central focal point in the retina, around which the eye's cones cluster.
Lens
The transparent structure behind the pupil that changes shape to help focus images on the retina.
lacrimal canaliculi
Two tiny canals located in eyelids
lacrimal punctum
Two tiny openings on medial margin of each eyelid
Optic Nerve (II)
Vision
What fluid is found in posterior cavity?
Vitreous humor
macula lutea
a yellowish central area of the retina that is rich in cones and that mediates clear detailed vision
pupil function
allows light to enter the eye
cornea function
bends light
choroid function
blood supply; melanin absorbs excess light
vascular layer of eye
choroid, ciliary body, iris
Cornea
continuous with sclera but thin and clear
iris function
controls the amount of light entering the eye by changing size of pupil
anterior cavity
cornea to lens
ciliary body
encircles the lens
anterior segment
filled with aqueous humor
posterior segment
filled with vitreous humor
anterior chamber
fluid-filled space between the cornea and iris
Lacrimal gland
gland located in the upper outer region above the eyeball that secretes tears
conjunctiva
mucous membrane that lines the eyelids and outer surface of the eyeball
conjunctivitis
pinkeye; inflammation of the conjunctiva
fibrous layer of eye
sclera and cornea
vitreous humor
soft, jelly-like material behind the lens in the viterious chamber, helps maintain shape of eyeball
posterior chamber
space between the back of the iris and the front of the vitreous chamber; filled with aqueous humor
Snellen eye chart
tests visual acuity
ora serrata
the serrated boundary between the ciliary muscle and the retina
aqueous humor
watery liquid found in the anterior cavity of the eye
optic disk (blind spot)
where the optic nerve leaves the eye