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37 Cards in this Set
- Front
- Back
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Accessory structures of the eye
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1. Eyelids
2. Eyelashes/eyebrows 3. Lacrimal apparatus 4. Extrinsic eye muscles |
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palpebrae
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eyelids
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Function of eyelids
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Shade the eyes during sleep, protect from excess light and foreign objects, and spread lubricating solutions over eyeballs
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Which eyelid is more movable?
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upper
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muscle that moves the upper eyelid
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levator palpebrae superioris
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thick fold of connective tissue that gives form and support to eyelids
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tarsal plate
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elongated modified sebaceous glands
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tarsal or Meibomian glands
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thin, protective mucous membrane composed of nonkeratinized cells that is supported by areolar connective tissue
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conjunctiva
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lines inner aspects of eyelids
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palpebral conjunctiva
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passes from eyelids onto surface of the eyeball, where it covers sclera but not cornea
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bulbar conjunctiva
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Cause of bloodshot eyes
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dilation and congestion of blood vessels of bulbar conjunctiva due to local irritation or infection
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protect the border of each eyelid
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eyelashes
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protect the eyeballs from foreign objects, perspiration, and direct rays of sun
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eyebrows
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release a lubricating fluid into follicles and is located near eyelashes
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sebaceous ciliary gland
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group of structures that produces and drains tears
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lacrimal apparatus
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tears pass into these ducts that lead into lacrimal sac
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lacrimal canals
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carries lacrimal fluid into nasal cavity
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nasolacrimal duct
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supplies lacrimal glands
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facial nerves
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lacrimal fluid
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salts, mucus, lysozyme
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function of lacrimation
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wash away irritating substances
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Extrinsic eye muscles
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1. Superior/inferior rectus
2. Lateral/medial rectus 3. Superior/inferior oblique |
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supply extrinsic eye muscles
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cranial nerves III, IV, or VI
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Eyeball cavities
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1. Anterior
2. Visceral |
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Layers of wall of eyeball
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1. Fibrous tunic
2. Vascular tunic 3. Retina |
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superficial layer of eyeball that consists of anterior cornea and posterior sclera
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fibrous tunic
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transparent coat that covers colored iris
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cornea
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helps focus light onto retina
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cornea
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Liquid found in anterior cavity
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aqueous humor
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Liquid found in posterior cavity
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vitreous humor
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located behind the cornea and in front of the iris and drains aqueous humor
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anterior chamber of anterior cavity
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located behind the iris and is the source of the humor
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posterior chamber of anterior cavity
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What happens when ciliary muscles contract?
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the lens become thicker
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Where are the most cones located?
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fovea
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layer of dense connective tissue made up of mostly collagen fibers and fibroblasts and covers entire eyeball except for cornea
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sclera
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sinus that aqueous humor drains into
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scleral venous sinus (canal of Schlemm)
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Parts of vascular tunic
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1. Choroid
2. Ciliary body 3. Iris |
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highly vascularized and lines most of internal surface of sclera
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choroid
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