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Chpt 6: A
Pig Disection: Sensory Organs
20
Biology
12th Grade
03/03/2013

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Term
Eyeball
Definition
Sense organ lodged within the socket of the skull
Term
Orbit
Definition
Socket of the skull where the eyeball is housed
Term
Upper and Lower Eyelids
Definition
Moveable structures that protect the eyeball and help keep its surface moist by spreading tears across it
Term
Nictitating Membrane
Definition
The third eyelid. It moves across the surface of the eyeball to keep it clean
Term
Conjunctiva
Definition
Delicate membrane lining the inner surface of the eyelids
Term
Lacrimal Glands
Definition
Tear glands producing watery secreting that flows over the surface of the eyeball moistening and cleaning it
Term
Nasolacrimal Duct
Definition
Duct that drains tears to the nasal passage
Term
Extrinsic Ocular muscles
Definition
Muscles that control movement of the eyeball as a whole
Term
Optic Nerve
Definition
Nerve leading from the eye to the brain
Term
Fibrous Tunic
Definition
One of the three layers of the eyeball; it is the outermost dense fibrous layer
Term
Sclera
Definition
Opaque portion of the fibrous tunic of the eyeball
Term
Cornea
Definition
Transparent part of the eyeball through which light enters; it is part of the fibrous tunic
Term
Choroid
Definition
Dark portion of the vascular tunic
Term
Retina
Definition
Whitish structure laying internally to the choroids; where light entering the pupils falls to form an inverted image
Term
Vitreous Body
Definition
Gelatinous structure which fills the large space between the lens near the front of the eyeball and the back wall of the eyeball
Term
Lens
Definition
Part of the eye responsible for focusing objects
Term
Ciliary Body
Definition
Holds the lens within the vascular tunic; it has somewhat of a pleated appearance
Term
Iris
Definition
An extension of the vascular tunic in front of the lens
Term
Pupil
Definition
Opening of the eye in the center of the iris; the diameter of this structure determines the amount of light entering into the eyeball
Term
Aqueous Humor
Definition
Watery substance feeding the anterior and posterior chambers of the eye
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