A&P I Anatomy and physiology I BIO 131 Utica College Cow Eye Dissection PDF

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A&P I Anatomy and physiology I BIO 131 Utica College Cow Eye Dissection...

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Cow Eye Dissection & Identification Week 7 BIO 131 Lab Using the following word bank label the cow eye images to submit along with the pre-lab and discussion questions. Sclera Cornea Iris Pupil

Optic Nerve Optic Disc Ciliary Body Lens

Choroid Tapetum Lucidum Retina

Tapetum Lucidum

Retina

Lens

Optic disc

Sclera

Cornea

Optic nerve

Ciliary body

Iris

Pupil

Choroid

Not Pictured: Macula Lutea & Fovea Centralis Aqueous & Vitreous Humors Please give a brief description of the location and function of these structures within the eye.

Macula Lut Lute e a: o o o o o o o o o o o o o

Macula lutea is located in the central retina area lateral, or to the side of, the optic nerve, and processes only light that comes from the center of the visual field It is specialized for high acuity vision Contains mostly cones and few rods An oval yellowish spot near the center of the retina of the human eye Diameter of about 5 mm Frequently histologically defined as having two or more layers of ganglion cells At its center is the fovea, a small pit that contains the largest concentration of cone cells in the eye & is responsible for central vision; also contains the parafovea and perifovea An oval yellowish spot near the center of the retina of the human eye Diameter of about 5 mm Macula lutea’s bloody supply comes from the choroid Damage to the macula lutea will result in loss of central vision & this loss of central vision is typically obvious immediately Frequently histologically defined as having two or more layers of ganglion cells Within the macula lutea are fovea and foveola that have a high density of cones

Fovea Ce Cent nt ntrr alis: o o o o o

Tiny pit in the in the center of the macula lutea; contains only cones and no rods Within the macula lutea are fovea and foveola that have a high density of cones ▪ The cones are photoreceptors with high acuity An indented area located on the retina of the eye, in the center of the macula, or macula lutea Doesn’t contain blood supply Fovea centralis has a specialized form of vision to give a better vision with NO interference of any other cells like ganglion & bipolar cells

Aqueous H Humor: umor: o o o o o o o o o o o o

Clear, watery fluid filling the anterior chamber/compartment of the eye Secreted by ciliary body & circulates, providing lubrication for the iris, before being resorbed into the bloodstream ▪ Flows from ciliary body into anterior chamber, out through the trabecular meshwork & into a drainage canal The clear liquid under the cornea is the aqueous humor; low protein concentration Clear fluid that helps the cornea keep its rounded shape Made of mostly of water and keeps the shape of the cornea Brings nutrients to the eye Provides the cornea with inflation which helps the cornea to expand → increased protection against small debris (e.g.: dust, pollen, etc.) & some pathogens Helps keep eye moist; helps prevent the eye from getting dry Maintains intraocular pressure Helps give the eye its shape by giving the eye some pressure as it helps expand the eye ball Hydrostatic pressure keeps the eyeball’s walls firm & maintains the eyeball’s spherical shape Necessary for refractive index

Vitreous Humo Humorr (Vitreous Body): o o o o o o o o

Clear gelatinous fluid substance filling the posterior chamber/compartment of the eyeball that transmits light Back of the eye is filled with a clear jelly-like liquid that is a mixture of protein and water, called vitreous humor; it’s clear so light can pass through it Vitreous humor is formed during the eye’s development & is not replenished Hyaloid fossa is an indentation in the anterior portion of the vitreous humor that helps hold the lens in place Posteriorly the vitreous humor serves to hold the retina in place Holds the neural retina firmly against the pigmented layer & helps to support the overall eyeball Contributes to intraocular pressure Thick, clear jelly-like liquid substance that helps give the eyeball its shape as it helps the eyeball maintain its shape...