BIO 201: Special Senses Eyes and
Ears (Lab)-ASU-Questions and
Answers.
Conjunctiva - Answer transparent mucus membrane that covers the inner surface of the eyelid
and anterior surface of the eye, with the exception of the Cornea
Lacrimal apparatus - Answer lacrimal gland produces tears; tears flow through lacrimal
punctum, lacrimal canals, lacrimal sac, nasolacrimal duct; tears cleanse and lubricate the eye,
deliver oxygen and nutrients to the conjunctiva, and prevent bacterial infection via lysozyme
Flow of tears - Answer Lacrimal gland -> surface of eye -> lacrimal punctum -> lacrimal canals -
> lacrimal sac -> nasolacrimal duct
Extrinsic muscles of the eye - Answer Superior, Inferior, Medial, and Lateral rectus
Superior and Inferior Oblique
Superior rectus - Answer elevates eye, innervated by oculomotor III
Inferior rectus of eye - Answer depresses eye, innervated by oculomotor III
Medial rectus - Answer moves eye medially, innervated by oculomotor III
Lateral rectus - Answer moves eye laterally, innervated abducens VI
Superior oblique - Answer depresses and turns eye laterally, innervated by trochlear VI
Inferior oblique - Answer elevates and turns eye laterally, innervated by oculomotor III
Layers of the eye - Answer fibrous, vascular, inner
fibrous layer - Answer tunica fibrosa:
sclera, cornea
Sclera - Answer white of the eye, formed from dense collagenous CT; shapes eye and anchors
extrinsic muscles
, Cornea - Answer anterior transparent region that admits light that covers the pupil/iris
Vascular layer - Answer tunica vasculosa:
choroid, ciliary body, iris, pupil
Choroid - Answer highly vascular, deeply pigmented layer behind retina, helps absorb light and
provide nutrients to retina
Ciliary body - Answer thickened extension of choroid forming a muscular ring around the lens,
and shapes the lens via suspensory ligaments. Supports iris and secretes aqueous humor
Iris - Answer adjustable diaphragm that controls the diameter of the pupil
Pupil - Answer opening created by the iris which allows light to pass into the eye
Inner layer - Answer tunica interna:
retina, optic nerve
Retina - Answer cup-shaped extension of the diencephalon; contains a pigmented and a
neural (sensory) layer
Optic nerve - Answer Cranial Nerve II which innervates the eye; joins the retina at the optic
disc, crosses at the optic chiasm
Composition: sensory
Function: vision
Damage: blindness
Optic components - Answer transparent components of the eye that admit light rays, bend
lights, and focus them on the retina
posterior and anterior chamber, aqueous humor, lens, vitreous humor
Posterior chamber - Answer lies between the iris and lens
Anterior chamber - Answer lies between the cornea and the iris
Ears (Lab)-ASU-Questions and
Answers.
Conjunctiva - Answer transparent mucus membrane that covers the inner surface of the eyelid
and anterior surface of the eye, with the exception of the Cornea
Lacrimal apparatus - Answer lacrimal gland produces tears; tears flow through lacrimal
punctum, lacrimal canals, lacrimal sac, nasolacrimal duct; tears cleanse and lubricate the eye,
deliver oxygen and nutrients to the conjunctiva, and prevent bacterial infection via lysozyme
Flow of tears - Answer Lacrimal gland -> surface of eye -> lacrimal punctum -> lacrimal canals -
> lacrimal sac -> nasolacrimal duct
Extrinsic muscles of the eye - Answer Superior, Inferior, Medial, and Lateral rectus
Superior and Inferior Oblique
Superior rectus - Answer elevates eye, innervated by oculomotor III
Inferior rectus of eye - Answer depresses eye, innervated by oculomotor III
Medial rectus - Answer moves eye medially, innervated by oculomotor III
Lateral rectus - Answer moves eye laterally, innervated abducens VI
Superior oblique - Answer depresses and turns eye laterally, innervated by trochlear VI
Inferior oblique - Answer elevates and turns eye laterally, innervated by oculomotor III
Layers of the eye - Answer fibrous, vascular, inner
fibrous layer - Answer tunica fibrosa:
sclera, cornea
Sclera - Answer white of the eye, formed from dense collagenous CT; shapes eye and anchors
extrinsic muscles
, Cornea - Answer anterior transparent region that admits light that covers the pupil/iris
Vascular layer - Answer tunica vasculosa:
choroid, ciliary body, iris, pupil
Choroid - Answer highly vascular, deeply pigmented layer behind retina, helps absorb light and
provide nutrients to retina
Ciliary body - Answer thickened extension of choroid forming a muscular ring around the lens,
and shapes the lens via suspensory ligaments. Supports iris and secretes aqueous humor
Iris - Answer adjustable diaphragm that controls the diameter of the pupil
Pupil - Answer opening created by the iris which allows light to pass into the eye
Inner layer - Answer tunica interna:
retina, optic nerve
Retina - Answer cup-shaped extension of the diencephalon; contains a pigmented and a
neural (sensory) layer
Optic nerve - Answer Cranial Nerve II which innervates the eye; joins the retina at the optic
disc, crosses at the optic chiasm
Composition: sensory
Function: vision
Damage: blindness
Optic components - Answer transparent components of the eye that admit light rays, bend
lights, and focus them on the retina
posterior and anterior chamber, aqueous humor, lens, vitreous humor
Posterior chamber - Answer lies between the iris and lens
Anterior chamber - Answer lies between the cornea and the iris
