AP1 Lab CH6

which cranial nerves innervates the extrinsic muscles of the eye to stimulate eyeball movement?

- III occulomotor - IV trochlear - VI abdmones

which of the eye structures are refractory media-- that is, which structures can bend light as light passes through them?

- cornea - aqueous humor - lens - viterous humor

what is the function of the lacrimal gland? why is it located in the superior and lateral portion of the orbit?

- makes tears to cleanse and lubricate eyes - use gravity and yields to distribute tears over eyes.

Is the retina attached to the inside of the eyeball over its entire surface? if not, where is it attached? in the intact eyeball, what holds the retina against the surface of the choroid?

- no, at the optic disc - viterous humor

note the structure through which light passes to reach the retina. write these structures in order.

-cornea -aqueous humor -pupil, lens -viterous humor

which layer of the eyeball is the toughest? which layer is the most delicate?

1. fibrous (sclera, cornea) 2. retina

which cranial nerve transmits the impulse for balance and equilibrium to the brain?

CN VIII specifically the vestibular part

where are the receptors located that provide information about dynamic equilibrium and balance during change of position?

dynamic equilibrium- semicircular canals, static equilibrium- utricle and saccule.

which of these refractory media is an adjustable refractory medium?

lens

exactly where is the nerve impulse generated in the ear?

organ of corti

how can a sore throat and chronic inflammation affect ones ability to hear?

pressure in the eustachian tube because it cant open fully- this causes muffled hearing

which cranial bone houses the structures involved in hearing and balance?

temporal

each sense is designed to convert a particular stimulus into the transmission of a nerve impulse. in hearing, what is the original stimulus?

vibrations of sound waves