Eye/Ear/Special Senses Facts
The number of extrinsic eye muscles
What is 6?
The name of the delicate membrane that lines the eyelids and covers the outer surface of the eyeball
What is the conjunctiva?
What is the sclera?
The outer ear flap-like structure surrounding the opening to the auditory canal
What is the pinna?
The percent of sensory receptors found in the eyes
What is 70%?
The division of the ear that functions in both equilibrium and hearing
What is the inner ear?
The anterior of the eye that is transparent; a window through which light enters the eye
What is the cornea?
The snail shaped structure that uses hair cells to covert vibrations into nerve impulses
What is the cochlea?
The fraction of the eye's surface that can be seen
What are the vestibule and the semi-circular canals?
The glands that are above the lateral end of each eye and continually release a dilute saline solution through ducts
What are the lacrimal glands?
A flexible, biconvex crystal-like structure where light enntering the eye is focused
What is the lens?
The middle bone of the auditory ossicles
This "special sense" has to do with the body's sense of balance
What is equilibrium?
The collective name of the 3 bones located within the middle ear
What are the auditory ossicles?
The number of chambers in the eye
The gel-like liquid that is posterior to the lens and prevents the eye from collapsing inward
What is the vitreous humor? (Know the anterior fluid, too!)
The structure that runs obliquely downward from the middle ear, linking it with the throat
The three main anatomical divisions of the ear
What are the outer, middle, and inner ear?
The reflective inner lining of an animal's eye that helps it to see at night
What is the tapetum lucidum?
The three layers of the eye
What is the fibrous layer, the vascular layer, and the sensory layer (aka the retina)?
The innermost sensory layer of the eye where photoreceptors are located
What is the retina?
Commonly called the eardrum, sound waves hit this structure and cause it to vibrate
What is the tympanic membrane?
This waxy substance is secreted from glands within the walls of the ear (provides a trap for foreign bodies and repels insects)
What is cerumen?
The auditory canal is carved into what bone of the skull?
What is the temporal bone?
The area of the retina where no photoreceptors are located and objects disappear from view
What is the optic disc, or the blind spot?
What are rods and cones?
The structure that connects the stapes to the cochlea
What is the oval window? (you also need to know the other window!)