Card Set Information
ear nose mouth eye
layers of the eye
1) fibrous tunic- outmost
2) vascular tunic- middle w/ blood vessels
3) retina- sensory tunic- innermost with neurons and receptors
fibrous tunic consists of
cornea -outer layer covering eye
sclera- white of eye
vascular tunic structures?
1) choroid- poster 2/3 of eye
2) ciliary body- consists of ciliary muscle, ciliary process, suspensory ligament
4) iris- part with color which also contains pupil and circulatory smooth muscle and radial smooth muscle
function of muscles in iris?
radial muscle- relaxes to dilate pupil
circular muscle- relaxes to constrict pupil
what makes the aqueous humor?
what causes glaucoma?
the closing of canal of schlemm which increases pressure on eye
what vitamin is needed for rhodopsin?
positive and negative afterimage?
positive afterimage is when you shut your eyes adn you see images after you have looked at an object
negative afterimage is when the image starts to change shape or color when you have your eyes shute
why night blindness?
its r/t a lack of vit A so the rods cant fire and you only see black /white and ther are no grey tones.
external ear consists of what structures?
1) Auricle/pinna- outer ear you see
2) external auditory meatus- the tube runnign into ear
3) tympanic membrane- small membrane in middle ear
What are the structures of the middle ear?
1) auditory ossicles- 3 small bones in middle ear (malleus, incus, stapes)
2) oval window- directly under stapes
3) roudn window- under stapes but superior to oval window
4) auditory tube- tube leading to throat.
Structures in Internal ear?
1) bony labyrinth- walls of inner ear that are filled with fluid called perilymph. Inside this region are a) vesicles b) semicircular canals c) cochlea
2) membranous labyrinth- filled with fluid called endolymph. Inside this region are a) utricle and b) saccule which are located in the vestibule. c) semicircular canals are located in
semicircular canal and d) cochlear ducts are located in cochlea.
3) vestibulocochlear nerve leads to the above structures and pick up sensory information
structures in cochlea duct?
spiral organ of corti which contains
1) hair cells
3) supporting cells
4) tectorial membrane
where are crista located?
cranial nerves invoved in taste?
facial nerve XII
Glossoharyngeal nerve IX
Vagus nerve X
what are the bumps on your tongue called?
cochlear duct with endolymph
external auditory meatus
scala tympani with perilymph
scala vestibule with perilymph
spiral organ of corti
axons of ganglion cells