Ear/Cochlea slides labeled – Flashcards

vestibular membrane

Organ of Corti (contains: tectorial membrane, hair cells (inner and outer), stereocilia, supporting cells, basilar membrane, fibers of cochlear nerve)

Cochlear Nerve

Scala Vestibuli (contains perilymph/part of bony labyrinth)

vestibular membrane

stria vasularis (produces endolymph for #4)

Scala Media or Cochlear Duct (contains endolymph/part of membranous labryrinth)

basilar membrane (between cochlear duct and scala tympani, holds everything in place)

hair cells (between tectorial membrane and basilar membrane, surrounded by supporting cells)

stereocilia or hairs

Scala Tympani (contains perilymph/part of bony labryrinth)

spiral ganglion (cluster of afferent neuron cell bodies taking signals toward brain)

cochlea

semicircular canals

malleus (hammer) moved by tympanic membrane, articulates with incus (anvil)

temporal bone

pinna or auricle (outer fleshy ear, focuses sounds waves down the ear canal, subdivided into helix and lobule)

adipose

external auditory meatus (penetrates into the temporal bone)

tympanic membrane or tympanum (ear drum)

Eustachian tube or auditory tube (allows vibrations in middle ear to dissipate, inhibiting extensive reverberation)

external ear canal

malleus

incus

stapes (attached to oval window)

vestibule (consists of utricle and saccule, sense static equilibrium and linear acceleration by movement of otoliths in otolithic membrane against hair cells (stereocilia))

vestibular nerve

cochlear nerve

round window (at the end of scala tympani, allows for dissapation of sound waves after they've passed through entirety of cochlear chambers)

cochlea

Eustachian tube

inner ear region (consists of 2 labyrinth structures- outermost bony labyrinth and innermost membranous labyrinth, 3 regions of inner ear=cochlea, vestibule, and semicircular ducts)

middle ear region (between tympanum and cochlea/vestibule, includes eustachian tube, this main space called tympanic cavity)

external ear region

tympanic cavity

tympanic membrane (this large structure conducts sound to malleus, incus, and stapes, then to the oval window, this process magnifies the sound about 18 times)

Macula of Saccule

Saccule

Utricle

Macula of Utricle (sense static equilibrium, up vs. down)

Crista Ampularis of anterior semicircular canal

Cochlea

Round Window

stapes, oval window

Vestibule

Semicircular canals

Vestibulocochlear nerve

Incus (aka anvil)

Malleus (aka hammer, and attached to tympanic membrane)

tympanic membrane (aka eardrum)

9a = articulation site for stapes with incus 6 = tensor tympani muscle