The Ear Flashcards
What substances are in the inner, middle, outer ear respectively?
Fluid
Air
Air
Which 2 structures make us the outer ear?
Pinna
Auditory canal
Function of the pinna?
Cartilaginous flap
Direct sound waves to opening
Function of auditory canal?
Passes through bone to eardrum
Conducts sound waves from pinna to eardrum
Which 6 structures make up the middle ear?
Tympanum Hammer Anvil Stirrup Eustachian tube Oval window
Function of tympanum?
Thin membrane, cover opening
Vibrates when sound hits
Function of hammer?
Malleus
Articulate to transmit
Function of anvil?
Ineus
Amplify vibrations to oval window
Function of stirrup?
Stapes
Amplify vibrations to oval window
Function of Eustachian tube?
Connect middle ear to throat
Equalizes pressure so membranes vibrate freely
Function of oval window?
Separate middle and inner ear
Pass vibrations therefore waves in perilymph
Which 6 structures make up inner ear?
Bony labyrinth Membranous labyrinth Scalas Membranes Organ of corti Auditory nerve
What is the function of the bony labyrinth?
Temporal Bone
Perilymph fluid
Function of membranous labyrinth?
Floats in perilymph
Endolymph fluid
Function of scalas?
Middle cholea= scala media (endolymph)
Upper scala vestibuli= lower scala tympani (bony labyrinth)
Lower scala tympani= to round window