The ear

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Lily

Cards (56)

What are all structures of the bone enclosed in
temporal bone
what is the only structure of the ear not enclosed in temporal bone
pinna
what is the role of the tympanic membrane
separate external acoustic meatus from middle ear
what does the external ear contain
auricle
external acoustic meatus
what is the auricle also known as
pinna
what is external acoustic meatus also known as
ear canal
what is the auricular cartilage made of
elastic cartilage
what is the role of the pinna
help funnel + concentrate vibrations in ear
assist in judging sound distance
how does the pinna help predators
hear small sounds
what is the role of external acoustic meatus
conduit sound waves to reach tympanic membrane
how is external acousitc meatus formed
incomplete cartilage tube annular cartilage
where does annular cartilage run from
auricle to tympanic membrane
what gland does external acoustic meatus contain
ceruminous gland
what does ceruminous gland secrete
cerumen (wax) to present dust reaching tympanic membrane
how can wax be moved to external ear
moving temporomandibular during chewing
what is middle ear known as
tympanic cavity
what shape is the middle ear
irregular
what is the lateral wall in the middle ear formed by
tympanic membrane
what is the roof + floor formed by in the middle ear
temporal bone
what is the middle ear cavity lined with
simple squamos epithelium
cuboidal epithelium
what is the role of Eustachian tube
connect middle ear to nasopharynx
maintain equal air pressure on both sides
what lines eutachian tube
ciliated epithelium
what is auditory ossicles
3 small bones lying across middle ear
what is the function of auditory ossicles
transmit vibrations by soundwaves from tympanic membrane to inner ear
auditory ossicles form a series of moveable joints
what shape is the malleus
hammer
what is the handle of the malleus in contact with
tympanic membrane
what does the head form in the malleus
moveable joint with incus
what shape is incus
anvil
where is incus found
lies in middle of 3 bones
what shape is the stapes
stirrup
what does the stapes head articulate
incus
where does the stapes footplate fit
in oval window
what is the medial wall
thin layer of temporal bone with 2 openings
what are the 2 openings in medial wall
oval window
round window
where does oval window lead to
inner ear
what is round window
fibrous membrane allowing fluid movement
what is the inner ear
cavity within temporal bone
what lines inner ear
periosteum
what does inner ear consist of
bony labyrinth
membranous labyrinth