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Ear Anatomy

Outer elastic cartilage funnel used to collect sound waves and direct them toward the external acoustic/auditory meatus Auricle/Pinna
The rim of the auricle Helix
Elevation internal and parallel to helix Antihelix
Deep cavity bordered by antihelix Concha
Dorsal projection anterior to concha and over orfice of the meatus Tragus
A small tubercle opposite the tragus Antitragus
Directly below the antitragus, lacks cartilage Lobule/ear lobe
About 1 inch in length, extending from the concha to tympanic membrane/eardrum. External Acoustic Meatus
The outer 1/3 of the external acoustic meatus is what? Cartilage
The inner 2/3 of the external acoustic meatus pass through what? Temporal Bone
External acoustic meatus secretes what? Cerumen
Air filled space in temporal bone Tympanic Cavity
Lateral portion of the Tympanic Cavity Tympanic Membrane
Medial portion of the Tympanic Cavity Inner Ear
What connects to nasopharynx? Auditory Tube
3 small bones which transmit vibrations from the tympanic membrane to fluid in the inner ear Ossicles
What are the 3 bones which transmit vibrations from the tympanic membrane to fluid in the inner ear? malleus, incus, stapes
Hammer-shaped outermost ossicle Malleus
Anvil-shaped middle ossicle Incus
The malleus has a handle embedded in the what? Tympanic Membrane
Incus receives vibrations from the ____ and transmits them to the ___ Malleus; Stapes
Opening on medial wall leading from the tympanic cavity into the vestibule of the inner ear Oval Window(fenestra vestibuli)
What receives the base of the stapes? Oval Window(fenestra vestibuli)
Membrane covered hole in medial wall Round Window(fenestra cochleae)
Insertion of the Tensor Tympani muscle Into the Malleus
Innervatino of the Tensor Tympani muscle Mandibular division of trigeminal nerve (V3)
Action of the Tensor Tympani muscle Increases tension on the tympanic membrane thereby decreasing vibrations - acts as a damper to prevent damage
Insertion of the Stapedius muscle Into the Stapes
Innervation of the Stapedius muscle Facial (CN 7)
Action of the Stapedius muscle Decreases vibration, preventing excessive movement of the stapes
A branch of CN 7 passing through the middle ear just medial to the malleus. Innervates what? Chorda Tympani Nerve; Taste from the anterior 2/3rds of the tongue and some to the salivary glands.
Represents hollowed-out, fluid(perilymph) filled passageway in petrous portion of the temporal bone Osseous Labyrinth
Central portion of osseous labyrinth Vestibule
Makes up the Vestibule Oval Window and Round Window
Receives the foot plate of the stapes Oval Window
Covered with a membrane which accommodates changes in the fluid pressure of the perilymph Round Window
3 canals branching posterolateral from the vestibule Semicircular Canals
Branching antermedial, in the shape of a snails shell, from the vestibule Cochlea
Two osseous chambers of the cochlea Scala Vestibuli and Scala Tympani
Attached to vestibule and running to the helicotrema at the apex of the cochlea Scala Vestibuli
From the heliotrema to the round window Scala Tympani
Represents a tubular fluid(endolymph) filled passageway with membranous walls positioned inside the osseous labyrinth Membranous Labyrinth
Located in the vestibule and innervated by the vestibular nerve Saccule and Utricle
3 ducts attached to the utricle and located inside the semicircular canals Semicircular Ducts
The semicircular ducts are also innervated by what? Vestibular nerve
Attached to the saccule and located inside the cochlea, between the scala vestibuli and the scala tympani Cochlear Duct
Cochlear Duct is innervated by what? Cochlear nerve
Triangular cochlear duct is separated from the scala vestibuli on its superior surface by what? Vestibular Membrane
Cochlear duct is separted from the scala tympani on its inferior surface by what? Basilar Membrane
Resting on the upper surface of the basilar membrane is what which contains sensory what? Spiral Organ; hair cells for hearing
Equilibrium is maintained by what? Vestibular Apparatus
Vestibular Apparatus is comprised of Membranous Labyrinth: Saccule, Utricle and the Semilunar Ducts
Receptors for static equilibrium, termed ____ are located in the walls of the ____ and ____ Maculae; Utricle and Saccule
Created by: 1277880004



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