THE EAR. External Ear Pinna External auditory meatus.

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Presentation transcript:

THE EAR

External Ear Pinna External auditory meatus

Middle Ear Malleus, Incus, Stapes Synovial Joints (between above bones) Tympanic membrane Round window Oval window Eustachian tube Nasopharynx

Inner Ear Semicircular canals Superior (frontal plane) Superior (frontal plane) Posterior (sagittal plane) Posterior (sagittal plane) Lateral (horizontal plane) Lateral (horizontal plane)Cochlea Vestibular nerve Choclear nerve

Ear Model Temporal bone (petrous ridge) Internal jugular vein Inner ear cavity Ampulla: lateral, superior, posterior UtricleSaccule

Pinna External acoustic meatus (the opening) External auditory canal Eustachian tube Internal Jugular vein

External acoustic meatus (the opening) Pinna External auditory canal Inner Ear Outer Ear Middle ear Eustachian tube

Ear Model Vestibular ganglion Bony cochlea Cochlear duct Scala vestibuli Organ of Corti Scala tympani

External acoustic meatus (the opening) External auditory canal Eustachian tube Semicircular canals: Posterior Superior Lateral Vestibulocochlear nerve

Cochlea Model Scala vestibuli Scala tympani Cochlear duct Vestibular membrane Basilar membrane Hair cells Tectoral membrane

Semicircular canals: Superior Posterior Lateral Utricle Saccule Cochlea Stapes Vestibulocochlear nerve

Vestibular nerve Cochlear nerve Vestibulocochlear nerve

Incus (anvil) Malleus (hammer) Stapes (stirrup) Semicircular canals Cochlea Vestibulocochlear nerve

Incus Malleus Tympanic membrane Cochlea Stapes Semicircular canals

Incus Malleus Stapes Semicircular canals Vestibulocochlear nerve Cochlea Utricle Saccule

Cross- section of cochlea Scala vestibuli scala media tectorial membrane hair cells scala tympani NOTE: the scala tympani is INFERIOR to the tectorial membrane; photos in some books may show this model upside down.

Cross-section of cochlea tectorial membrane hair cells

Ear Slide Basilar membrane Organ of Corti Tectorial membrane Scala tympani Scala vestibuli Cochlear duct Vestibular membrane Cochlear nerve fibers Spiral ganglion cells

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