1 / 24

Hearing and Equilibrium

Hearing and Equilibrium. Auditory sensations and Equilibrium. Hearing and equilibrium rely on mechanoreceptors The ear is divided into three parts: Outer ear Middle ear Inner ear. Outer ear: Ceruminous glands – Cerumen - ear wax in external auditory meatus Middle ear:

jana-barlow
Download Presentation

Hearing and Equilibrium

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hearing and Equilibrium

  2. Auditory sensations and Equilibrium Hearing and equilibrium rely on mechanoreceptors The ear is divided into three parts: Outer ear Middle ear Inner ear

  3. Outer ear: Ceruminous glands – Cerumen - ear wax in external auditory meatus Middle ear: Tympanic antrum – opening into mastoid process Auditory (Eustachian) Tube Otitis media – inflammation of the MIDDLE ear Auditory ossicles or ear bones

  4. Tensor tympani muscle Stapedius muscle Tympanic reflex INNER EAR : Cochlea – hearing Vestibule – static equilibrium Semicircular canals – dynamic equilibrium

  5. Organ of Corti Vestibulocochlear nerve – cranial nerve VIII Audible range: 20 -- 20,000 hertz Ossicles amplify sound 22 X Some nerve fibers cross over to opposite side of brain; some don’t. Why?

  6. Equilibrium – Balance Static equilibrium – maintenance of body posture relative to gravity while the body is still. Dynamic equilibrium – maintenance of the body posture (mainly the head) in response to sudden movements. Tracking a moving object.

  7. Static Equilibrium Inside the vestibule are two chambers : utricle and saccule. Regions of hair cells and supporting cells called maculae. Otoliths – “ear rocks”

  8. Dynamic Equilibrium Semicircular canals In ampulla is the crista ampullaris – contains hair cells and supporting cells covered by a gelatinous mass called the cupula. Neurological connections between eyes and semicircular canals – for tracking Nystagmus

More Related