Anatomy Lecture - Ear Champney

8/3/2019 Anatomy Lecture - Ear Champney

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HUMAN GROSS ANATOMY:

Ear


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I. External Features

A. Auricle (Pinna)

1. helix

2. antihelix

3. tragus

4. antitragus

5. concha

6. external auditory meatus


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A. Auricle (Pinna)

7. anterior, posterior and superior auricular muscles

8. motor nerves - facial nerve (VII)

9. sensory nerves

a) auriculotemporal branch of

trigeminal nerve (V3)

b) great auricular and lesseroccipital nerves

10. blood supply - superficial

temporal and posterior auricular

arteries


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B. External Auditory Meatus

1. lateral third - cartilaginous

2. medial two-thirds - canal in

temporal bone

3. oblique course

4. ceruminous glands - "earwax

5. sensory nerves

a) primarily auriculotemporal branch of


b) small portion by vagus (X)


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C. Tympanic Membrane

7. nerve supply

a) external - auriculotemporal (V3);

vagus (X) nerves

b) internal - glossopharyngeal (IX) nerve

External view

Internal view


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II. Middle Ear

A. Tympanic Cavity

1. relations

External acoustic meatus

Auditory tube

Tympanic membrane

Tensor tympani muscle

Tympanic cavity


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II. Middle Ear

A. Tympanic Cavity

1. relations - lateral wall

Tympanic membrane

Chorda tympani

Tensor tympani muscle

Malleus Incus

Facial nerve (VII)

Auditory tube


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II. Middle Ear

A. Tympanic Cavity

1. relations - medial wallLateral semicircular canal

Facial nerve canal

Oval window

Round window

Promontory

Tympanic nerve (IX)

Stapes

Stapedius muscle

Facial nerve (VII)


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II. Middle Ear

B. Auditory Tube

1. connects middle

ear to nasopharynx

2. cartilaginous in

nasopharynx

3. bony in middle

ear


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II. Middle Ear

C. Auditory Ossicles

1. malleus

2. incus

3. stapes

1

2

3

12

3


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II. Middle Ear

D. Auditory Muscles

1. tensor tympani muscle -

mandibular division of


2. stapedius muscle -

facial nerve (VII)


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II. Middle Ear

E. Nerves in Region

1. chorda tympani branch of facial nerve (VII)

2. glossopharyngeal nerve (IX)


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III. Inner Ear (Cochlea, Vestibular Apparatus)

A. Structure

Cochlea

Semicircular canals


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A. Structure

1. osseous (bony) labyrinth

Vestibule

Semicircular canals:

Cochlea

AnteriorLateral

Posterior

Oval window Round window


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A. Structure

2. membranous labyrinth endolymph filled

a) saccule

b) utricle

c) three semicircular

ducts with

ampullae

d) cochlear duct

e) endolymphatic

duct and sac

Sound

a

b

c

d

e


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B. Function

1. balance - vestibular portion

2. hearing - cochlear portion


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III. Inner Ear (Vestibulocochlear Nerve (VIII))

C. Vestibulocochlear Nerve (VIII)

1. strictly sensory for hearing and balance


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IV. Clinical Considerations

A. Conductive deafness


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IV. Clinical Considerations

B. Otitis media


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Headphone Use May Worsen Hearing Loss

Experts say the growing popularity of portable music players and otheritems that attach directly to the ears has contributed to the problem of

hearing loss in younger people. (AP Photo/Charles Rex Arbogast)

http://news.yahoo.com/s/ap/20050913/ap_on_he_me/early_hearing_loss

Anatomy Lecture - Ear Champney

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