8/3/2019 Anatomy Lecture - Ear Champney
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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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I. External Features
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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I. External Features
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
trigeminal nerve (V3)
b) small portion by vagus (X)
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I. External Features
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
trigeminal nerve (V3)
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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III. Inner Ear (Cochlea, Vestibular Apparatus)
A. Structure
1. osseous (bony) labyrinth
Vestibule
Semicircular canals:
Cochlea
AnteriorLateral
Posterior
Oval window Round window
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III. Inner Ear (Cochlea, Vestibular Apparatus)
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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III. Inner Ear (Cochlea, Vestibular Apparatus)
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