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Title: study guide in anatomy of the ears
Description: brief study guide in anatomy of the ears
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ANATOMY of the EARS
RYAN M ARTIN KO, M D

EXTERNAL EAR







Auricle or pinna
elastic cartilage covered
by skin
attached to head by
muscles and ligaments
incomplete at incisura
terminalis

EXTERNAL EAR
 External auditory canal

 length: 24 mm in adults
 Outer 1/3 cartilage:

inner 2/3 bony
- fissures of Santorini
- foramen of Huschke

EXTERNAL EAR



External auditory
canal

 Skin

- tightly bound to
underlying cartilage
- adnexal tissues
* hair
* ceruminous
glands

EXTERNAL EAR
 Lymphatics:






tragus & anterior parotid nodes
posterior retroauricular nodes
lobule superior cervical nodes

EXTERNAL EAR
 Nerve supply:










V3 via auriculotemporal branch
VII via posterior auricular nerve
IX (Jacobson’s nerve)
X (Alderman’s or Arnold’s)
C2, C3 nerves (greater auricular
nerve and lesser occipital nerve)

EXTERNAL EAR
 Tympanic membrane
 normal appearance

- semi-translucent, oval,
cone-shaped presenting
obliquely w/ cone of light
 size: 1
...
wall of
EAC
 Inferior  Digastric ridge

MIDDLE EAR
 Ossicles

2
...
malleus (hammer)

3
...
Bony labyrinth

1
...
semicircular canals
3
...
Membranous labyrinth
1
...
Utricle & Saccule
- macula: w/ Otoliths
(composed of Calcium
Carbonate)

INNER EAR
B
...
endolymphatic sac
4
Title: study guide in anatomy of the ears
Description: brief study guide in anatomy of the ears
Buy These NotesPreview