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Flashcards in Ear Deck (27):
1

External Ear

Helix and Anti Helix
Tragus and Anti Tragus

2

External Acoustic Meatus

Concha of auricle to tympanic membrane
Lateral 1/3 cartilaginous, S shaped
Medial 2/3 is bone
Ceruminous and sebaceous glands produce cerumen

3

Innervation of External Acoustic Meatus

Auriculotemporal
CN 7 and 10

4

Tympanic Membrane

Umbo-central depression
Cone of light radiates anteroinferiorly

5

Tympanic Membrane Innervation

External surface = Auriculotemporal (V3)
Internal surface = Glosso (CN 9)

6

Middle Ear

Anteriorly connected to nasopharynx by pharyngotympanic tube
Posterosuperiorly connected to mastoid air cells

7

Middle Ear Contents

Stapedius
Tensor Tympani
Ossicles
Chorda Tympani
Tympanic Plexus

8

Ossicles

Malleus
Incus
Stapes

9

Malleus

Mallet or Hammer
Head, neck, handle
Tensor Tympani (V3) inserts on handle to reduce amplitude of oscillations
Chorda Tympani cross on medial surface of neck

10

Incus

Anvil
Lies within the epitympanic recess

11

Stapes

Stirrup
Sits on oval window of inner ear

12

Roof of Middle Ear (Tympanic Cavity)

Tegmen tympani portion of temporal bone

13

Floor of Middle Ear (Tympanc Cavity)

Separates tympanic cavity from jugular foramen and IJV

14

Lateral wall of Middle Ear

Tympanic Membrane
Malleus
Chorda Tympani

15

Medial Wall of Middle Ear

Separates tympanic cavity from inner ear
Promonotory
Oval window with stapes
Round window

16

Anterior Wall of Middle Ear

Separates tympanic cavity from carotid canal and internal carotid artery
Auditory tube and canal for tensor tympani

17

Posterior Wall of Middle Ear

Air cells within mastoid antrum
Facial canal
Pyramidal eminence for stapedius (CN 7)

18

Pharyngotympanic Tube

Auditory or Eustachian Tube
Connects middle ear to nasopharynx
Posterolateral 1/3 is bony, rest is cartilaginous
Equalizes pressure in middle ear

19

Internal Ear - Bony Labyrinth

Cochlea
Vestibule
Semicircular Canals

20

Internal Ear - Membranous Labyrinth

Cochlear Duct
Saccule and Utricle
Semicircular Ducts
Endolymphatic Duct and Sac

21

Internal Ear - Cochlea

Produces promonotory on medial wall of middle ear cavity, basal turn
Cochlear duct is suspended by fluid inside

22

Internal Ear - Vestibule

Saccule and Utricle are suspended within it
Endolymphatic duct to endolymphatic sac

23

Internal Ear - Semicircular Canals

Anterior, Posterior, Lateral
- Set at right angles to each other, 3 planes of space
Communicate with vestibule
Semicircular ducts are suspended with them

24

Internal Ear - Internal Acoustic Meatus

Entrance of CNs 7 and 8 from posterior cranial fossa into inner ear

25

Otitis Media

Myringotomy

26

Meniere Syndrome

Increase endolymphatic fluid volume
Tinnitus, hearing loss, veritgo

27

Hyperacusis

Loss of CN 7