Ear

Question 1

External Ear

Answer 1

Helix and Anti Helix

Tragus and Anti Tragus

Question 2

External Acoustic Meatus

Answer 2

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

Question 3

Innervation of External Acoustic Meatus

Answer 3

Auriculotemporal

CN 7 and 10

Question 4

Tympanic Membrane

Answer 4

Umbo-central depression

Cone of light radiates anteroinferiorly

Question 5

Tympanic Membrane Innervation

Answer 5

External surface = Auriculotemporal (V3)

Internal surface = Glosso (CN 9)

Question 6

Middle Ear

Answer 6

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

Question 7

Middle Ear Contents

Answer 7

Stapedius
Tensor Tympani
Ossicles
Chorda Tympani
Tympanic Plexus

Question 8

Ossicles

Answer 8

Malleus
Incus
Stapes

Question 9

Malleus

Answer 9

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

Question 10

Incus

Answer 10

Anvil

Lies within the epitympanic recess

Question 11

Stapes

Answer 11

Stirrup

Sits on oval window of inner ear

Question 12

Roof of Middle Ear (Tympanic Cavity)

Answer 12

Tegmen tympani portion of temporal bone

Question 13

Floor of Middle Ear (Tympanc Cavity)

Answer 13

Separates tympanic cavity from jugular foramen and IJV

Question 14

Lateral wall of Middle Ear

Answer 14

Tympanic Membrane
Malleus
Chorda Tympani

Question 15

Medial Wall of Middle Ear

Answer 15

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

Question 16

Anterior Wall of Middle Ear

Answer 16

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

Question 17

Posterior Wall of Middle Ear

Answer 17

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

Question 18

Pharyngotympanic Tube

Answer 18

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

Question 19

Internal Ear - Bony Labyrinth

Answer 19

Cochlea
Vestibule
Semicircular Canals

Question 20

Internal Ear - Membranous Labyrinth

Answer 20

Cochlear Duct
Saccule and Utricle
Semicircular Ducts
Endolymphatic Duct and Sac

Question 21

Internal Ear - Cochlea

Answer 21

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

Question 22

Internal Ear - Vestibule

Answer 22

Saccule and Utricle are suspended within it

Endolymphatic duct to endolymphatic sac

Question 23

Internal Ear - Semicircular Canals

Answer 23

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

Question 24

Internal Ear - Internal Acoustic Meatus

Answer 24

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

Question 25

Otitis Media

Answer 25

Myringotomy

Question 26

Meniere Syndrome

Answer 26

Increase endolymphatic fluid volume

Tinnitus, hearing loss, veritgo

Question 27

Hyperacusis

Answer 27

Loss of CN 7