Head: Ear

Question 1

Ear is involved with

Answer 1

• Hearing

- Equilibrium

Question 2

3 parts of the ear

Answer 2

• External ear
• Middle ear
• Internal ear

Question 3

Internal ear contains

Answer 3

• Receptors for hearing and balance

Question 4

External ear contains

Answer 4

• Auricle
• External acoustic meatus
• Tympanic membrane

Question 5

Auricle

Answer 5

• Visible portion of ear

- Elastic cartilage

Question 6

External acoustic meatus

Answer 6

• Ear canal, from auricle to tympanic membrane
• 2.5 cm in length
• S-shaped

Question 7

Tympanic membrane

Answer 7

• Separates external from middle ear
• Moves in response to sound waves
• Vibrations transferred to auditory ossicle

Question 8

Middle ear contains

Answer 8

• Auditory ossicles (malleus, incus, stapes)
• Stapedius and tensor tympani muscles
• Chorda tympani nerve (branch of facial nerve)
• Tympanic plexus

Question 9

Tympanic cavity is found within

Answer 9

• The petrous part of temporal bone

Question 10

Tympanic cavity communicates with

Answer 10

• Nasopharynx via pharyngotympanic tube (equalizes pressure)

- Mastoid air cells via mastoid antrum

Question 11

External ear innervation

Answer 11

• Great auricular (C2,3)
• Lesser occipital
• Auriculotemporal (branch of V3)
• Vagus and facial cranial nerves

Question 12

External acoustic meatus and external tympanic membrane innervations

Answer 12

• Auriculotemporal (V3)
• Facial nerve
• Vagus nerve

Question 13

Middle ear and internal part of tympanic membrane innervation

Answer 13

• Glossopharyngeal nerve (tympanic plexus)

Question 14

External ear and external acoustic meatus arterial supply

Answer 14

• Posterior auricular
• Superficial temporal
• Deep auricular

Question 15

Middle ear arterial supply

Answer 15

• Anterior tympanic,
• Posterior auricular
• Middle meningeal