Middle Ear Anatomy: Medial Wall, Muscles, And Auricle Innervation

Middle Ear Anatomy: Medial Wall, Muscles, And Auricle Innervation

Question 1. Briefly describe the features of the medial wall of middle ear.
Answer:

Medial wall of middle ear has following features:

1. Promontory

• It is rounded bulging produced by first turn of the cochlea
• Grooved by tympanic plexus

2. Fenestra vestibule

• It is oval opening posteriosuperior to the promontory
• It leads into the vestibule of the internal ear

3. Prominence of the facial canal

• It reaches the lower margin of aditus
• Ends at stylomastoid foramen

4. Fenestra cochlea

• It is round opening posteroinferior to the promontory
• It opens into the Scala tympani of the cochlea

5. Sinus tympani

• It is a depression behind the promontory

6. Processus cochleariformis

• It is curved lamina between the canals for the tensor tympani and for the auditory tube.

7. Prominence of lateral semicircular canal

• Present above the facial canal

Question 2. Nerve supply to the auricle (pinna)
Answer: