Ear Development: Inner Ear

Question 1

Inner ear development

Answer 1

1. Develops from Otic placode which is ectodermal thickening on surface ectoderm
2. Placode is depressed then becomes converted into Otic vesicle (otocyst) which sinks underlying mesoderm and gives rise to membranous labyrinth which consists of 2 parts:
   - vestibular part
   - cochlear par

Question 2

Vestibular part

Answer 2

1. Semicircular ducts
2. Utricle

Question 3

Cochlear part

Answer 3

1. Cochlear duct
2. Saccule

Question 4

Membranous labyrinth development

Answer 4

Becomes surrounded by bony labyrinth which is developed from surrounding mesoderm