Development of the Ear

Question 1

What does the auditory tube and tympanic cavity develop from?

Answer 1

• the first pharyngeal pouch

Question 2

The ectoderm of the first pharyngeal ______ and the endoderm of the first pharyngeal _______ forms the tympanic membrane

Answer 2

• cleft

- pouch

Question 3

What does the malleus and incus develop from?

Answer 3

• the first pharyngeal arch

Question 4

What does the stapes develop from?

Answer 4

• the second pharyngeal arch

Question 5

What pharyngeal arch is the auricle of the external ear derived from?

Answer 5

• 1 and 2

Question 6

What pharyngeal cleft is the external acoustic meatus of the external ear derived from?

Answer 6

• 1

Question 7

The otic placode of the inner ear is a thickening for the surface ectoderm at the _______

Answer 7

• rhombencephalon

Question 8

The membranous labryinth develops from ________

Answer 8

• surface ectoderm

Question 9

The bony labyrinth develops from __________

Answer 9

• mesoderm

Question 10

The face develops around the _______

Answer 10

• stomodeum

Question 11

The nasal placode is a _______ thickening that forms the nasal pit

Answer 11

• ectodermal