Formation of the Ear ( Finals )

Question 1

The ear has three components:

Question 2

What component of the ear contains sense organs for hearing (cochlea) and detecting head acceleration (vestibular apparatus), the latter is important in balance?

Answer 2

inner ear

Question 3

What component of the ear contains bones (ossicles) that convey vibrations from the tympanic membrane (ear drum)
to the inner ear.

Answer 3

middle ear

Question 4

What component of the ear channels sound waves to the tympanic membrane.

Answer 4

outer ear

Question 5

develops in surface ectoderm adjacent to the hindbrain; it invaginates to form a cup which then closes and separates from the ectoderm, forming an otic vesicle

Answer 5

otic placode

Question 6

composed of cartilage, surrounds the otocyst;

Answer 6

otic capsule

Question 7

undergoes differential growth to form the cochlear duct and semicircular ducts of the membranous labyrinth

Answer 7

otic vesicle

Question 8

undergoes similar differential growth to form the osseous labyrinth within the future petrous part of the temporal bone

Answer 8

cartilagenous otic capsule

Question 9

the dorsal part of the first pharyngeal pouch forms the lining of the?

Answer 9

auditory tube and tympanic cavity

Question 10

These two develop as endochondral bones from ectomesenchyme in the first pharyngeal arch

Answer 10

malleus and incus

Question 11

malleus and incus develop as endochondral bones from ectomesenchyme in the first pharyngeal arch and the ? develops similarly from the second arch

Answer 11

stapes

Question 12

is formed by apposition of endoderm and ectoderm where the first pharyngeal pouch is apposed to the groove between the first and second pharyngeal (pharyngeal) arches;

Answer 12

tympanic membrane

Question 13

What is formed by the groove between the first and second pharyngeal arches

Answer 13

external ear canal (meatus)