Inner ear anatomy

Question 1

What are the part of The bony labyrinth (also osseous labyrinth or otic capsule)?

Answer 1

the vestibule, semicircular canals, and cochlea

Question 2

What are the contents of Vestiule?

Answer 2

the saccule and the utricle

Question 3

What are the three semicircular canals?

Answer 3

anterior, posterior, and lateral

Question 4

What the semicircular canals contains?

Answer 4

endolymphatic fluid

Question 5

What are the three components of osseous cochlea?

Answer 5

• Bony spiral Canal
• Modiolus
• Osseous Lamina

Question 6

What is the Modiolus?

Answer 6

A central bony core within the cochlea

Question 7

What an Osseous Lamina?

Answer 7

Thin bony plates- divide the cochlear canal into : scala vestibuli, scala media (cochlear duct), and scala tympani

Question 8

What are the Boundries of the scala media?

Answer 8

the basilar membrane below and the vestibular membrane (Reissner’s membrane) above.

Question 9

Where the organ of corti is found?

Answer 9

• cochlear duct (scala media)

Question 10

What is the structure if the organ of corti?

Answer 10

• Organized along the basilar membrane, containing rows of sensory hair cells and supporting cells

Question 11

What are the two types of Sensory hair cells?

Answer 11

• Three rows of outer hair cells and one row of inner hair cells

Question 12

What is the function of outer cells?

Answer 12

• Amplify and fine-tune sound vibrations, enhancing sensitivity and frequency selectivity

Question 13

What is the function of Inner cells?

Answer 13

• Primary receptors for sound, responsible for converting vibrations into electrical signals

Question 14

What is the function of utricle and saccule?

Answer 14

• organs of balance which detect movement or acceleration of the head in the vertical( saccule) and horizontal planes ( utricle)

Question 15

What is the content of saccule and utricle?

Answer 15

• Endolymph