Ear

Question 1

External Ear

Answer 1

1) Auricle: skin
2) external auditory meatus
3) Tympanic membrane

Question 2

Middle Ear

Answer 2

1) tympanic cavity
2) bony labrynth

Question 3

Inner Ear

Answer 3

1) semicircular canals
2) vestibule
3) cochlea

Question 4

Tympanic membrane

Answer 4

Layers: skin of external acoustic meatus -> membrane: radially and circularly arranged collagen fibers -> mucous membrane of the middle ear
Simp squam -> CT -> simp cub

Question 5

Bones

Answer 5

Stapes, incus, malleus

Question 6

Internal ear

Answer 6

1) semicircular canals with crista ampularis - angular movement
2) vestibule: saccule, utricle
3) cochlea: vestibular apparatus and organ of corti

Question 7

Macula

Answer 7

• found in saccule and utricle
• senses linear acceleration and head positioning
• hair cells covered by endolymph fluid with otoconia
• otoconia: crystalline bodies

Question 8

Cristae ampularis

Answer 8

• of semicircular ducts
• epithelial ridge: perp to long axis of each canal
• epithelial hair cells: rotation
• support cells

Question 9

Cochlear Canal

Answer 9

• scala vestibuli and tympani: filled with perilymph which transmits sound waves
• Scala media: triangular, formed from:
  1) bony extension - osseus spiral lamina
  2) vestibular membrane
  3) stria vascularus: secretes endolymph fluid

Question 10

Organ of corti

Answer 10

• tectorial membrane: collagen fibers embedded in gelatinous ground substance
• hair cells
• supporting cells