special sense: hearing and equilibrium Flashcards Preview

a&p lab > special sense: hearing and equilibrium > Flashcards

Flashcards in special sense: hearing and equilibrium Deck (23):
1

• External Ear

o Composed of the auricle and external acoustic meatus

2

• Auricle (pinna)

o The skin covered cartilaginous structure encircling the auditory canal opening

3

• Lobule

portion of the pinna lying inferior to the external auditory canal

4

• External Acoustic Meatus (external auditory canal)

short narrow chamber carved into the temporal bone

5

• Ceruminous Glands

o Skin lined walls in the external acoustic meatus that secrete wax

6

• Tympanic Membrane( Eardrum)

o Where sound wave enter that vibrate at exactly the same frequency as the sound waves hitting it

7

• Middle Ear

o A small chamber, tympanic cavity, found within the temporal bine

8

• Auditory ossicles

o Malleus, incus, stapes
o Articulate to form a lever system that amplifies and transmits the vibratory motion of the eardrum to the fluids of the inner ear via the oval window

9

• Pharyngotympanic (auditory) tube

o Connects the middle ear chamber with the nasopharynx

10

• Otitis Media

o Inflammation of the middle ear

11

• Internal Ear

o A system of bony and rather tortuous chambers called the bony labyrinth

12

• Bony Labyrinth

o Filled with perilymph
o Cochlea, vestibule, semicircular canals

13

• Perilymph

o Aqueous fluid in the bony labyrinth

14

• Vestibule

o Involved with equilibrium

15

• Semicircular Canal

o Involved with equilibrium

16

• Cochlea

o Contains sensory receptors for hearing

17

• Cochlear duct

o Soft, wormlike tube about 3.8 cm long
o Separates the perilymph containing cochlea cavities into upper and lower chambers

18

• (Middle) Scala media

o Cochlear duct
o Filled with endolymph
o Supports the spinal organ

19

• Spinal Organ

o Contains the receptors for hearing
o Sensory hair cells and nerve endings of the cochlear nerve(vestibulocochlear nerve(VIII))

20

• Basilar Membrane

o Forms the floor of the cochlear duct

21

• Tectorial membrane

o Gelatinous membrane that stereocilia hairs project into

22

• Hair cells

o Receptors that monitor head position and acceleration in a straight line

23

• Otolith

o small grains of calcium carbonate