Ear Flashcards
1
Q
Ear general
A
Ear
Function
- collect auditory stim
- transduce mechanical stim
- transmit nerve impulse to CNS
Structure
- Outer
- Middle
- Inner
2
Q
Outer Ear
A
Outer Ear
- Auricle or Pinna (elastic cartilage)
- External ear canal
- Tympanic membrane (eardrum)
- malleus
- pars flaccida
- pars tensa
3
Q
Ceruminous glands
A
= glands of the outer ear
- Simple, coild, tubular
- ear wax= mixture of viscous and sebaceous glands
4
Q
Middle Ear
A
Middle Ear
- Tympanic cavity- airfilled
- Auditory ossicles- vibration of sound at tumpanic membrane transmitted through middle ear to cochlia via ossicles
- malleus bone
- tensor tympani m.
- incus bone
- stapes bone
- stapedius m. (protects ear from loud sounds)
- malleus bone
- Auditory tube
- connection between ear and mouth for equilizing
***tympanic bulla is part of skull encases inner ear
5
Q
Inner Ear
A
Inner Ear
- bony labyrinth- contains perilymph
- vestibule (contains utricle and saccule)
- semicircular canals
- cochlea
- membranous labrynth
- cochlear duct
- utricle, saccule
- 3 semicircular ducts
6
Q
Cochlea
A
Inner ear- cochlea
- scala vestibuli- contains perilymph
- cochlear duct- contains endolymph
- organ of corti (spiral organ)
- steriocilia
- phalangeal support
- pillar cells
- organ of corti (spiral organ)
- scala tympani- contains perilymph
7
Q
Identify
A
8
Q
Identify
A
9
Q
Pathway of sound
A
Pathway of sound
Outer ear
- tympanic membrane
- malleus, incus, stabes
- vestibular window
- scala vestibuli
- helicotrema
- scala tympani
- deflects cochlear duct and stimulates orgna of Corti
10
Q
Vestibular Apparatus
A
inner ear
Vestibular Apparatus = organs of equilibrium and motion detection
- utricle
- contains macula utriculi
- saccule
- contains macula sacculi
- semicircular ducts
- contain crista ampullaris: detect angular acceleration and deceleration
within these structures are neuroepithelial cells
11
Q
Utricle and Saccule
A
inner ear: vestibular apparatus
Utricle and Saccule
- contain neuroepithelial cells
- movement of neuroepithelial cells displaces otoliths
- otolith movement transmitted to macula of utricle/saccule
- causes bending of the steriocillia (hair cells)
12
Q
Semicircular ducts
A
inner ear- vestibular apparatus
Semicircular ducts
- 3 ducts detect angular acceleration in any direction
- ducts contain the crista ampullaris which has sensory epithelim composed of sensory hair cells.
- hair cells project into a cupula which is a gel mass that moves and impulese sent to brain
13
Q
Cochlear duct details
A
inner ear- Cochlea
Cochlear Duct
- Tectorial membrane- vibrated by sound wave energy
- Organ of corti
- hair cells
- phalangeal cells- support
- pillar cells- move hair cells
- Basilar membrane- vibrated by sound wave energy
- Stria vascularis- produces endolymph
14
Q
Identify
A
15
Q
Dynamic Equilibrium
A
