What are the 3 parts that makes up the ear
External ear
Middle ear
Inner ear
External ear consist of
Pinna
The external auditory canal
Pinner
Description
Function
Cartilage covered in skin on either side of the head
FUNCTION
It direct sound waves into the external auditory canal
External auditory canal
Description
Function
Curved tube that approximately 25 mm long
FUNCTION
transmits sound waves from pinna to tympanic membrane
The middle ear consists of
Typmpanic membrane Ossicles Ovul window Round window Opening of Eustachian tube
The middle ear consists of
Typmpanic membrane Ossicles Ovul window Round window Opening of Eustachian tube
Tympanic membrane
Description
Function
It’s a thin membrane that covers the opening between the external auditory canal and the middle ear
FUNCTION
concert sound waves into vibrations that are transmitted to the malleus the first ear ossical
What are the 3 ossicals
Malleus
Incus
Stapes
Ossicals
Description
Function
Malleus, incus and stapes
•The ossicles are joined together by tiny ligaments that articulat with each other
•one end of the malleus attaches to the tympanic membrane and the other to the incus which articulate with the stapes
•stapes attaches to the ovul window
•form a lever that connects the outter ear with the inner ear
FUNCTION
Amplifies and transmits vibrations to the ovul window
Ovul window
Description
Function
•Opening is covered by a thin membrane that connects the middle ear with the inner ear
•the area of the ovul window is smaller thn that of the tympanic membrane
FUNCTION
transmit vibrations from the air filled middle ear to the fluid filled inner ear
Round window
Description
Function
The opening between the middle ear and inner ear that is situated below the ovul window
Covered by a thin membrane
FUNCTION
absorb pressure waves from the perilymph
Eustachian Tube
Description
Function
Connects he middle ear to the pharynx
FUNCTION
to equalizer pressur on both sides of the tympanic membrane
Inner ear divided into your
Vestibular apparatus
Cochlea
Which one is which for hearing and balance
Vestibular apparatus is for balance
Cochlea is for hearing
Bony labyrinth
Series of canal and cavity in the temporal labyrinth filled with perilymph fluid
Membraneous labyrinth
Membraneous tube and sac filled with endolymph that floats in the perilymph of bony labyrinth
Role of semi circular canal in maintaining balance
- A change in speed or direction of movement
- Stimulats the cristae
- Stimuli is converted into an impulse
- Impulse is transmitted to the cerebellum via the auditory nerve
- Cerebellum send impulse to the muscles to restore balance
How increas of production in mucus can cause the tympanic membrane to burst
- Mucus blocks opening of Eustachian tube
- causing pressure in middle ear
- pushing on the tympanic membrane
What willhappen if ossicles do not function
- The ossicles will not be able to vibrate
- therefore vibrations will not be passed to the inner ear
- Cochlea will not be stimulated so no amplification
What will lead to hearing loss in an older person
- The ovul window will not vibrate freely
- therefore the cochlea will not recieve any vibrations
- no pressure waves will form in cochlea
- therefore the organ of corti will not be stimulated
- fewer or no impulse sent to the cerebrum
Maculae
Function
Reacts to gravity by detecting position of your head
Cristae
Function
Detects the speed and movement of head
