Term
| PINNA/AURICLE (OUTER EAR 1ST) |
|
Definition
| sound waves enter the ear through the PINNA, or AURICLE first. this is the projecting part or flap of the ear. |
|
|
Term
| EXTERNAL AUDITORY MEATUS (OUTER EAR 2ND) |
|
Definition
| EXTERNAL AUDITORY MEATUS (AUDITORY CANAL)is second. leads from the pinna and is lined with numerous glands which secrete yellowish brown, waxy cerumen. |
|
|
Term
| TYMPANIC MEMBRANE/EARDRUM (MIDDLE EAR 3RD) |
|
Definition
| sound waves travel through auditory canal and strike a membrane between the outer and middle ear called TYMPANIC MEMBRANE/EARDRUM |
|
|
Term
|
Definition
| As the eardrum vibrates/ossicles, the hammer shaped bone called MALLEUS. This the first bone of the eardrum. |
|
|
Term
|
Definition
This is the second bone within the eardrum,
which in turns vibrates/ossicles, the INCUS bone. |
|
|
Term
|
Definition
| The 3rd and final small bone of the eardrum called the STAPES also ossicles (shaped like a stirrup) |
|
|
Term
OVAL WINDOW
(MIDDLE EAR 7TH) |
|
Definition
| The OVAL WINDOW is a membrane which separates the middle from the inner ear. |
|
|
Term
AUDITORY/EUSTACHIAN TUBE
(MIDDLE EAR 8TH) |
|
Definition
| Is a canal leading from the middle ear to the pharynx. Normally closed but opens when swallowing. Protects eardrum. Prevents shock to middle and inner ear. |
|
|
Term
|
Definition
| Snail-shaped structure called the COCHLEA. Contains auditory liquids called perilymph and endolymph which vibrations travel. Organ of Corti is a receptor in this area. |
|
|
Term
AUDITORY NERVE FIBERS
(INNER EAR 10TH) |
|
Definition
| Tiny hair cells receive vibrations from auditory liquids and relay the sound waves to AUDITORY NERVE FIBERS, which end in the auditory center of the cerebral cortex. |
|
|
Term
VESTIBULE
(INNER EAR 11TH) |
|
Definition
| VESTIBULE connects the cochlea (for hearing) |
|
|
Term
SEMICIRCULAR CANALS
(INNER EAR 12TH) |
|
Definition
| the SEMICIRCULAR CANALS is where balance takes place, two membrane sacs called saccule and utricle contain a fluid, endolymph, sensitive hair fluctuate in response to movement of the head. Impulses then sent from the brain to muscles throughout the body to ensure balance. |
|
|
