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What are auditory ossicles?
Three small bnes that are prominent structures within the middle ear.
These articulate together to permit vibratory motion.
How does vibration travel in the auditory ossicles?
Malleus first picks up vibration and arituclates with the central ossicle known as the Incus which conencts to the stapes.
The stapes is attached to the oval window which leads into the inner ear.
What's a good way to remember the 3 auditory ossicles?
- Malleus - mallet or hammer.
- Incus - anvil
- Stapes - stirrup-shaped foot plate
What does the internal ear contain?
Containts esesnetial sensory apparatus for both hearing asnd equilibrium located ath the denset portion of the petrous pyramids.
What is the division of the internal ear?
- Divided into two:
- Osseous/Bony Labrnth: Houses the membranous labrynth.
- Membranous labrynth:a serioies of intercommunicating ducts and sacs.
What duct do you find inside the membranous labrnyth?
Endolymphathic duct - a blind pouch or closed ucct cotnainedi n a small canal-like bony structure.
What is the divisions of the Bony Labrynth ( osseous ) ?
- Divided into three distinct shaped parts:
- Cochlea (snail shell) : most anterior of the three parts. Best shown in the aleral view of the osseous labrynth. Contains the "round window" or cochlear window in the base of it. Relates to the sense of hearing because of its connection to the stapes.
- Vestibule: central portion of the bony labrynth that cotnains the oval windows ( vestibular window )
- Semicircular canals. Has three parts nown as the superior, posterior and alteral semicircular canals located at the right angle to the otehr two allowign a sense of quilibrium as well as asense of direction.
What do you see in the axiolateral projection foe ar?
- A.. EAM
- B. Mastoid antrum
- C. Mastoid AIr Cells
- D. Downside mandibuilar ocndyle
- E. Upside Mandibiualr condyle (magnified )
What do you see in a posteiro profile position?
- A. Petrous ridges
- B. Bon labrynth
- C. EAM
- D. Region of itnernal acoustic canal
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