BMS 107 Equilibrium and Hearing Flashcards
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What are the three anatomical divisions of the ear? What are their functions?
- External ear - hearing
- Middle ear - hearing
- Internal ear - hearing and equilibrium
The ear contains organ of ___________ and __________.
equilibrium; hearing
What is the skin (integument) covered, funnel-shaped, elastic cartilage supported structure called?
Auricle
The auricle leads to a bony tube called the _______________.
external acoustic meatus
The external acoustic meatus ends at a structure called the ____________.
tympanic membrane (eardrum)
What is the tympanic membrane?
An epithelial sheet that vibrates
What is the waxy substance that the acoustic meatus secretes into the auricle?
cerumen (earwax)
What is the middle ear?
An air filled cavity just medial to the tympanic membrane.
What are the two general structures contained in the middle ear?
- auditory tube (eustachian tube)
2. auditory ossicles (malleus, incus, stapes)
What are the 3 smallest bones in the body?
- malleus
- incus
- stapes
What are the two smallest muscles in the body?
- tensor tympani muscle
2. stapedius muscle
List the three bones of the middle ear and their functions?
- Malleus (hammer) - attached to the tympanic membrane and articulates with the incus
- Incus (anvil) - middle of the three bones and, in turn, articulates with the stapes
- Stapes (stirrup) - the foot plate of the “stirrup” fits into the oval window on the lateral wall of the inner ear
Where is the inner ear located?
within the petrous part of the temporal bone
What are the fluid-filled spaces in the inner ear called?
bony labyrinth
Within the bony labyrinth are fluid-filled tubes and spaces are called _______.
membranous labyrinth