Name the 3 parts of the Ear and its 3 functions?
1. OUTER EAR
2. MIDDLE EAR
3. INNER EAR
The OUTER EAR consists of 2 parts. What are they?
1. The PINNA
2. EXTERNAL AUDITORY CANAL
What is the PINNA made up of and what is its function?
The pinna is the cartilage of the ear; it acts as a funnel to capture the sound.
Transmission of sound vibrations through the OUTER EAR occurs through what substance?
What is the middle ear normally filled with?
The middle ear is open to the nasopharynx by way of what structure and what is its function?
The function of the auditory tube is to equalize the pressure of the middle ear and the outside air, so the ear bones can vibrate.
What 3 bones are attached to the tympanic membrane and what is their function?
1. MALLEUS (hammer). The malleus vibrates the incus
2. INCUS (anvil). Vibrates the stapes
3. STAPES (stirrup). Their function is to amplify sound vibrations.
The INNER EAR is in what portion of the skull?
The temporal bone (petrious portion).
Bony Labyrinth is filled with what fluid?
Bony Labyrinth is filled with PERILYMPH
What fluid is in the MEMBRANOUS LABYRINTH?
What structure contains receptors for hearing?
What 3 structures are responsible for balance?
1. Semicircular Canals
F. Vestibulocochle ar nerve
Where are hair cells found?
Hair cells are receptor cells for what 2 things?
Cochlea and Semicircular Canals
Hearing and equilibrium
What cranial nerve carries information for hearing?
CN VIII VESTIBULAR COCHLEAR NERVE
What is the stapes is attached to?
What structure determines movement in three planes?
What are the two joined structures attached to the semi-circular canals?
UTRICLE and the SACCULE.
What type of fluid and what receptors are within each semi-circular canal?
Endolymph and hair cells.
What are calcium deposits in the inner ear called?
They are an essential part of the utricle and saccule for what purpose?
OTOLITHS (ear rocks)
How is the Otoliths play an essential process in stimulating the hair cells?
It allows the hair cells in this region to act as receptors by telling you what position your head is in and provide you a sense of equilibrium.
What is VERTIGO or LABYRINTHITIS?
Inflammation of the semi-circular canals that give a sense of motion when you're not moving. This can be debilitating.
anatomy, unit 2, lecture 11, ear