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Chapter 8 Quiz 3
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23
Anatomy
11th Grade
01/12/2012

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Term
AURICLE (PINNA)
Definition
 The visible part of the outer ear. It collects sound and directs it into the outer ear canal.
Term
EXTERNAL ACOUSTIC MEATUS
Definition
AUDITORY CANAL; A SHORT, NARROW CHAMBER (1 INCH LONG BY 1/4 INCH WIDE) CARVED INTO THE TEMPORAL BONE OF THE SKULL.
Term
CERUMINOUS GLANDS
Definition

GLANDS LOCATED IN THE 

SKIN-LIKE WALLS OF THE AUDITORY CANAL THAT SECRETE A  WAXY YELLOW SUBSTANCE (EARWAX).

Term
TYMPANIC MEMBRANE
Definition
EARDRUM; SOUND WAVES ENTER THE AUDITORY CANAL EVENTUALLY HIT THIS MEMBRANE AND CAUSE IT TO VIBRATE.
Term

 

 

TYMPANIC CAVITY

(MIDDLE EAR)

Definition
IS A SMALL, AIR-FILLED, MUCOSA-LINED CAVITY WITHIN THE TEMPORAL BONE.
Term

PHARYNGOTYMPANIC TUBE

(EUSTACHIAN TUBE)

Definition
A TUBE THAT CONNECTS THE MIDDLE EAR AND THE PHARYNX; ALLOWS PRESSURE TO BE EQUALIZED ON BOTH SIDES OF THE EAR DRUM.
Term
OTITIS MEDIA
Definition
INFLAMATION OF THE MIDDLE EAR; RESULTS FROM A SORE THROAT
Term

OVAL WINDOW

(VESTIBULR WINDOW)

Definition
IS A MEMBRANE-COVERED OPENING WHICH LEADS FROM THE MIDDLE EAR TO THE VESTIBULE OF THE INNER EAR.
Term
ROUND WINDOW
Definition
Serves as a pressure valve, bulging outward as fluid pressure rises in the inner ear.
Term
OSSICLES
Definition
THE THREE BONES OF THE MIDDLE EAR; ANVIL, HAMMER, STIRRUP
Term
BONES OF THE MIDDLE EAR
Definition

HAMMER OR MALLEUS

ANVIL OR INCUS

STIRRUP OR STAPES

 

 

THE HAMMER MOVES AND TRANSFERS VIBRATION TO THE ANVIL; THE STIRRUP PRESSES ON THE OVAL WINDOW; EVENTUALLY EXCITING HEARING RECEPTORS.

Term

 

OSSEOUS LABYRINTH

(INTERNAL EAR)

Definition
A MAZE OF BONY CHAMBERS CALLED THE OSSEOUS (BONY) LABYRYINTH LOCATED DEEP WITHIN THE TEMPORAL BONE BEHIND EYE SOCKET.
Term
COCHLEA
Definition
A CAVITY OF THE INNER EAR RESEMBLING A SNAIL SHELL; HOUSES THE HEARING RECEPTOR.
Term
VESTIBULE
Definition
SITUATED IN THE INTERNAL EAR BETWEEN THE SEMICIRCULAR CANALS AND THE COCHLEA
Term
PERILYMPH
Definition
PLASMA-LIKE FLUID THAT FILLS THE OSSEOUS LABYRINTH
Term
MEMBRANOUS LABYRINTH
Definition
(LOCATED IN THE PERILYMPH) A SYSTEM OF MEMBRANE SACS THAT FOLLOWS THAT SHAPE OF THE BONY LABYRINTH.
Term
ENDOLYMPH
Definition
THICK FLUID THAT IS LOCATED IN THE MEMBRANOUS LABYRINTH.
Term
OTITIS MEDIA
Definition
AN EAR INFECTION THAT IS MOST OFTEN A BACTERIAL OR VIRAL INFECTION THAT AFFECTS THE MIDDLE EAR, THE AIR-FILLED SPACE BEHIND THE EARDRUM THAT CONTAINS THE TINY VIBRATING BONES OF THE EAR. CHILDREN ARE MORE LIKELY THAN ADULTS TO GET EAR INFECTIONS. 
Term
MECHANORECEPTORS
Definition
RECEPTORS SENSITIVE TO MECHANICAL PRESSURES SUCH AS TOUCH, SOUND, OR CONTRACTIONS.
Term
ANVIL
Definition
(also called the incus) a tiny bone that passes vibrations from the hammer to the stirrup.
Term
HAMMER
Definition
(also called the malleus) a tiny bone that passes vibrations from the eardrum to the anvil.
Term
STIRRUP
Definition
also called the stapes) a tiny, U-shaped bone that passes vibrations from the stirrup to the cochlea. This is the smallest bone in the human body (it is 0.25 to 0.33 cm long).
Term
SEMICIRCULAR CANALS
Definition
three loops of fluid-filled tubes that are attached to the cochlea in the inner ear. They help us maintain our sense of balance.
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