Hearing in the middle and inner ear

This muscle keeps pulls the malleus inward and as a result keeps the tympanic membrane tensed. This allows sound vibrations on any part of the tympanic membrane to be transmitted to the malleus.

• Sartorius

• Gastrocnemius

• tensor tympani

• Stapedius Muscle

I am the result of a 17 fold difference in area between the tympanic membrane and stapes. The ossicles then impart about 22x's as much force to the cochlear fluid vs. the vibration of the tympanic membrane. It helps because fluid has greater inertia than air does. What am I?

• Pressure regression

• Sound matching

• gating

• Impedance matching

This muscle pulls the Stapes outward when sounds are too intense for your inner ear to handle.

• Soleus

• Stapedius

• Tensor Tympani

• Sternocleidomastoid

What inner ear structure lies on top of the basilar membrane? It contains the hair cells.

• The Organ of Corti

• The Scala media

• Scala vestibuli

• Vestibular membrane (Reissner's membrane)

There are three ducts found in the Cochlea. Name them.

• Vestibular

• Cochlear

• Spiral

• Tympanic

Which best describes the Tectorial membrane?

• It separates the Scala media and the Scala vestibuli

• It vibrates greatly when different sounds enter the cochlea

• It is a gelatinous layer that anchors the hair outer hair cell stereocilia

• It is the membrane the Organ of Corti sits upon.

What is true regarding frequency detection in the Cochlea?

• The entire basilar membrane vibrates regardless of the frequency of the sound.

• The high frequencies are detected just inside the oval window.

• The low frequencies are detected just inside the oval window

• The low frequency sounds are detected near the tip of the cochlea (the helicotrema)

The Scala tympani terminates in the __________.

• Round window

• Oval window

• Cochlear duct

• armpit

The oval window is located at the start of the __________ and ends at the ______, also known as the apex of the cochlea.

• Scala tympani; helicotreme

• Tectorial membrane; Round window

• Scala vestibuli; Organ of Corti

• Scala vestibuli; helicotrema

When the basilar membrane vibrates certain hair cells are excited. During excitation of the hair cells, channels on the stereocilia open and _________ ions flow in causing depolarization of the nerve at the base of the cell.

• K+

• H+

• Na+

• Cl-