march 2 rec - Ear: outpost of the brain. Sound is just...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Ear: outpost of the brain. Sound is just variations of air compression across an area. Tympanic membrane moves in response to pressure changes. It is attached to the ossicles, and as the TM moves, the ossicles move and transfer the air pressure into a mechanical energy to the oval window. The inner ear, the choclea, has fluid. These vibrations transfers to movement of the fluid which stimulates basilar membrane, stretch hair cells, chemical stuff…then spiral ganglion sensory neurons to generate action potentials. Problems : fluid doesn’t move as easily as air does. Ossicles amplify the movements from the tympanic membrane by making smaller but more intense movements. Then you concentrate it by the time it hits the oval window (surface area at beginning of ossicles larger than at the end next to the oval window) Choclea is a hard bony structure. It is coiled, hard and strong. Basilar membrane is inside choclea, it has auditory receptors. It is narrower at the base than at the apex. It is stiffer and less flexible at the base than at the apex. It moves up and down. It is surrounded by fluid. Lower frequency maximizes deformity at apex, high frequency deforms it closer to the base. Turning mech. energy into potential energy: Organ of corti - hair cells- auditory receptors, rods of corti, and support cells. Bottom of hair cells are in the basilar membrane. Top of hair cells have steriocila
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/28/2009 for the course COG 050.203.01 taught by Professor Dr.rapp during the Spring '09 term at Johns Hopkins.

Page1 / 3

march 2 rec - Ear: outpost of the brain. Sound is just...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online