The Ear Histology doesnt get better than this! Anatomy of the Ear Middle Ear The Inner Ear Osseous Labyrinth Bony Labyrinth Membranous Labyrinth The Inner Ear Membranous in Osseous Labyrinth Receptor Organs (red) in the Membranous Labyrinth General Structure of a Receptor Organ Hairs of a Hair Cell A Macula ~ 10 microns ~ 1 centimeter Crista Ampulla Cupula Bone 2Osseous labyrinth 3Membranous labyrinth The cochlear duct is a long coiled tube in a long coiled hole in the bone. The organ of Corti is a long coiled ribbon Uncoiled Membranous Labyrinth in Osseous Labyrinth The Cochlea is coiled The organ of Corti The Organ of Corti is a Ribbon Base | | Tip High Pitch Low Pitch High pitch is detected at the base of the cochlea because the basilar membrane is narrower there. Each sound frequency is detected at a specific position along the cochlea at which it resonates. Basilar membrane Pathway of Sound through the Ear Movement of Fluid in the Cochlea Movements of the basilar membrane from sound Base | | Tip High Pitch Low Pitch Basilar membrane Swings with Different Lengths of Rope Will Vibrate At Different Frequencies The Organ of Corti Two ways to make a swing go higher Pushing Pumping The Extraordinary Outer Hair Cell Ears make sound called otoacoustic emissions Mechanical Receptors of the Hair Cell Pathologies of Ears 1. Deafness 2. Vertigo 3. Tinnitus