BIOL 430 Lecture Notes - Lecture 20: Tectorial Membrane, Vestibular Duct, Cochlear Duct
Document Summary
Sits on the basilar membrane and is partially covered by the tectorial membrane, both flexible tissues that move in response to fluid waves passing through the vestibular duct. As the waves travel through the cochlea they displace basilar and tectorial membranes, creating and up-and-down oscillations that bend the hair cells. Hair cells are non-neural receptor cells the apical surface of each hair cell is modified into stiffened cilia known as stereocilia, arranged in ascending heights. When the hair cells and cilia are in neutral position 10% of ion channels are. Voltage gated ca channels open, nt release increases, and the sensory neuron increases its firing rate. When the tectorial membrane pushes the cilia away from the tallest member tip. Cation influx slows and the membrane hyperpolarizes, less transmitter is links relax and the ion channels close released, and sensory neuron firing decreases. Vibration pattern of waves reaching the inner ear pattern of action potentials going to the cns.
