BIO210Y5 Lecture Notes - Lecture 17: Endolymph, Basilar Membrane, Cranial Nerves
Document Summary
Middle: tympanic membrane, cavity, ossicles & muscles. First membrane - what sound would reach first. More interior to tympanic membrane is the tympanic cavity. Cranial nerve 8 - responsible for sending messages through nerve signals to. Internal: semicircular canals, labyrinths, auditory tube, sensory organs the brain (vestibulocochlear nerve) Membranous labyrinth: network of fluid-filled tubes (fluid: endolymph) Every time cupula moves in different direction the hair cell also moves. Direction relative endolymph movement with cause change in direction of cupula. Gravity & accelleration: hair cells in utricle and saccule. Vestibular complex: semicircular ducts, utricle & saccule. 5. vibration of hair cells against tectorial membrane. 6. signal travels via cranial nerve viii (vestibulocochlear nerve) Stereocilia follow the kinocilia - cell receptor is stimulated. Kinocilia (resemble cilia, not in organ of corti) 1. pressure wave distorts the basilar membrane creating a pressure. 2. mechanically gated potassium channels open and potassium. 3. calcium enters cell and activates neurotransmitter release into.
