BIOL 2301 Ch 19 Lecture Outlines PDF

Chapter 19: Specialized Sensory Receptors - Hearing and Equilibrium The Ear Outer, Middle and Internal Ear Outer ear auricle or pinna external auditory or acoustic meatus tympanic membrane short narrow chamber, 2.5 cm long and 0.6 cm wide wax-sec...

Chapter 19: Specialized Sensory Receptors - Hearing and Equilibrium The Ear Outer, Middle and Internal Ear Outer ear auricle or pinna external auditory or acoustic meatus tympanic membrane short narrow chamber, 2.5 cm long and 0.6 cm wide wax-secreting glands Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Middle ear tympanic membrane (ear drum) tympanic cavity oval window round window auditory tube middle ear ossicles stapedius and tensor tympani muscles Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Inner ear Bony Labyrinth lies in temporal bone channels in the bone perilymph Membranous Labyrinth interconnecting membranous sacs and ducts (within bony labyrinth) endolymph Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Cochlea coils for 2 and 1/2 turns around a bony pillar cochlear duct ends blindly spiral organ or organ of Corti three chambers: scala vestibuli, scala media, scala tympani Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Excitation of Hair Cells hair cells hair-like stereocilia tectorial membrane basilar membrane flutters and causes distortion of stereocilia Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Sound transduction deformations in the basilar membrane transduction into nerve impulse by hair cells hair cells located on the basilar membrane stereocilia protrude from the hair cell Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Sound and Mechanism of Hearing Properties of sound pressure wave needs a medium to travel Wavelength Frequency (20 to 20,000 Hz) Pitch Amplitude Loudness Normal hearing range Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Vestibule: central egg-shaped part, posterior to cochlea saccule and utricle equilibrium receptors (macula, otoliths) gravity receptors detect horizontal and vertical acceleration Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat  Semicircular canals: anterior, posterior, and lateral (horizontal) each with ampulla motion sensors (crista ampullaris, cupula) detect rotational (angular) movements of head Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat Deafness Conduction deafness Sensorineural deafness Tinnitus ringing sound in the absence of auditory stimulus Meniere’s Syndrome labyrinth disorder affects both semicircular canals and cochlea attacks of vertigo, nausea, vomiting, progressive hearing loss drain excess of endolymph Brief outlines only. For details, please refer to the BIOL 2301 Lecture Text on Top Hat