Special Senses AUDITORY SENSE Auditory Sense The Ear

Special Senses AUDITORY SENSE

Auditory Sense The Ear …

Auditory Sense Pinna v Auricle – funnel like Auditory Canal v Tube v Transfers sound waves to eardrum Tympanic membrane v Eardrum v Begins vibrations from sound wave

Auditory Sense Ossicles: 1. Malleus Bones -> Hammer 2. Incus Bones -> Anvil 3. Stapes Bones -> Stirrup Video Clip

Auditory Sense Cochlea v Bony chamber v Has receptors Perilymph v Fluid within Cochlea Oval Window v Receives vibrations from stapes bone & v Transfers it to perilymph inside cochlea Round Window v Relieves inside pressure of cochlea

Balance & Equilibrium Vestibular Complex v Semicircular canal v Utricles & Saccules ü respond to movement of the body Semicircular canal v Respond to rotational movement of the head

Balance & Equilibrium Utricles & Saccules v Contains hair cells v Respond to movement Maculae v Contains hair cells v Responds to Gravity & Acceleration

Balance & Equilibrium Stereocilia & Kinocilia v Extend from receptor hair cells v Move when head moves

Balance & Equilibrium Otolith v Gelatin (otolithic membrane) & stone cells Stone cells v Calcium Carbonate v Bend receptor hair cells when head tilts v Otoconia (stones)

Balance & Equilibrium Ampulla v Swelling at the base v Contains receptors Crista v Region in Ampulla v Contains receptor cells (hair cells) Cupula v Gelatin surrounding hair cells

Review: Balance & Equilibrium ex l p ar l u m Co ib V t es Crista in Ampulla Semicircular canal Utricles, Saccules & Maculae Cupula Crista Ampulla Otolith Stone Cells Stereocilia & Kinocilia

Balance & Equilibrium

Balance & Equilibrium Eustacian tube v Equalizes pressure between the inside & outside of the ear

Hearing & Cochlear Anatomy / Physiology Video Clip

Hearing & Cochlear duct q Contains the spiral organ q Site where impulse is made Vestibular duct q Upper tube q Receives pressure waves in perilymph from Oval Window Tympanic duct q Lower tube q Pressure waves move a membrane causing hair cells to move

Hearing Video Clip Spiral Organ ü In the Cochlear duct ü Contains hair cells that sit on top if the basilar membrane Basilar Membrane ü Moves when pressure waves flow through the tympanic duct ü Causing hair cells to move Tectorial Membrane q Stationary plate that the hair cells are pushed into during pressure waves

Hearing Basilar Membrane ü Moves when pressure waves flow through the tympanic duct ü Causing hair cells to move Tectorial Membrane Hair cells Tectorial Membrane q Stationary plate that the hair cells are pushed into during pressure waves Basilar Membrane

Hearing