Mechanoreception (the ear)

STRUCTURES OF THE EAR Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR Outer Ear Consist of Pinna and auditory canal Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR-Outer EAR Pinna Is the outside flap of the ear Made of skin and cartilage Shaped in a way that enhances sound vibrations Focuses them into the ear Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR-Outer EAR Auditory Canal Is a tube (2.5 cm long) Leads to the eardrum-tympanum Hairs & earwax secreted by glands

STRUCTURES OF THE EAR-Outer EAR Auditory Canal Hairs & earwax secreted by glands Prevent Dust Insects Bacteria Other foreign materials From proceeding deeper into the ear

STRUCTURES OF THE EAR-Outer EAR Should you use swaps to clean out earwax?

STRUCTURES OF THE EAR-Middle EAR Is an air-filled space that is bordered on one side by the tympanum (eardrum) Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR-Middle EAR EAR DRUM Is an air-filled space that is bordered on one side by the tympanum (eardrum) Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR-Middle EAR EAR DRUM Elastic structure that vibrates in response to sound waves Tympanum= Greek word for drum Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR-Middle EAR Ossicles Three tiny, interconnected bones in the middle ear Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR-Middle EAR Ossicles Each bone acts as a lever for the next Small movement in one results in a larger movement in the next Tympanum (ear drum) Auditory canal

STRUCTURES OF THE EAR-Middle EAR Stapes concentrates vibrations into Oval window

STRUCTURES OF THE EAR-Middle EAR Oval window Membrane-covered opening In the wall of the inner ear Tympanum is 15-30X larger Oval window Amplify vibrations

STRUCTURES OF THE EAR-Middle EAR Eustachian tube Middle ear connected to throat by the eustachian tube Read p. 420 What is the role of the eustachian tube?

STRUCTURES OF THE EAR-Inner EAR Consist of three interconnecting structures Semicircular canals Vestibule Cochlea

STRUCTURES OF THE EAR-Inner EAR Semicircular canals Vestibule Cochlea