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URL:https://www.learndesk.us/class/5691831830446080/lesson/0a9700dc234b08ba1263fd8fb70ea290?ref=outlook-calendar
SUMMARY:9.1 Ear/Hear
DTSTART;TZID=America/Los_Angeles:20260407T190000
DTEND;TZID=America/Los_Angeles:20260407T200000
LOCATION:https://www.learndesk.us/class/5691831830446080/lesson/0a9700dc234b08ba1263fd8fb70ea290?ref=outlook-calendar
DESCRIPTION: 

The ear has two main functions, hearing, and equilibrium (or balance). There are three parts to the ear: the external ear, the middle ear, and the inner ear. Each of the three parts serves a definitive function in hearing; however, the inner also functions in balance.
The external ear The pinna is made up of cartilage covered by skin. It collects the sound which is transmitted through the auditory canal, leading to the tympanic membrane or eardrum. The auditory canal contains hairs and ceruminous (wax) glands.

The middle ear lies in a cavity in the temporal bone. It is connected with the nasopharynx by the Eustachian tube, which opens upon swallowing to allow air to enter the middle ear, thus equalizing pressure on both sides of the tympanic membrane. There are three small bones in the middle ear called auditory ossicles which are connected to form a small lever between the tympanic membrane and the oval window (fenestra cochlea). The auditory ossicles are named according to...

https://www.learndesk.us/class/5691831830446080/lesson/0a9700dc234b08ba1263fd8fb70ea290?ref=outlook-calendar
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