Anatomy of the Ear Parts of the Ear

Is this your ear?

NOPE – This is the Ear!

There are three sections of the ear! OUTER MIDDLE INNER

Outer Ear Pinna -also known as the Auricle Ear Canal or External Auditory Canal

Middle Ear Tympanic Membrane - Ear Drum Eustachian Tube Three Bones known as the Ossicular Chain Malleus Incus Stapes

Inner Ear Semicircular canals Cochlea Organ of Corti 3 Chambers 2 Membranes

Review

Anatomy of the Ear Functions of the Ear

Outer Ear Pinna -also known as the Auricle. Ear Canal Made entirely of cartilage Varies in size and shape Gathers sound waves from the environment Ear Canal Lined with hair follicles to keep foreign objects out Lined with skin-supporting glands Sebaceous- secretes an oily, fatty substance is cerumen (also known as ear wax) Cerumen exits ear naturally

Middle Ear Tympanic Membrane - Ear Drum Eustachian Tube – Equalizer Must be protected, extremely thin Keeps constant temperature and humidity Vibrates when sound waves hit it Eustachian Tube – Equalizer 3 Primary Functions Helps ventilate middle ear Equalize pressure Maintain proper drainage

Middle Ear - The Ossicular Chain Malleus Incus Stapes Purpose: helps transmit sound waves from the tympanic membrane to the inner ear

Look Again.

Inner Ear Cochlea Twisting bony shell Diagrams show the inside 3 to 5 rows of thousands of tiny hairs Three Scala (or chambers) Scala Vestibuli - oval window Scala Media (cochlear duct) Scala Tympani - round window

(from here it gets really complicated so we will stop) Inside the Cochlea “Organ of Corti – Also Known As: Organ of Hearing” full length of Scala Media resides on basilar membrane lined with nerve endings come together to make 8th nerve (from here it gets really complicated so we will stop)

Inside the Cochlea Each chamber had different fluids that cannot mix – if these fluids cannot mix - will kill all nerves. These fluids separated by membranes Reissner’s Membrane Basilar Membrane

Semicircular canals The canals sit at right angles to each other, are all attached. They detect horizontal and vertical movement as well as acceleration.

How the Ear Work! https://www.youtube.com/watch?v=qgdqp-oPb1Q