Neurology Lab 7 - Module 1 - External, Middle and Internal Ear: Page 3 of 3

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With the below drawing as a guide, use the Highlight tool, to identify the components of the external ear and middle ear.

	The temporal bone encases the inner ear. What are the inner ear components?
Semicircular canals and the cochlea.

	Identify the pharyngotympanic tube on the cadaver. What is the other name for this tube?
Eustachian tube.

	What is the function of this tube?
Establish atmospheric equalibrium with the middle ear and our enviroment.

Notice that the jugular vein passes just beneath the temporal bone. Demonstrate this by adding the right internal jugular vein using the Anatomy icon.

	What vessels supply the middle ear? What blood vessel supplies the inner ear?
Middle ear = Tympanic branch of the maxillary artery and the mastoid branch of the occipital or posterior auricular arteries. Venous drainage is to the pterygoid plexus and superior petrosal sinus. Inner ear = Labrynthine artery and vein.