鼓室部 - Pars tympanica
The tympanic part is a curved plate of bone lying below the squama and in front of the mastoid process. This is the wall of the bony external acoustic meatus with the exception of the posterior, upper wall (tympanic notch).
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
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