Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 597
The middle ear communicates with the external air bymeans of the Eustachian tube E (Fig. 393). extending intothe upper part of the throat, but generally closed except inthe act of swallowing. By closing the mouth and nostrilsand compressing the air in the pharyngeal cavity, the tubemay be forced… … Mm Fig. 394. AXATOMT OF THE EAR. 537 The internal ear, or labyrinth, is a partly membranous andpartly bony organ embedded in yery dense bone and filledwith a watery fluid. It consists of three parts: the yesti-bule, p (Fig. 393); the semicircular canals. //. vj>. va: and thecochlea, c. The outer…
Physics
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