. Public school physiology and temperance [microform]. Physiology; Nervous system; First aid in illness and injury; Physiologie; Nerveux, Système; Premiers soins. r ' r THE SPECIAL SENSES. 141 I in their construction and articulate with perfectly formed joints, one of which is a ball-and-socket joint. At the bottom of the cavity is a small tube, leading from the middle ear to the upper and back part of the pharynx. This passage keeps up a supply of air to the middle ear. By holding the nose and keeping the mouth closed, we can force air up this passage. It enters the ear with a sudden
. Public school physiology and temperance [microform]. Physiology; Nervous system; First aid in illness and injury; Physiologie; Nerveux, Système; Premiers soins. r ' r THE SPECIAL SENSES. 141 I in their construction and articulate with perfectly formed joints, one of which is a ball-and-socket joint. At the bottom of the cavity is a small tube, leading from the middle ear to the upper and back part of the pharynx. This passage keeps up a supply of air to the middle ear. By holding the nose and keeping the mouth closed, we can force air up this passage. It enters the ear with a sudden Fio. 44.—Section through the Right Ear: Jf, outer ear; 0, auditory oanal; 7, the drum; P, middle ear; 0, bones of the ear; R, pharyngeal opening of Eustachian tube; F, vestibule; B, a semicircular canid; S, the cochlea; A, auditory nerve. • 20. The Inner Har.—This chamber is somewhat com- plex, and is sometimes called the labyrinth. It is situated in a solid bone at the base of the skull, hollowed out for the purpose, and consists of three portions — the vestibule^ or antechamber, the semidrcula/r canals^ and the cochlea, or snail shell. The vestibule, situated on the inner side of the drum, is not larger than a grain of wheat. Above and behind are three bony semicircular canalsj which communicate with the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nattress, William; Ontario. Dept. of Education. Toronto : W. Briggs
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