The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . Fig. II.—General outlines of the skull, sliowing the sutures. interruptions at the sutures tend to deaden theshock of a blow. 23. The Frontal Sinuses.—In the front of the skull there are twocavities in the sub-stance of the boneitself. These aresituated just abovethe eye-brows, andare called Xh^ fron-tal siniLscs (Fig. 12).The layer
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . Fig. II.—General outlines of the skull, sliowing the sutures. interruptions at the sutures tend to deaden theshock of a blow. 23. The Frontal Sinuses.—In the front of the skull there are twocavities in the sub-stance of the boneitself. These aresituated just abovethe eye-brows, andare called Xh^ fron-tal siniLscs (Fig. 12).The layer of boneAvhich forms theirfront wall causesthe prominencesjust over the eye-brows, and, as the cavities increase in size withage, this portion of the forehead becomes moreprominent. The cavities are lined with mucousmembrane, and areconnected with the in-side of the nose by acanal or small passage,so that, when a personhas a severe cold inthe head, the inflam-mationsometimes runsup this passage intothe frontal this is the case,the person has a dull,stuffy headache in thatlocality, due to the swelling of the mucous membrane. 24. The Ribs.—The bony part of the walls of. Fig. 12.—Frontal sinus. NATURAL SHAPE OF THE CHEST 23 the chest is made up of tzventy-four ribs and thebreast-bone, together with part of the spine are twelve ribs on each side, the first, nearestthe neck, being usually the shortest. They increasein length from the first to the seventh, and then di«minish, so that the twelfth is also quite short. Theyare flat and narrow, and are attached at one end tothe spine, in such a manner that they move easilyup and down, while the other end is attached to thebreastbone, or sternum, by means of a piece of car-tilage, varying in length with the length of the eleventh and twelfth ribs are not attached toanything at their forward end, and hence are calledfloating ribs. The ribs are attached to the spine in such a waythat all of them mov
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Keywords: ., booksubjecthumananato, booksubjecthygiene, booksubjectphysiology
