A text-book of first aid and emergency treatment . o walls of the skull are about one-eighth to one-fourth of aninch in thickness. In children they are ^ery much thinner,indeed, in young infants, there are certain locations on top 30 AXATOMY A PiiYsmLnaY of the head wIutc tlie skull is very thin and nienil)ran()us incharacter, luning not yet inidergone bony change. In the anterior portion of the head is the face, formed byseveral small bones which together act as a b()n\ frameworkfor the nose, cheeks, and jaws, while the forehead, on theother hand, is formed by a portion of the skull. It is im
A text-book of first aid and emergency treatment . o walls of the skull are about one-eighth to one-fourth of aninch in thickness. In children they are ^ery much thinner,indeed, in young infants, there are certain locations on top 30 AXATOMY A PiiYsmLnaY of the head wIutc tlie skull is very thin and nienil)ran()us incharacter, luning not yet inidergone bony change. In the anterior portion of the head is the face, formed byseveral small bones which together act as a b()n\ frameworkfor the nose, cheeks, and jaws, while the forehead, on theother hand, is formed by a portion of the skull. It is impor-tant to remember this relation because, in injuries to theforehead, we may expect an associated fracture of the skull. Fig. 4.—Side %iew of the lower Jaw. (Gray.) and an injury to the brain, while in injuries to the portionof the face below the eyes, coincident brain injury isuncommon. The upper teeth are located in the maxilla, or upper jaw,and the lower teeth in the mandible, or lower jaw. The Mandible.—This bone, sometimes called the inferiormaxilla, sometimes referred to simply as the jaw bone, isthe only bone of the face which is movable. It moves freelyon two joints which are situated in the skull just in front of THE BONES 31 the ears, and its motion is lim-ited chiefly to an up-and-downhinge-hke action. The Trunk.—The trunk con-sists of the spinal cohmin, theribs, and the pelvis. The Spinal Column. — Thespinal column extends from theskull to the pelvis, and servesas the bony framework of theneck and as the main support ofthe chest and abdomen. It isformed by twenty-four irregu-larly shaped disk-like bones(vertebrae), which are verystrong-, and serve for the attach-ment of the strong mu
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphialeafeb
