Health knowledge : a thorough and concise knowledge of the prevention, causes, and treatments of disease, simplified for home use . es are thin spongy bones joining the lateral partsof the ethmoid and forming part of the outer walls of the nasalcavity. The vomer is a sharp-edged triangular bone dividing theposterior part of the nasal cavity in two. The two palate bonesform the posterior part of the outerwalls of the nasal cavity and theposterior part of the hard inferior maxillary bone, ormandible, is horseshoe-shaped, withprominent, flat, upturned ends,which articulate at each side
Health knowledge : a thorough and concise knowledge of the prevention, causes, and treatments of disease, simplified for home use . es are thin spongy bones joining the lateral partsof the ethmoid and forming part of the outer walls of the nasalcavity. The vomer is a sharp-edged triangular bone dividing theposterior part of the nasal cavity in two. The two palate bonesform the posterior part of the outerwalls of the nasal cavity and theposterior part of the hard inferior maxillary bone, ormandible, is horseshoe-shaped, withprominent, flat, upturned ends,which articulate at each side withthe temporal bones, forming ahinge-like joint, while the upperborder of the front horizontal partor body of the bone is armed with the teeth of the lower jaw. A child has only twenty teeth, called the milk teeth, whichbegin to appear at the age of six months and persist till aboutthe age of seven years, when they begin to fall out and to be re-placed by the permanent teeth. An adult has thirty-two teeth, comprising, from before back-ward, in each half of each jaw, two incisors, one canine, twopremolars, and three The Mandible. THE AXIAL. SKELETON 871 The Hyoid Bone.—The hyoid bone lies in the front of the neckbetween the mandible and the larynx, and is a horseshoe-shapedbone with a small body and arching wings, two prominences onthe upper surface at the extremities of the body being calledthe lesser wings. The Spinal Column.—The spinal or ver-tebral column is composed originally ofthirty-three vertebrae, but in the adult thefirst twenty-four vertebrae remain separate,the next five join together to form thesacrum, which is part of the bony girdle ofthe pelvis, and the last four fuse more orless completely to form the coccyx, orcuckoos bill. The upper seven separatevertebrae ai# termed the cervical; thenext twelve, with which the ribs artic-ulate, the dorsal; and the lower five, thelumbar. The spine, as a whole, presentstwo curves. The-^ertebrae possess a cylind
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmedicin, bookyear1920
