File:Anatomy, physiology and hygiene (1890) (14762051004).jpg

Identifier: anatomyphysiolog00mayc (find matches)
Title: Anatomy, physiology and hygiene
Year: 1890 (1890s)
Authors: May, Charles Henry, 1861-1943
Subjects: Human anatomy Physiology Hygiene, Popular. (from old catalog)
Publisher: New York, W. Wood and company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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wo jaws, the upper(7, Fig. 13) and the lower (9,Fig. 13); the upper jaw is firm-ly joined to the rest of theskull; the lower jaiv resemblesa horse-shoe in shape, and isseparate from the rest of theskull—of course, during life, itis connected to the sides of theface by strong bands and mus-cles. Each jaw has a circularrow of teeth, about which morewill be said in the chapter onDigestion ; between these tworows of teeth is the opening ofthe mouth. 37. The skull rests upon theupper end of the spinal col-umn ; it is very movable, sothat it can be bent forward orbackward, or from side to side, Fig. 14.—The Spinal Fig. 15.-The Spinal aTlfq Pfiri l-,p fnrnPf! in miv flirpr-Column, as Seen Column as Seen anCl Can De rUinea m anJ <*irec- from Front. from the Side. tion 38. Bones of the Trunk.—The bones of the trunk are:the bones forming the spinal column, the hip-bone, the collar-bone, the shoulder-blade, the breast-bone, and the ribs. 39. The Spinal Column.—This is the row of bones
Text Appearing After Image:
THE FRAMEWORK OR SKELETON. 31 which extends from the skull above to the lower limbs below.There are thirty-three of these bones piled one upon the other;but in the grown person there are fewer, because the nine low-est bones unite so as to form two bones; five go to form theupper one, called the sacrum, and four unite to form the tip ofthe spinal column, called the coccyx. So that there are reallyonly twenty-six bones in the spinal column. Each of thesetwenty-six bones is called a vertebra, and all of them taken to-gether are known as the verte-brae. The spinal column isoften called the backbone, onaccount of its extending alongthe middle of the back. Thevertebrse are connected bycircular plates of gristle orcartilage, and by fibres ; thiscartilage and the fibres areelastic, and thus it is thatour backbone is very mova-ble—we can bend it in anydirection or twist it; this isbecause this cartilage gives.This also explains why it isthat at night we are a trifleshorter than in the morni

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