File:Radiography, x-ray therapeutics and radium therapy (1915) (14571491799).jpg

Identifier: radiographyxray00knox (find matches)
Title: Radiography, x-ray therapeutics and radium therapy
Year: 1915 (1910s)
Authors: Knox, Robert, 1868?-1928
Subjects: Radiography Radiotherapy
Publisher: New York, Macmillan
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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ppears very early,before any other hone; according to Beclard, as early as the thirtieth day.The centre for the sternal end makes its appearance about the eighteenth ortwentieth year, and unites with the rest of the bone about the twenty-fifthyear. The Scapula.—Development takes place by seven centres: one for thebody, two for the coracoid process, two for the acromion, one for the pos-terior border, and one for the inferior angle. Ossification of the body of thescapula commences about the second month of foetal life by the formation ofan irregular plate of bone immediately behind the glenoid cavity. This plateextends itself so as to form the chief part of the bone, the spine growing upfrom its posterior surface about the third month. At birth the chief part ofthe scapula is osseous, the coracoid and acromion processes, the posteriorborder and inferior angle being cartilaginous. About the first year afterbirth ossification takes place in the middle of the coracoid process, which 138
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PLATE VII.—Normal Elbow and Fractures in Region of Elbow-joint. a, Normal elbow-joint, antero-posterior loositiou. b, Injury to epiphysis of olecranon. c, Normal elbow-joint, lateral position. d, Fracture through olecranon process. THE UPPER EXTREMITY 139 usually becomes joined with the rest of the bone at the time when the othercentres make their appearance. Between the fifteenth and seventeenthyears ossification of the remaining centres takes place in quick succession,and in the following order : first, near the base of the acromion and in theroot of the coracoid process, the latter appearing in the form of a broad scale ;secondly, in the inferior angle and contiguous part of the posterior border ;thirdly, near the extremity of the acromion ; and fourthly, in the posteriorborder. The acromion process, besides being formed of two separate nuclei,has its base formed by an extension into it of the centre of ossification whichbelongs to the spine, the extent of which varies in differe

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