. The anatomy of the human body. Human anatomy; Anatomy. 110 OSTEOLOGY. first sight be confounded with a pisiform, or a sesamoid bone, or still more readily with a piece of the coccyx. Comparison of the Upper and Loivcr Extremities with regard to Development. The development of the lower extremities is proportionally less rapid than that of the upper. The clavicle and the scapula are ossified before the os innominatum. The os- sification of the skeleton commences in the clavicle ; in this bone, the osseous nodule is visible from the twenty-fifth to the thirtieth day ; it appears in the scapula
. The anatomy of the human body. Human anatomy; Anatomy. 110 OSTEOLOGY. first sight be confounded with a pisiform, or a sesamoid bone, or still more readily with a piece of the coccyx. Comparison of the Upper and Loivcr Extremities with regard to Development. The development of the lower extremities is proportionally less rapid than that of the upper. The clavicle and the scapula are ossified before the os innominatum. The os- sification of the skeleton commences in the clavicle ; in this bone, the osseous nodule is visible from the twenty-fifth to the thirtieth day ; it appears in the scapula about the for- tieth day. The osseous point of the ilium is visible about the forty-fifth day, that of the ischium in the third month, and that of the pubes in the fifth month. The scapula is completely ossified at the age of twenty years ; the marginal process of the crest of the ilium is scarcely united until the twenty-fifth year. The bony centres of the shafts of the femur and humerus are almost simultaneous in their appearance. The germ of the lower end of the femur always exists at birth ; that of the lower end of the humerus does not appear until the end of the first year ; but this latter unites with the bone at eighteen years, while the former is still separate at twenty years. The tibia is ossified a little be- fore the bones of the forearm, the fibula a little after them. The ossification of the leg and the forearm is completed almost about the same time. The ossification of the bones of the tarsus precedes that of the carpus by a considerable period. Thus, at from four and a half to five months of foetal life, a bony point is visible in the os calcis, and some days after in the astragalus ; the os magnum and os cuneiforme (which, however, are not the representatives of the preceding) do not show ossific points until a year after birth. The pisiform bone is not ossified until the twelfth year; while the latest of the tarsal bones, the scaphoid, is converted into bon
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