. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 164 DEVELOPMENT OF THE VERTEBRA are reduced to short flat plates, which unite together to form the lateral masses of the sacrum, and, finally, in the coccygeal region the blastemic costal processes of the first vertebra unite with the trans- verse processes to form the transverse processes of the adult vertebra, but no indications of them are to be found in the other vertebrae beyond the blastemic stage. The third stage in the development of the axial skeleton begins with the ossification of
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. 164 DEVELOPMENT OF THE VERTEBRA are reduced to short flat plates, which unite together to form the lateral masses of the sacrum, and, finally, in the coccygeal region the blastemic costal processes of the first vertebra unite with the trans- verse processes to form the transverse processes of the adult vertebra, but no indications of them are to be found in the other vertebrae beyond the blastemic stage. The third stage in the development of the axial skeleton begins with the ossification of the cartilages, and in each vertebra there are typically as many primary centers of ossification as there were originally cartilages, except that but a single center appears in the body. Thus, to take a thoracic vertebra as a type, a center appears in each half of each vertebral arch at the base of the transverse process and gradually extends to form the bony lamina, pedicle, and the greater portion of the transverse and spinous processes; a single center gives rise to the body of the vertebra; and each rib ossifies. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. Philadelphia : P. Blakiston's son & co.
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Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
