. Human embryology and morphology. Embryology, Human; Morphology. trans, proa dors, head rib vent, head Flo. 123.—The Bicipital Rib of a Lower Vertebrate (crocodile). by a separate- centre of ossification. The costal process of the 7 th may develop into a rudiment or even a fully formed rib which reaches the sternum. In the lumbar vertebrae only the first shows a separate centre for the formation of the costal process; it fuses with the tip of the transverse process in the later months of foetal life; in the other lumbar vertebrae the tips or perhaps the whole of the transverse processes repre
. Human embryology and morphology. Embryology, Human; Morphology. trans, proa dors, head rib vent, head Flo. 123.—The Bicipital Rib of a Lower Vertebrate (crocodile). by a separate- centre of ossification. The costal process of the 7 th may develop into a rudiment or even a fully formed rib which reaches the sternum. In the lumbar vertebrae only the first shows a separate centre for the formation of the costal process; it fuses with the tip of the transverse process in the later months of foetal life; in the other lumbar vertebrae the tips or perhaps the whole of the transverse processes represent costal processes. The 12th dorsal rib varies widely in size; it may be six inches or ten long or reduced to a mere vestige. In the 1st, 2nd and 3rd sacral vertebrae the costal processes are large and have their own centres of ossification. Their cartila- ginous bases fuse early to form the greater part of the lateral masses of the sacrum (Fig. 115). The part of the lateral mass neural arch trans, proa cost, proa epiphysis centrum Fia. 124.—A section to show the Nature of the Elements composing the Sacrum. formed by the costal processes is shown in Fig. 124. The costal processes are absent in the 4th and 5th sacral and all the coccygeal vertebrae. The two lateral epiphyseal plates on each •side of the sacrum are new and independent formations. The Accessory Processes are found in the lumbar and lowest two. 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 Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
