. Comparative anatomy. Anatomy, Comparative. DIAPHYSIS- --MARR0W PERICHONDRIAL BONE ENDOCHONDRAL BONE ^ GROWTH DISC. Fig. 212.—Diagrams illustrating four stages in the development of a long bone. Perichondral bone cross-hatched; endochondral bone stippled; marrow black; cartilage unshaded. (Redrawn from Coming's "Human Embryology," after Duval.) the third phalanx of the fingers. At this stage, however, it is impossible to distinguish sharply individual elements, and the cartilage of the entire appendicular skeleton is virtually continuous. Ossification begins in the seventh week but
. Comparative anatomy. Anatomy, Comparative. DIAPHYSIS- --MARR0W PERICHONDRIAL BONE ENDOCHONDRAL BONE ^ GROWTH DISC. Fig. 212.—Diagrams illustrating four stages in the development of a long bone. Perichondral bone cross-hatched; endochondral bone stippled; marrow black; cartilage unshaded. (Redrawn from Coming's "Human Embryology," after Duval.) the third phalanx of the fingers. At this stage, however, it is impossible to distinguish sharply individual elements, and the cartilage of the entire appendicular skeleton is virtually continuous. Ossification begins in the seventh week but is not completed in all bones of the body until the twenty-fifth year. Ossification of the clavicle begins before the third month, but in the coracoid process not before the end of the first year, and of the acromium process only at puberty. The shaft or diaphysis of the humerus is usually the only portion ossified at birth. The distal epiphysis fuses with the diaphysis during the sixteenth year and the proximal epiphysis during the 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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