. La biologie de la grenouille. Les grenouilles. Histologie DE LA GRENOUILLE 131 en faisant une section transversale du fémur. La partie centrale de l'os est creux et rempli de moelle osseuse, et la surface extérieure est recouverte d'une couche de périoste, qui est similaire à la structure de l'perichondrium entourant le cartilage. La substance osseuse est organisé en couches concentriques, ou lamellce lacunce, qui contiennent de nombreuses, dans laquelle se trouvent les cellules osseuses. Les lacunes de la ramification fine tubes, ou les processus de canalicules, contenant les cellules osseuses, sont libérés ex- tendent dans toutes les directions et s'anastomosent avec les canali

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. The biology of the frog. Frogs. HISTOLOGY OF THE FROG 131 by making a cross section of the femur. The central part of the bone is hollow and filled with marrow, and the outer surface is covered by a layer of periosteum, which is similar in structure to the perichondrium surrounding the cartilage. The bony substance is arranged in concentric layers, or lamellce, which contain numerous lacunce, in which lie the bone cells. From the lacunae fine branching tubes, or canaliculi, containing processes from the bone cells, are given off which ex- tend in all directions and anastomose with the canaliculi of neighboring spaces. Bones increase in thickness by the ad- dition of successive layers to the outside. The osteoblasts, or cells forming the in- ner layer of the pe- riosteum, give rise continually to new bone c e 11 s which cause the deposition of new layers of bony substances between the periosteum and the old bone. New layers may also be added from with- in by a layer of cells lining the inner surface of the walls of the marrow cavity. Muscle is composed of elongated cells or muscle fibers united by connective tissue. Two varieties of muscle are commonly distinguished, the striated, or so-called voluntary, and the unstriated, or involuntary. In the latter the cell structure is relatively simple; the fibers are commonly. Fig. 45.—A part of a cross section of the femur of the frog, c, canaliculi; Ic, la- cunae ; Im, lamellse; m, marrow cavity. (After Parker and Parker.). 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 work.. Holmes, Samuel J. (Samuel Jackson), 1868-. New York : The Macmillan company

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