A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . places, which grow more and more into thesurrounding tissues, and anastomose with each other; their protoplasmand contents disappearing, they become hollow and a branchedsystem of capillaries is formed in the tissues. Eanvier, be it remarked,noticed the same mode of growth in the omentum of newly-bornkittens. The latter observer has recently studied the development of blood-vessels and blood-corpuscles in the omentum of young rabbits. Theseanimals, whe
A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . places, which grow more and more into thesurrounding tissues, and anastomose with each other; their protoplasmand contents disappearing, they become hollow and a branchedsystem of capillaries is formed in the tissues. Eanvier, be it remarked,noticed the same mode of growth in the omentum of newly-bornkittens. The latter observer has recently studied the development of blood-vessels and blood-corpuscles in the omentum of young rabbits. Theseanimals, when a week old, have, in their omentum, little white ormilk spots ( taches laiteiises, Ranvier), in which lie vaso-formative cells, , highly refractive cells of variable shape, with long cylindricalprotoplasmic processes (Fig. 5). In its refractive power the protoplasm 14 ORIGIN OF THE RED BLOOD-CORPUSCLES. of these cells resembles that of lymph-corpuscles. Long rod-like nuclei lie within thesecells (K, K), and alsored blood - corpuscles(r, r), and both are sur-rounded with proto-plasm. These vaso-formative cells give offpoints(a, a),. Fig. 5. protoplasmicand processessome of which endfree, while others form a network. Here andFormation of red blood-corpuscles within vaso- formative cells, from the omentum of a rabbit there elongated COn-seven days old. r, r, the formed corpuscles. K, K, nective tissue-corpus-nucleiof the vaso-formative cell, a, a, processes cles lie Oil the branches,which ultimately unite to form capillaries. &nd ultimately form the adventitia of the blood-vessel. The vaso-formative cells have many forms: they may be elongatedcylinders ending in points, or more round and oval, resemblinglymph cells, or they may be modified connective tissue-corpuscles, asobserved by Schafer in the subcutaneous tissue of young rats. Thesecells are always the scat of origin of non-nucleated red blood-corpuscles,which arise in the protoplasm of vaso-formative cells, as chloroph
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
