Volume 1

A text-book of human physiology : including histology and microscopical anatomy with special reference to the requirements of practical medicine / by L. Landois ; translated from the seventh German edition with additions by William Stirling.

Landois, L. (Leonard), 1837-1902. Lehrbuch der Physiologie des Menschen. English

Date:: 1891

Credit: A text-book of human physiology : including histology and microscopical anatomy with special reference to the requirements of practical medicine / by L. Landois ; translated from the seventh German edition with additions by William Stirling. Source: Wellcome Collection.

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$DECAY OF BLOOD-CORPUSCLES. [SeC 7. ;;;s=>r; Äri»V;-^« ^^^^^^^^^ : - red marrow and the colourless ones m /^■^ the extra-vascular parts of the marrow. ®; P W The red corpuscles are formed by the / \ \ y ^) fm) mi] mitotic division of pre-existing cells, M ftJ) ^) ^ ^ which are quite different from the ^ ^ ^ ^ colourless corpuscles; their protoplasm Fig. 13. -g j^g^gj, granular, but almost always A, Red blood-corpuscle of a chick yii^ergoing j j^^ous, never colourless, but t^^:^titt^r^ ^%My tinged by l^B^oglobin they sho^fa tHn coZrless thread of protoplasm „ever exhibit the hyely amceboicl move- still connecting the two daughter corpuscles, jngutg of the white corpuscles. 11 tlie red marrow of any of the classes of the vertebrata be examined especially after ^iXriLrorrhlges-there will always be fouml numerous erythroblasts under- Tin fdasse''of Vertebrata, then, the red marrow is the great seat of the foS^tion of U corpuscles cU„^^^^^^^^^^^^^^ Z! ^he cZrless corpuscles. If we study the fate of the red -juscles^^^^^^^ .resence is not due absolutely to any one organ. In the first phases ot •„ Tffe the red corpuscles develop and divide within the whole vascular embryonrc Ufe,ü^ r d corpu^scle^ a!rd they are developed in the liver and spleen at a later pei^ocL S ^^^^ ^.^^^ ^^^^^^^^ diS hecfaÄ But the lossl rrot absolute in the case of the last organ, dim mshed andcea ^^^^ corpuscles after copious haämorrhage. Äod-;! es aLTn no way'concerned in the formation of -d corpuscles, they have to do with the coagulation and other vital phenomena of the blood.] m e baknce of evidence points to the formation of red blood-corpusc e in tWerincTfe-both in animals with nucleated and in those wi h non-nucleated :o™ucres^^^^^^^^^ process as in embryonic life (i.e by mdirect dmsion or mitosis of a typical cellular element, which durmg extra-uterine hfe is chiefly found in the marrow of bone (BkvMzero).] 8 DECAY OF THE RED BLOOD-COEPUSCLES.-The blood-corpuscles „nderi decay within a limited time, and the liver is regarded as one of the clue unclergo decay m^^^^ disintegration occurs, because bile-pigments are formed from S^girrJ^andte blood of the hepatic vein contains fewer red corpuscles than %hfsS'pulp contains ceUs which indicate that coloured corpuscles are V. untritiiin it These are the so-called blood-corpuscle contaming cells ÄV Äe's observations go to show that the red corpuscles-which may 9 P from three to four weeks-when about to disintegrate, are taken up by he whltX-les in the hepatic capillaries, by the cells «f ^P^eeri and he ^^^raTd^ht;™^^ ää:^^ ^J^^^^ Xc:;s:i?rrq fofrformX'n of nef^^^ iu the marrow and ill the spleen, and Xo ÄtnThe liver, while a portion of the iron is excreted by the liver in the$