may have several origins. The corpuscles pass out between thecells of the vessel walls into the mesenchyma, where they v;ander about.Whether some of them are formed by the transformation of mesenchymalcells is still discussed. Their earliest origin hke that of the vessel wallsis obscure. The… … Fig. 23—Wail of the \cii k Sac (Inthstixi;) fru.m a Chick ou the Seconi> V\\ of Incubation. (Miiiot.) Mes., Splanchnic mesoderm ; Ent.. entoderm, four distinct cells of which are shown at c, V. V., blood \ c^scls cnntaining a few \ount^ blood cells. either side, to the heart, a single median…
Histology · Microscopy
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