and regarded as a separate germ layer. Usually it is considered to be de-rived from the mesenchyma. After the angioblast has once been developedit sends prolongations into the embryo to form the bloodvessels. The latterthereafter never arise from mesenchymal spaces, but always as sproutsfrom the… … BV 22.—Section from tuk Hkauot \ Raprit Hmri^vo of loli Days, 4.4 .mm., to Show Mf:sfnchvma.:intl M. T., Ectodermal epithelium of the epidermis and medul-liir\- Lulie, respectively. N., nucleus; P., piotoplasm ; and I. S.,intercellular substance of a mesenchymal cell. Two of thesecells show mitotic…
Histology · Microscopy
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