ether they are greatly thickened, and the thickened portion,by a series of transverse constrictions, becomes cut into blockdike massescalled mcsodcrmic segments (protovertebrae). They are paired structuresbordering upon the medullary tube and increasing in number by the forma-tion of new segments,… … SPS^ ., •■■■■ som. Fig. 21.—Tkansvhrsf. Section of a 25 mm. Huma.n Embrvo. (After mjti Leiiho^sck )I Cunipare this section with the upper p^^rt of the diagram, F\^ i<), I.)Ao.,.utrla; coe.. i-oeloni : ect .ectoderm ; ent., entoderm ; int.. iTitestina] cavity : med. t., medullarNtulx^;nch..…
Histology · Microscopy
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