Quain's elements of anatomy . Fig. 720.—Transverse sec-tion THROUGH THE EMBRYOOP the CHICK AND BLASTO-DERM AT THE END OPTHE FIRST DAY. MAGNIFIEDFROM 90 TO 100 TIMES, (From Kolliker.) Fig. «fj> £^tvh d il ti up ^^ Ji, epiblast; dd, hypoblast; sp, mesoblast; Pv, medullary groove ; m, medullaryplates ; ch, chorda dorsalis ; tuvp, proto-vertebral plate; uicli, commencement of divisionof mesoblast into its upper and lower laminte ; between Rf and h the dorsal laminse orridges which by their approximation close in the medullary canal. primary divisions of the brain. The spinal portion retai
Quain's elements of anatomy . Fig. 720.—Transverse sec-tion THROUGH THE EMBRYOOP the CHICK AND BLASTO-DERM AT THE END OPTHE FIRST DAY. MAGNIFIEDFROM 90 TO 100 TIMES, (From Kolliker.) Fig. «fj> £^tvh d il ti up ^^ Ji, epiblast; dd, hypoblast; sp, mesoblast; Pv, medullary groove ; m, medullaryplates ; ch, chorda dorsalis ; tuvp, proto-vertebral plate; uicli, commencement of divisionof mesoblast into its upper and lower laminte ; between Rf and h the dorsal laminse orridges which by their approximation close in the medullary canal. primary divisions of the brain. The spinal portion retains a moreuniform cylindrical shape, excepting towards the caudal extremity,where it is longer in being formed, and remains for a time a flat openrhomboidal dilatation. The continuous cavity enclosed within theprimitive medullary tube is the same with that which, variously modi- 3 o 2 820 THE NERYOUS SYSTEM. fied, afterwards constitutes the central ventricles of the brain and canalof the spinal cord. The formative cells composing the medullary substance are at first Fig. 721.
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
