. Quain's elements of anatomy . 790 FEAMEWOEK OF THE BODY. middle, and later both forwards and backwards, so as to effect the unionalong the whole dorsal line, except at the hinder incomplete part. Bythis union the medullary plates and groove are converted into the neuralor medullary tube, wdiich constitutes the primaiy form of the brain andspinal marrow. Fiff. 683. ■ - Jtj>. J^p A^j-uh, P alt Fig. 683.—Tkansverse sec-tion THROUGH THE EMBRYOOP THE CHICK AND BLASTO-DERM AT THE END OF THE FIRST DAT. Magnified from90 to 100 times. (FromKiiliiker.) lb, epiblast; dd, hypoblast; sp, mesoblast; Pv

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. Quain's elements of anatomy . 790 FEAMEWOEK OF THE BODY. middle, and later both forwards and backwards, so as to effect the unionalong the whole dorsal line, except at the hinder incomplete part. Bythis union the medullary plates and groove are converted into the neuralor medullary tube, wdiich constitutes the primaiy form of the brain andspinal marrow. Fiff. 683. ■ - Jtj>. J^p A^j-uh, P alt Fig. 683.—Tkansverse sec-tion THROUGH THE EMBRYOOP THE CHICK AND BLASTO-DERM AT THE END OF THE FIRST DAT. Magnified from90 to 100 times. (FromKiiliiker.) lb, epiblast; dd, hypoblast; sp, mesoblast; Pv, raecliillaTy groove; m, medullaiyplates; ch, chorda dorsalis ; uitp, proto-vertebral plate; moh, commencement of divi-sion of mesoblast into its npper and lower lamince ; between Rf and h are the dorsallaminte or ridges which by their approximation close in the medullary canal. Fig. 684.

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