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The elements of embryology. Embryology; Embryology. X.] THE HUMAN EMBRYO. 339 The embryo is still but incompletely folded off from the yolk-sac below. In a still older stage the cranial flexure
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![A laboratory manual and text-book of embryology. Embryology. Fig. 77.—Human embryo at the commencement of the third week (from His, after Coste). X 15. A, inner or true amnion; A.s., body-stalk; //, A laboratory manual and text-book of embryology. Embryology. Fig. 77.—Human embryo at the commencement of the third week (from His, after Coste). X 15. A, inner or true amnion; A.s., body-stalk; //,](https://c8.alamy.com/comp/RE07CJ/a-laboratory-manual-and-text-book-of-embryology-embryology-fig-77human-embryo-at-the-commencement-of-the-third-week-from-his-after-coste-x-15-a-inner-or-true-amnion-as-body-stalk-heart-v-blood-vessel-on-yolk-sac-ys-yolk-sac-amnion-branchial-clefts-1-3-body-stalk-maxillary-process-mandibular-process-heart-yolk-sac-fig-78human-embryo-26-mm-long-showing-amnion-yolk-stalk-and-body-stalk-his-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrati-RE07CJ.jpg)