. The elements of Embryology. Embryology. 34 PRELIMINARY ACCOUNT. Fig. 10. [chap. Diagrammatic Longitudinal Section through the Axis of AN Embryo. The section is supposed to be made at a time when the head- fold has commenced but the tail-fold has not yet appeared. F. So. fold of the somatopleure. F. Sp. fold of the splanchnopleure. The line of reference F. So. is placed in the lower bay, outside the embryo. The line of D is placed in the upper bay inside the embryo ; this wiU remain as the alimentary canal. Both folds {F. So., F. Sj).) are parts of the head-fold, and are to be tho
. The elements of Embryology. Embryology. 34 PRELIMINARY ACCOUNT. Fig. 10. [chap. Diagrammatic Longitudinal Section through the Axis of AN Embryo. The section is supposed to be made at a time when the head- fold has commenced but the tail-fold has not yet appeared. F. So. fold of the somatopleure. F. Sp. fold of the splanchnopleure. The line of reference F. So. is placed in the lower bay, outside the embryo. The line of D is placed in the upper bay inside the embryo ; this wiU remain as the alimentary canal. Both folds {F. So., F. Sj).) are parts of the head-fold, and are to be thought of as continually travelling onwards (to the left) as de- velopment proceeds. pp. space between somatopleure and splanchnopleure : pleuro- peritoneal cavity. Am. commencing (head) fold of the amnion. A fuller explanation is given under Fig. 29. figures), the level is maintained for some distance, and then there is a sudden descent, the blastoderm bending round and pursuing a precisely opposite direction to its previous one, running backwards instead of forwards, for some distance. It soon, however, turns round again, and once more running forward, with a gentle ascent, regains the original level. As seen in section, then, the blasto- derm at this spot may be said to be folded up in the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Foster, M. (Michael), Sir, 1836-1907. London, MacMillan
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