The American journal of anatomy . a Fig. ^ : Fig. 6. A. punctatum, in a stage slightly advanced over that in Fig. sagittal section of hypophysis. Borax carmine. Fig. 7. A. punctatum, at the height of the hypophysial invagination beforeseparation from ectoderm. Note the concavity of hypophysis and the absenceof ectoderm from the month plate. Hsemalum. below). As the hypophysis pushes in, its thin posterior or ventralwall is devoid of cells, and soon the cavity of the hypophysial invagi-nation is bounded on that side by entoderm (Figs. 6 and 7). Thehypophysis appears as a hook-shape
The American journal of anatomy . a Fig. ^ : Fig. 6. A. punctatum, in a stage slightly advanced over that in Fig. sagittal section of hypophysis. Borax carmine. Fig. 7. A. punctatum, at the height of the hypophysial invagination beforeseparation from ectoderm. Note the concavity of hypophysis and the absenceof ectoderm from the month plate. Hsemalum. below). As the hypophysis pushes in, its thin posterior or ventralwall is devoid of cells, and soon the cavity of the hypophysial invagi-nation is bounded on that side by entoderm (Figs. 6 and 7). Thehypophysis appears as a hook-shaped membrane (sagittal section) 50 ,T. I!. Johnston. extending in from the deeper Layer of the A slight cavityis contained within the recurved wall at the deeper end (Fig. 7),the rest of the ventral wall being formed by entoderm. While the hypophysis is pushing in, the preoral entoderm is pushedback, flattened, and its cavity nearly obliterated. This cavity be-r, iines less prominenl before the closing up of the entodermal month K
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1910
