. The embryology of the honey bee. Honeybee; Bees. Fig. 83. Transverse sections through the dorsal region of the fourth trunk segment of late embryos, illustrating the final stages in the develop- ment of the heart. A, Stage XIII-XIV; B, XIV, x 600. of the heart in the fourth trunk segment of Stages XIII-XIV and XIV. In the first figure (83A), the cardioblasts (CM) form two strips or strands of cells, each situated a short distance laterad of the mid-line, and with their mesial edges directed slightly dorsad. The rudiment of the dorsal diaphragm (DDpJi), consist- ing of a single layer of cells
. The embryology of the honey bee. Honeybee; Bees. Fig. 83. Transverse sections through the dorsal region of the fourth trunk segment of late embryos, illustrating the final stages in the develop- ment of the heart. A, Stage XIII-XIV; B, XIV, x 600. of the heart in the fourth trunk segment of Stages XIII-XIV and XIV. In the first figure (83A), the cardioblasts (CM) form two strips or strands of cells, each situated a short distance laterad of the mid-line, and with their mesial edges directed slightly dorsad. The rudiment of the dorsal diaphragm (DDpJi), consist- ing of a single layer of cells, projects on each side from the lateral border of the cardioblasts. On the right hand side of this figure, a narrow ridge projects out from the cardioblasts, just below the dorsal diaphragm. This is the last vestige of the former union of the cardioblasts and the remainder of the splanch- nopleure. In the next figure (83B) the mesial edges of the cardio- blasts of each side have approached one another until they are on the point of meeting. The former lateral margins of the cardioblasts have meanwhile also moved rapidly mesiad and have been turned about or "tucked under," so that they also are now directed mesiad and almost in contact with one another. In transverse sections therefore the cardioblast strand of each side is. 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 Nelson, James Allen. Princeton : Princeton University Press
Size: 2558px × 977px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectbees, bookyear1915
