. The embryology of the honey bee. Honeybee; Bees. THE EMBRYOLOGY OF THE HONEY BEE 195 body cavity, except in the intersegmental regions, where it extends laterad to the hypodermis, to which it is attached (Fig. 76,. Fig. 76. Transverse section through the dorsal region of the trunk, between the 5th and 6th trunk segments, showing the attachment of the dorsal diaphragm (DDph) to the hypodermis, x 600. DDph). This relation is clearest in the third to the ninth trunk segments inclusive, but undoubtedly also exists in the first two (thoracic), although masked here by the crowded condition of the
. The embryology of the honey bee. Honeybee; Bees. THE EMBRYOLOGY OF THE HONEY BEE 195 body cavity, except in the intersegmental regions, where it extends laterad to the hypodermis, to which it is attached (Fig. 76,. Fig. 76. Transverse section through the dorsal region of the trunk, between the 5th and 6th trunk segments, showing the attachment of the dorsal diaphragm (DDph) to the hypodermis, x 600. DDph). This relation is clearest in the third to the ninth trunk segments inclusive, but undoubtedly also exists in the first two (thoracic), although masked here by the crowded condition of the parts and the large number of pericardial fat cells. The muscle fibres constituting the dorsal diaphragm of most insects, includ- ing the honey bee (imago), are commonly described as radiating fanwise from the points of origin to their attachment on the heart {vide Snodgrass, 1910, p. 108), but in the young larvae no muscle fibres could be seen in the dorsal diaphragm, which appears in both longitudinal and tranverse sections as a continuous and extremely thin membrane. The cells constituting the dorsal diaphragm are of two kinds; numerous flat cells with minute nuclei (Fig. 70), appearing to be the diaphragm cells proper, and pale lenticular cells whose size approximates that of the fat cells (Fig. 76 ParC). An examina- tion of the text and figures of Carriere and Burger's (1897) account of the dorsal diaphragm of Chalicodoma makes it evident that the cells just described are identical with those constituting the "paracardial cellular cord" (paracardial Zellstrang). This term was first used by Heymons (1895) to designate segmentally. 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
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectbees, bookyear1915
