. The embryology of the honey bee. Honeybee; Bees. THE EMBRYOLOGY OF THE HONEY BEE 199 changes in form. The cells of the mesodermal tubes have lost their columnar shape and from the inner layer a ridge now pro- jects abutting against the yolk, directed mesiad and ventrad, the splanchnic layer or rudiment of the enteric muscles (MclEnt). Near the mid-line the yolk has receded a trifle and the mesoderm as such has disappeared, leaving a narrow space between the ectoderm and yolk, the epineural sinus (Heymons 1895) which is partially filled with large loose cells, the blood corpuscles (BIC). At S
. The embryology of the honey bee. Honeybee; Bees. THE EMBRYOLOGY OF THE HONEY BEE 199 changes in form. The cells of the mesodermal tubes have lost their columnar shape and from the inner layer a ridge now pro- jects abutting against the yolk, directed mesiad and ventrad, the splanchnic layer or rudiment of the enteric muscles (MclEnt). Near the mid-line the yolk has receded a trifle and the mesoderm as such has disappeared, leaving a narrow space between the ectoderm and yolk, the epineural sinus (Heymons 1895) which is partially filled with large loose cells, the blood corpuscles (BIC). At Stage X (Fig. 79) the rudiments of all the mesodermal. G'ng Fig. 79. Transverse section through the third trunk segment of an embryo, Stage X, x 387. organs and tissues may readily be identified. The splanchnopleure or rudiment of the enteric muscles (MclEnt) has changed from a mere ridge to a well defined layer pressed close against the yolk. The cells of the remainder of the visceral layer have for the most part lost thir epithelial character and show a looser arrangement, in anticipation of their destiny, which is to form the two main divisions of the fat body (iF, 2F). Moreover a break in the visceral layer is seen opposite the rudiment of the tracheal trunk (TraTr). At the mesial edge of the mesoderm, close to the ganglion of this segment (Gng), two groups of extremely small cells are seen; these are the rudiments of the ventral longitudinal. 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
