. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IXCRETORY ELEMENTS IN SESARMA 253 stainable in higher or lower degrees when the vacuole was deprived of most of its granular inclusions. Pictures were observed indicating a possible absorption of the intra-vacuolar granules by the cytoplasm, a fact which might explain the fuch- sinophilic character of the cytoplasm during the disappearance of the granules. ft neurosecretory cell (Figs. 9, 10. and 11). The second type of neurosecretory cells differs from the preceding one in its mode of secretory activity and in the pre- domi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. IXCRETORY ELEMENTS IN SESARMA 253 stainable in higher or lower degrees when the vacuole was deprived of most of its granular inclusions. Pictures were observed indicating a possible absorption of the intra-vacuolar granules by the cytoplasm, a fact which might explain the fuch- sinophilic character of the cytoplasm during the disappearance of the granules. ft neurosecretory cell (Figs. 9, 10. and 11). The second type of neurosecretory cells differs from the preceding one in its mode of secretory activity and in the pre- dominant affinity of the secretory material to the anilin blue component of Mallory's stain and also in the mode of secretory behavior. Cells showing this type of se- cretion were detected in the brain, the medulla terminalis and the commissural SGN >°0? O ° Uo (. NSC" B FIGURE 11. Section of the cluster of giant /3 neurosecretory cells of'the medulla terminalis (cf. Fig. 1, A). Susa, Mallory, sagittal to axis of the eyestalk. SGN, sinus-gland nerve; NPMT, neuropile of the medulla terminalis; G, secretory granules; RC, resting cell; NSC, cell in secretory activity; CB, central body formed in the cell. ganglion, but not in other ganglia. In the brain, such cells were located exclusively in a group of nerve-cells situated just anterior to the lobus olfactorius (Fig. 1, B). They, together with those found in the commissural ganglion (Fig. 1, C), are of moderate size, measuring ca. 30 ^ in length and including a vesicular nucleus of ca. 10/x in diameter (Fig. 9). Their cytoplasm is fairly homogeneous and of compact appearance, showing but slight contraction upon fixation. The cells belonging to the medulla terminalis are represented by a number of giant unipolar cells which constitute the conspicuous cluster at the ventral surface of the proximal portion of the neuropile of the medulla, dispatching nerve-fibers innervating the sinus gland. Please note that these images are ex
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
