Histological and histochemical observations of the cephalic neurosecretory system of the crab, Paragrapsus Gaimardii (H. Milne Edwards)

Anatomical, cytological and histochemical features of
the neurosecretory system of the crab, Paragrapsus
gaimardii are described, In the brain and the commissural
ganglia, three types of neurosecretory cells are distinguished,
The distribution of these cells in the brain
and the commissural ganglia is described. In the eyestalk,
four types of neurosecretory cells are identified and the
distribution of these cells is described. The neurosecretory
cells of the brain, the commissural ganglia, and of
the eyes talks are all paraJdehyde fuchsin – positive (PFpositive),
Their tinctorial properties with the chrome,
haematoxylin phloxine technique are described. The
neurohaemaJ organ of the eyestalk, the sinus gland, is
described both as regards its anatomical characters and
its staining properties. The presence of allochthonous
cells in the sinus gland is revealed, The allochthonous
neuroglial cells of the sinus gland do not appear to be active gliosecretory cells, However, some of the
neuroglial cells of the brain, especially those of the
protocerebrum, do appear to be active gliosecretory
cells. The neurosecretory material of the cephalic neurosecretory
system of P. gaimardii is proteinaceous with
disulphide groups being markedly present