Animal Hormones. A Comparative Survey by Penelope M. Jenkin

By Penelope M. Jenkin

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Brairiy ganglionic-X-organ and sinus gland Some of the neurosecretory cells, that release their secretion in the SINUS GLAND, have their cell bodies in the PROTOCEREBRUM of the brain and others in its extension into the TERMINAL MEDULLA of the optic lobe. The details vary for different orders and species. For instance, in the crab, Gecarcinus, the cells extend from the protocerebrum into the deutero- and tritocerebral lobes of the brain (Fig. 2-Sa-b\ Bliss and Welsh, 1952). The relatively large group of neurosecretory cells (Fig.

CELLS IN THE PARS DISTALIS OF THE ADENOHYPOPHYSIS CELLS STAIN SECRETION SECTION NO. Basophil cells beta delta >> ? PAS] and aldehyde fuchsin PAS only, peripheral ? ,, ,, central ? — TSH* FSH LH ICSH? 232 Acidophil cells alpha epsilon ? 231 # See glossary. t PAS = Periodic acid-Schiff method, with which these cells give a positive reaction. no iodine. This region is well known to secrete a melanophore dispersing hormone, intermedin, in many fish and most amphi­ bians, but not in Agnatha. It has also been claimed that this lobe may act as a storage-and-release centre for adrenocorticotrophin, A C T H (Mialhe-Voloss, 1955).

2-56 and 2-6). 112 SECRETORY CELLS FROM THE NERVOUS SYSTEM 27 verge on a half open cavity in communication with the adjacent blood sinus. In the blue crab, Callinectes, there is evidence that the sinus gland is composed of as many as five groups of axon endings, each with a distinctive staining reaction, which can be traced back along the axon (Potter, 1954). It seems highly prob­ able that these groups are responsible for secreting and releasing most of the specific chemicals with different hormonal actions, which can be found by experiment in the sinus gland.

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