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By Penelope M. Jenkin

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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.

Thomsen, 1954). FIG. 2-14. ) through the outer cell surface (cf. Figs. 4-7 and 4-8). , blood vessel, c , capsule of con­ nective tissue, (c) Mesodermal cells, forming part of ADRENAL COR­ TEX; they are shown in close contact with each other, and with capillaries of the blood supply (cf. Fig. 2-15). ) is shown after removal of all fat, which is abundant in living cortical cells (after Maximow and Bloom, 1942 and Pauly, 1957). 112 SECRETORY CELLS FROM THE NERVOUS SYSTEM 23 The epistellar body is of interest, not only because the term neurosecretory was first used in this country to describe its cells, but also because it provided some of the earliest evidence for the conversion of neurons into secreting cells in an invertebrate (Young, 1936).

Unlike most neurosecretory cells of the arthropods, those of the hypothalamus of vertebrates possess dendrites (Fig. 2-16). In fish and aquatic Urodela their axons are not well developed and their function is uncertain; but in all terrestrial vertebrates from the terrestrial Urodela and Anura upwards the axons pass down the infundibular stalk to end in an enlarged neural lobe (pars nervosa). This becomes distinct from the median eminence at the base of the infundibulum and is not present in the lower forms (Fig.

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