By Penelope M. Jenkin

ISBN-10: 0080095844

ISBN-13: 9780080095844

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2) in many Decapoda. In the prawns, Leander and PenaeuSy it has been shown (Knowles, 1953 and 1954) that the attached POST-COMMISSURE ORGANS are the swollen bases of nerves, some motor fibres of which pass to dorsoventral muscles ; the two nerves have a cross connection and contain many neurosecretory fibres and secretory droplets and yield an active extract. Some of the cell bodies are in the commissure (Fig. 2-5c). The CIRCUMOESOPHAGEAL CONNECTIVES and the thoracic and abdominal ganglia also yield extracts of varying activity, particu­ larly in forms such as Palaemonetes, in which the ganglia are not fused in one mass.

The pars distalis of the adenohypophysis (and pars tuberalis) lie in front of the pars nervosa, separated from it by the pars intermedia (from Scharrer and Scharrer, 1954«). 114 SECRETORY CELLS FROM THE NERVOUS SYSTEM 35 mammals (Fig. 2-10; Scharrer and Scharrer, 1954a). 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).

In the dog, for instance, both substances can be obtained from both supraoptic and paraventricular nuclei, although the proportion of oxytocin to the antidiuretic fraction is always small ; but in the camel, oxytocin 36 SOURCES OF KINETIC AND METABOLIC HORMONES H I Primary capillary net Mi Secondary capillary net ssasaam ^φ Vascu|ar porfa| plexus ^ ^ FIG. 2-11. Pituitary body in diagrammatic sagittal section with its circulation shown by thin arrows : a to d in fish, e to h in amphi­ bians and reptiles.

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Animal Hormones. A Comparative Survey by Penelope M. Jenkin

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