By Penelope M. Jenkin
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Extra info for Animal Hormones. A Comparative Survey
In this way, secretions from the latter can pass into the portal circulation and so to the pars distalis. How much they do so, and whether they affect the rates of hormone secretion from the adenohypophysis, is still a matter for discussion. The vasomotor fibres of the sympathetic nerves follow the course of the hypophysial arteries (Fig. 2-12); they can therefore 42 SOURCES OF KINETIC AND METABOLIC HORMONES FIG. 2-12. Diagrammatic sagittal section of the pituitary gland and hypothalamus of a rabbit, Oryctolagus> with the circulation super imposed and simplified.
Dorsolateral thickenings on II and III (and also on IV and V in other animals) form the THYMUS GLAND (Thym). compact and encapsuled. It receives a rich blood supply from the carotids, and its nerve supply is mainly vasomotor. In most vertebrates the histological character of the gland is fairly constant.
Unilateral section of the axons from the median neurosecretory cells results (a) Corpus cardiacum (b) Corpus allatum FIG. 2-9. Sections of parts of (a) the CORPUS CARDIACUM of a beetle, Hydrous piceus (after de Lerma, 1956), and (b) the CORPUS ALLATUM of a grasshopper, Melanoplus differentialis (after Mendes, 1948). ax), like Herring bodies, and release masses of neurosecretion (ns) in the corpus cardiacum. Cells in different phases of secretion (sc and sc') release masses of granules (mg) that stain with phloxin, and may be the intrinsic secretion of the organ.