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Hammerhead sharks (genus Sphyrna) show two large arterial coilings in a posteroventral hollow of the orbitary cavity. The posterior is made up of the hyoid artery which, after giving rise to the stapedial artery, enters the chondrocranium to originate the internal carotid and the cerebral arteries. The efferent pseudobranchial artery forms the anterior coiling, gives rise to the ophthalmic artery,...
Salmon calcitonin was administered intraperitoneally (0.1, 10, 1000 ng/100 g of fish) to freshwater-adapted, immature, female brown trout, Salmo trutta, and changes in serum calcium levels were determined. The lowest dose (0.1 ng) had an effect similar to injection of saline (control), but the higher doses produced hypercalcemia. These latter effects were associated with increased serum levels of...
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