| Abstract: | By Falck's method monoaminocytes of the arteries in the encephalon base were studied in Teleostei (Anarhichas lupus, Eleginus navaga, Leuciscus brandti Liza soiuy in amphibians (Rana temporaria, Rana semiplicata, Bufo bufo), in reptiles (Testudo horsfiedli, Trionyx chinensis) and in birds (blue rock pigeon, hen). Specific and individual peculiarities in chromaffinocyte, labrocyte and melanophore distribution were revealed in the vertebrate cranial arteries. In all the animals studied chromaffin cells are more frequent in the lateral olfactory artery. Their concentration decreases towards cranial, caudal branches of the internal carotid artery, the main and internal carotid arteries. The greatest amount of chromaffinocytes was found in the cranial arteries of Anarhichas lupus, then comes Eleginus navaga, Leuciscus brandti and Liza soiny Concentration of melanophores in fishes increases with enlargement of the vascular diameter; these cells are more abundant in the arteries of Anarhichas lupus and in less amount in Eleginus navaga, Leuciscus brandti and Liza. Pigmented cells are more abundant in the internal carotid artery and its cranial and caudal branches than in lateral, olfactory and main arteries of fishes. On the contrary, in amphibians, the main artery contains a maximal concentration of melanophores. In the tortoise cranial arteries, there are only single cells of this type, and birds have no such cells. Labrocytes occur in the greatest concentration in the tortoise cranial arteries and in other vertebrates they are scarce or absent. As a whole, the role of the local endocrine link in regulation of the brain arteries mobility decreases in the following way: fishes--amphibians--reptiles--birds. |
