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- W2025641609 abstract "The comparative study of pars intermedia control clearly indicates that both nerve and blood supplies are essential pathways for the control of MSH release. Most of the blood vessels penetrating the pars intermedia of tetrapods derive from a dense vascular plexus interposed between the neural and intermediate lobes. In many species this plexus intermedius represents the only vascular supply to the pars intermedia. In turn, this plexus is supplied by capillaries draining the neural lobe, and in some species, also by capillaries coming from the median eminence. Therefore, the blood irrigating the pars intermedia comes from two important neurohemal areas. Based on histochemical and ultrastructural characteristics more than one type of nerve fiber has been described in the pars intermedia of most species studied. The application of the zinc iodide-osmium tetroxide impregnation method (ZIO) to the pars intermedia showed that all types of nerve fibers have ZIO-positive material. Several histochemical, pharmacological and experimental studies strongly suggest that certain variations of the ZIO method and the histochemical fluorescence methods for biogenic amines stain the same group of substances. It is, therefore, postulated that all pars intermedia nerve fibers contain a biogenic amine. Consequently, the distinction between “ordinary” and catecholamine-containing fibers in the pars intermedia should be reconsidered. Instead, the different types of fibers of the pars intermedia may be recognized by considering their histochemical, ultrastructural and electrophysiological characteristics, or their different origins. In lower vertebrates the pars intermedia is poorly vascularized and richly innervated. On the contrary, the innervation of the pars intermedia of higher vertebrates is poor or completely absent and blood vessels are more numerous. However, the pars intermedia of most species studied appears to be under hypothalamic inhibitory control, regardless of the pattern of innervation. All the evidence available points to the possibility that the purely nervous mechanism inhibiting MSH release in lower vertebrates has shifted to a neurovascular mechanism in higher vertebrates." @default.
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- W2025641609 date "1972-01-01" @default.
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- W2025641609 title "Comparative aspects of nervous control of pars intermedia" @default.
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