By Dr. med. habil. László Záborszky (auth.)
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Additional info for Afferent Connections of the Medial Basal Hypothalamus
From here the 31 fibers enter the MFB. As revealed by the biochemical measurements following various surgical transections, the ventral bundle contains most of the noradrenergic fibers to the NA and ME. Ventral Periventricular System. Caudally this system can be seen dorsolaterally to the interpeduncular nucleus. Fibers run ventrally from the supramamillary commissure to rostral and enter the dorsomedial hypothalamic and paraventricular nuclei through the posterior hypothalamic area. They form a broad ascending fiber system at the lateral aspect of the periventricular nucleus.
As pointed out in Sect. 5, a decrease of amine may be due to a number of factors. Furthermore, it has to be taken into consideration that biochemical measurements were made 7-10 days after the lesion (the survival time when the noradrenergic degeneration process ceases); electron microscopy, on the other hand, was employed at an early stage, 2-4 days postoperatively. Because of the asynchrony of the degeneration process and the strict criteria established, the number of degenerated terminals was underestimated.
At the same time this mode of innervation also ensures a great deal of divergence because any single brain stem cell group projects to a number of places. Of the verified connections, only a few were identified chemically. In some cases, the joint occurrence of a biogenic amine and a neuropeptide was demonstrated (Hokfelt et al. 1978b); thus it seems possible that an identified pathway operates with more than one transmitter. There is possibility of an interaction between tracts of different transmitters if they terminate at the same sites, such as the neuropeptidecatecholamine interaction in the ME (Ajika 1980).