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Persistent embryonic veins in the arteriovenous malformation of the diencephalon.

The diencephalic arteriovenous malformation is produced by the posterior cerebral, posterior choroidal, and anterior choroidal arteries. The abnormal arterialised vessels seen in these malformation represent dorsal and ventral diencephalic veins. The drainage of the shunted blood is primarily into the transverse sinus. This is later diverted medially into the great cerebral vein, with the formation of the basal vein. The medial drainage, in keeping with the normal developmental pattern, is seen frequently. The presence and locations of angiomas are very variable and do not follow any predictable pattern.

Diencephalon↗

Distribution of somatostatin in the rat brain: telencephalon and diencephalon.

The distribution of somatostatin (SRIF) was examined using the unlabeled antibody enzyme method of immunocytochemistry on thick 30-50 microns Vibratome sections. The greatest population of SRIF-neurons was observed along the ventricular wall in the preoptic area and anterior hypothalamus. Dense accumulations of fibers were observed in the suprachiasmatic, ventromedial and arcuate nuclei, the internal and external zone of the median eminence, the organum vasculosum of the lamina terminalis and the subfornical organ. Extrahypothalamic sites of SRIF-containing neurons and fibers were also observed throughout the telencephalon. The widespread distribution of SRIF is consistent with radioimmunoassay data and suggests a diverse physiological role for somatostatin.

Animals↗