Labels:text | screenshot | black and white | black | document OCR: At least four neuronal tracts arise from he main supraoptic and paraventricular nuclei tary to pathway terminates in the posterior p ilation. release its peptides into the systemic c in the Both vasopressin and oxytocin are fou ad the zona externa of the median eminence n the majority of fibres to this region arise f paraventricular nucleus. From the me the eminence, the peptides are secreted in A third hypothalamusry portal circulatic icle. It is tract passes to the floor of the third ve ormones still unknown, however, if the peptid are actively secreted via this tract into pathway imity to cerebro-spinal fluid. The final neuron terminates in the brainstem in close p ss down the vasomotor centre, and a few fibres the spinal cord.
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