Abstract
Histochemical distributions of monoamine oxidase (MAO) and acetylcholinesterase (AChE) were studied in the hypothalamo-hypophysial system of the lamprey. The anterior part of the neurohypophysis which lies parallel to the pars distalis was strongly MAO positive. The posterior part of the neurohypophysis which is contiguous to the pars intermedia showed relatively weak activity of MAO. Considering differences in enzyme concentrations together with other anatomical characteristics, the possibility that the anterior neurohyp physis of the lamprey could be comparable to the tetrapod median eminence and the posterior neurohypophysis comparable to the pars nervosa is discussed. The activity of AChE was not detected in the hypothalamo-hypophysial neurosecretory system.
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