Bursting activity in tuberoinfundibular neurones during electrical stimulation of the rostral hypothalamus

The firing of tuberoinfundibular neurones antidromically identified as projecting to the median eminence was recorded during electrical stimulation of the preoptic and/or anterior hypothalamic areas (PO/AH) of the rostral hypothalamus. Parameters of stimulation were chosen which are known to cause increased secretion of most adenohypophyseal hormones. Twenty-three of 58 neurones were excited during the periods of stimulation and approximately half of these excited cells fired in a bursting fashion reminiscent of that previously observed in other endocrine neurones.