Studies on the mammary glands of lactating rats bearing hypothalamic lesions.

It has recently been shown, in experiments on lactating rats with hypothalamic lesions, that milk can be expressed from the mammary glands of rearing-failed, lesioned rats by weak palpation even 10 days after the operation when vigorous suckling by young continued, and that a considerable amount of milk is obtained from mammary glands of these lesioned rats by the regular administration of oxytocin for 3-12 days(Yokoyama and Ota, 1959a, b). The present report deals with a histological observations of the mammary