Abstract
The mammary gland was examined gross anatomically and light microscopically in a female of 25 months later after parturition. The area of the enlarged tissue of the mammary gland was 181.7 cm^2 in left side and 157.2 cm^2 in right side. By light microscopy the tissue of the mammary gland consisted of the alveolus glandulae and the connective tissues The secretary cells and the myoepitherial cells were observed in the alveolus glandulae. Although the clear cytoplasm typical in the lactating females of other species could not be seen in the secretary cells, the secretary products were encountered in the lumen of alveolus. The present findings in the gross anatomy and the histology demonstrate that the mammary gland is active even in the female of 25 months later after parturition, and that such female is in later stages of the lactation period. These data will be effective to discuss the strategy of the reproduction and lactation in some species of the apes including the human
