Abstract:
A total of 19 buffalo foetii ranging from 30 mm to 630 mm Crown-Rump (CR) length were subjected to serial histological sections to study the differentiation of the pars distalis adenohypophysis. The primitive pars distalis tissue appeared at 32 mm stage from the rostro-ventral wall of the Rathke's pouch as irregular projections of the proliferating cells outgrowing into the surrounding mesenchyme. The capillaries were seen entrapped within the adenohypophyseal tissue by 60 mm CR length. The relative proportions of the stromal tissue continued to decrease with age. The parenchymatous cells were predominantly arranged in form of thin cords; and follicular forms were relatively more frequent at 75 mm stage onwards. By 630 mm stage the parenchymatous tissue was arranged primarily in irregular cords and groups of cells with rare follicles.
