The morphology and histology of a certain structure connected with the pars intermedia of the pituitary body of the ox

Certain physiological experiments are now being conducted in the Rudolph Spreckels Physiological Laboratory of this University which necessitate the separation of a great number of ox pituitaries into their two main divisions.As an interesting anatomical feature was in this way brought to our attention the material was used in addition for this anatomical study.This feature has not been mentioned by the following who have written more or less fully upon the pituitary body of the ox, Peremeschko ('67), Dostojewski ('86), Herring ('08)' and Trautmann ('11).The pituitary body of the ox, like that of other vertebrates, is composed of two distinct portions.One, the pars nervosa, is derived from the brain as an outgrowth of the hypothalamus.The other originates as a hollow buccal evagination which in time is completely separated from the digestive tract.That portion of this evagination which comes into contact with the pars nervosa is called the pars intermedia.It is a comparatively thin sheet of epithelium which spreads as a coating over much Material amounting to thousands of pituitary bodies was most kindly supplied by the Oakland Meat and Packing Company through the courtesy of the Superintendent.As the cone structure was present indifferently in these three varieties, its appearance can have little t o do with sex or castration. 403It was derived from cows, bulls and steers.