Gross changes produced by traction force in the long bone of rabbit tibia

Effects of traction on long bone growth in 30 rabbits were studied by applying traction in long axis of right tibia. Animals were divided into three equal groups, experimental, sham operated and control group. Radiography was used for measurement of initial and final length of tibia. Traction was applied in experimental group of animals only. The experimental tibia did not show significant change in its length as compared to opposite tibia

Age related changes in the rat adrenal cortex

The present study revealed that the growth of the rat adrenal gland was relatively slower than general body growth. However, growth of the cortex preceded that of the medulla. The parenchyma showed three usual zones but a fourth inconstant lipid-poor, zona intermedia between outer glomerulosa and middle fasciculata was also observed. In all cortical zones, the predominance of dark cells over the light cells occurred irrespective of the age groups studied. The advancing age replaced capsular cellular elements with fibrous ones whereas the mitotic activity of the parenchymal cells decreased and an increase in the intracellular lipid in the outer and ascorbic acid in the inner cortex was observed. The glycogen which was restricted mainly to the inner cortex remained unaffected by aging process while the acid phosphatase activity from the inner reticularis extended to the outer cortex in aged group