RESUMO
Background: Comparative histology not only provides information regarding tissues of different mammals but also gives insight to understand human features in the background of informations on tissue of lower mammals. Methods: Splenic tissues from five mammals i.e., human, buffalo, goat, rabbit and rat were processed for histomorphometric study on capsule, trabeculae, lymphoid follicle and central arteriole. Result: Buffalo was one mammal having highest values for all the parameters while rat having lowest. Values in human splenic tissues are in between aforementioned maximum and minimum readings. Conclusion: Teaching materials are available in histology labs from lower mammals in medical colleges might give an insight for understanding human tissues if literature on comparative histology is made available.
RESUMO
Background: Density of bone is directly affected by mineralization, which makes visualization by ultrasonography possible to follow foetal growth from early gestation to term. Clavicle being the first bone to ossify and the only bone to transmit upper limb weight to the axial skeleton, receives special attention by the scientists. Methods: Forty-nine foetal clavicles were divided into five groups. Statistically densities of the clavicles were measured and values between groups were compared. Results: Density was constant in all the groups and both in males and females. Conclusion: It was concluded that matrix formation in clavicles keeps pace with their mineralization during 2nd and 3rd trimesters.