histological study of nephrons in the kidney of caspian pony

to determine microscopic structures of nephrons in caspian pony, a total number of five adult and healthy miniature ponies were provided and after opening the abdominal area, the kidneys were removed. the specimens, after fixation in 10% formalin and tissue passages were stained by hematoxylin and eosin and studied under light microscope. kidneys are covered by a dense connective tissue. each kidney is composed of two distinct parts of cortex and medulla which in cortex, renal corpuscles associated with some parts of urinary tubules are located. in medullar part of the kidneys, thin and thick limbs of henle and medullar part of collecting tubules, are observed, which terminate to papillary or bellini ducts. kidneys in caspian pony are very similar to those of other equine. although morphologically there are some differences between this species and others, but the presence of the capsule and its connections might be a peculiarity in this species.