| Title: | THE FUNCTIONAL ANATOMY OF
THE UFtETEROVESICAL JUNCTION AND ITS
RELATIONSHIP TO THE TRIGONE OF URINARY
BLADDER : A COMPARATIVE STUDY IN
HUMAN, COW AND SHEEP |
| Full paper | Not Available |
| Abstract: |
Abstract The ureterovesical junction commonly described as a one-way valve. allowing the passage of urine from the ureter to the bladder, thus it prevents the reflux. So the structure of the ureterovesical junction is very important to understand this function. This work is aimed to study the comparative anatomy of the ureterovesical _junction in human, cow and sheep. The present study was done on five postmortem human, four cows and six sheeps using a bloc of urinary bladders, pelvic ureters and proximal urethra The cross sections of the ju.vtavesical part of ureter, the longitudinal sections of the intravesical part of ureter and transverse sections of trigone at and below the levels of ureteric orifices were prepared for routine histology using haemataxylin and eosin and Masson s Trichrome stains. The present study showed that the fiatavesical part of ureter in human, cow and sheep in cross sections are nearly similar in structure. The muscle coat is formed of mixture of longitudinal and circular smooth muscle fibers. The lamina propria is formed of extensive collagenous fibers. However. in human, the mucous membrane is thrown into many longitudinal folds than in cow and sheep. The muscle coat of intramural part of ureter in human, cow and sheep is arranged longitudinally with disappearance of circular smooth muscle fibers. However, the muscle coat appears thicker in human than the cow and sheep. The intramural part of ureter was separated from the detrusor muscle by a well formed periureteric sheath in human and loose connective tissue in cow and sheep. The submucosal pan of ureter in human, cow and sheep in |