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Representation of instillation of methylene blue in alive male rat with its abdomen open (methylene-blue was used in this figure for demonstrative purposes). A, B) Angiocatheter insertion at a right angle. C, D) Angulation of the penis, maintenance of the angiocatheter parallel to the medulla spinalis, and advancement of the catheter through the posterior urethra. E) Methylene blue instillation shows the correct positioning of the angiocatheter. F) Methylene blue filled the bladder.
