Gilles de Corbeil's medical poem De urinis was based on writings by Theophilus Protospatharius by way of the Articella. Poems such as this were intended as mnemonic aids for students, and they tended to be widely used.
"Gentile's commentary de urinarum iudiciis makes a first attempt to comprehend the physiology of urine formation; aided by his dissection of cadavers, Gentile asserted that urine associated with the blood passes per poros euritides ("through the porous tubules") of the kidney and is then delivered to the bladder. Commenting on De pulsibus, he connected the relationship between fast pulse rate and urine output and correlated the color of urine with the condition of the heart. For the originality of his thought Mario Timio suggested that Gentile could be indicated as the 'first' cardionephrologist in the history of medicine." (Wikipedia article on Gentile da Foligno, accessed 1-2017). ISTC No. ia00093000. Digital facsimile from the Countway Library at Harvard at this link.
See also Carmina de urinarum iudiciis edited ab excellentissimo magistro Egidio cum expositione et commento magistri Gentils de Fulgineo noviter castigatis, Et pluribus in locis emendatis, per magistrum Auenantium, de Camerino artium & medicinae professorem (Basel, 1529) Digital facsimile of the 1529 edition from Google Books at this link.