In Arabic alone, more than thirty commentaries and super-commentaries on the Canon survive in over a hundred manuscripts. No other text except the Qurʾān received so much scholarly attention. Most of this exegetical tradition has never been studied, read, or translated, so we are in no position to produce generalising statements about it. Yet, the few commentaries that have been studied proved to contain some very interesting material. The most famous case is that of Ibn al-Nafīs (d. 1288), who wrote a commentary on the first book of the Canon (the ‘Generalities’), as well as on the ‘anatomy (tashrīḥ)’; in the latter, he argued for the so-called ‘pulmonary transit’, understanding that blood moves from the right to the left ventricle of the brain via the lungs (for further information, see the article by Nahyan Fancy below)...
Left: The central text consists of the anatomical sections of the Canon of Medicine by Ibn Sīnā (Avicenna). In the margins are lengthy quotations from the commentary on the anatomy of the Canon that was written by Ibn al-Nafīs (d. 1288).