Diagram of the visual system. Ibn al-Haytham (circa published in The oldest known drawing of the nervous system shows a large nose at the bottom, eyes on either side, and a hollow optic nerve that flows out of each one towards the back of the brain.
Human body showing arteries and viscera from a manuscript attr. to Shikastah-Nastaliqca, XIIX. This anatomical drawing is thought to be a copy of an illustration from the Tashrih bi al-Taswir / Illustrated Anatomy by a late XIV physician Mansur ibn Ilyas.