At the top you see a sketch of a sweet man. That's probably the man who got dissected.
A showdown of the two greatest rivals of the Renaissance.
If you pay real attention you can see where the strokes begin, you see a little point, and then the stroke lifts as he takes the hand off the paper.
You can really see Leonardo thinking on the paper. You can see how he first uses black chalk, and then how he changes his ideas about a particular solution, and then he will go onto another thought always on the same page.