Rembrandt's painting 'The Anatomy Lesson' (1632) is revolutionary in its po
rtrayal of members of the Anatomic Guild. It has an entirely new compositio
n and vividly depicts the dynamics of the event and the interest of the par
ticipants. However, the structures of the dissected forearm have been taken
from a copy and not from the original. The possibility of anatomic errors
is discussed here. A short biography of Dr. Tulp is also included.