The author reflects on the researches related to the anterior cruciate ligament (ACL) anatomy. Topic discussed include Ivar Palmer's efforts in describing bundles of the ACL in order to perform an ACL reconstruction using a "double- bundle" technique, description of the flat midsubstance and flat femoral ACL insertion by T. Mochizuki and others and Robert Smigielski statement of ACL being a ribbon to the ACL specialists at the ACL study group meeting 2012.