Medical Definition of dorsiflexion. : flexion in a dorsal direction; especially : flexion of the foot in an upward directionâcompare plantar flexion.
Willis Tower. The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,450-foot (442.1 m) skyscraper in Chicago, Illinois, United States.
The Circle of Willis is a ring or circle of arteries located at the base of the brain. The arteries in the Circle of Willis may be enough to preserve blood flow to the brain even if one artery is constricted or blocked.he Circle of Willis is a ring or circle of arteries located at the base of the brain. The arteries in the Circle of Willis may be enough to preserve blood flow to the brain even if one artery is constricted or blocked.