ACTION: Flexes the knee
REFERRAL: Posterior knee

COMMENTS: The popliteus is deep to the gastrocnemius, and helps to unlock the knee from a hyper extended state. Both these muscles refer into the posterior knee and should be addressed along with the biceps femoris. When you are working on the heads of the gastrocnemius, be wary of the large artery, nerve and vein moving through the popliteal space (back of the knee).