Long head of biceps femoris
Muscles · Latin: Caput longum musculi bicipitis femoris
BICEPS FEMORIS MUSCLE
The biceps femoris is a muscle of the thigh located to the posterior, or back.
As its name implies, it has two parts, one of which (the long head) forms part of the hamstrings muscle group.
Definition from Wikipedia, CC BY-SA 4.0.