A large triangular muscle, situated on the medial side of the thigh, which aids in bring the leg toward the body. It consists of two parts. The portion which arises from the ischiopubic ramus (a small part of the inferior ramus of the pubis, and the inferior ramus of the ischium) is called the pubofemoral portion, adductor portion, or adductor minimus, and the portion arising from the tuberosity of the ischium is called the ischiocondylar portion, extensor portion, or "hamstring portion". 

Due to its common embryonic origin, innervation, and action, the ischiocondylar portion (or hamstring portion) is often considered part of the hamstring group of muscles. It is a composite muscle as the adductor and hamstring portions of the muscle are innervated by two different nerves. The adductor portion is innervated by the posterior division of the obturator nerve while the hamstring portion is innervated by the sciatic nerve.