puolikalvoisen

Puolikalvoinen is a Finnish term that translates to "semitendinosus" in English, referring to one of the three muscles of the hamstring group located in the posterior thigh. The hamstring muscles originate at the ischial tuberosity (the sit bone) and insert below the knee. The semitendinosus is situated on the medial (inner) side of the thigh, lying superficial to the semimembranosus muscle and lateral to the gracilis.

This muscle plays a crucial role in extending the hip and flexing the knee. It also assists in medial rotation of the tibia when the knee is flexed. The semitendinosus is a long, slender muscle, characteristic of its name which suggests "half tendon," referring to its relatively long, tendinous portion. It is innervated by the tibial division of the sciatic nerve. Like the other hamstring muscles, the semitendinosus is susceptible to strains and tears, particularly in activities involving sprinting, jumping, or sudden changes in direction. Rehabilitation often focuses on strengthening and stretching exercises.