(Hamstrings) Semitendinosus

hamstring-muscles-origin-labeledMuscle Origin

Ischial tuberosity to medial tibia.

The ischial tuberosity (or tuberosity of the ischium, tuber ischiadicum), also known informally as the sitz bone, or as a pair the sitting bones) is a large swelling posteriorly on the superior ramus of the ischium. It marks the lateral boundary of the pelvic outlet. Wiki


Pes anserinus (tibia).

Upper part of the medial surface of the tibia, behind the attachment of the sartorius and distal and slightly anterior to the attachment of the gracilis.


Flexes lower leg at knee.

The quadriceps femoris (/ˈkwɒdrᵻsɛps ˈfɛmərᵻs/) (Latin for “four-headed muscle of the femur”), also called simply the quadriceps, quadriceps extensor, or quads, is a large muscle group that includes the four prevailing muscles on the front of the thigh. It is the great extensor muscle of the knee, forming a large fleshy mass which covers the front and sides of the femur. Wiki

Innervation – Nerve control

Sciatic nerve.

A lower motor neuron exits to the sacral plexus exiting through the spinal levels L5-S2. From the sacral plexus, the lower motor neuron travels down the sciatic nerve. The sciatic nerve branches into the deep fibular nerve and the tibial nerve. The tibial nerve innervates the semitendinosus as well as the other hamstring muscles, the semimembranosus and biceps femoris. Wiki


Inferior gluteal artery, perforating arteries.

The inferior gluteal artery (sciatic artery), the smaller of the two terminal branches of the anterior trunk of the internal iliac artery, is distributed chiefly to the buttock and back of the thigh. Wiki

Antagonist muscles

Quadriceps muscle.

Iliopsoas, Pectineus, Tensor fasciae latae, Adductor brevis, Sartorius.

Pictures of muscles


Trigger Point Referrals


Stretching description







Additional Resources
Sports Lab
American Academy of Manual Medicine

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