Lower limb

Common tendon of semitendinosus and the long head of biceps femoris

Tendo communis musculi semitendinosi et capitis longi musculi bicipitis femoris

Origin

Ischial tuberosity (medial facet)

Insertion

Shared proximal attachment point on the ischial tuberosity, from which both muscle bellies (semitendinosus and the long head of biceps femoris) run separately further distally

Function

Forms the shared proximal origin of two hamstring muscles; both extend the hip and flex the knee

Innervation

Tibial part of the sciatic nerve, L5-S2

Movement & chain

Common proximal origin tendon at the ischial tuberosity; transmits hip extension forces during the propulsion phase of running.

Palpation

Palpable proximally at the level of the ischial tuberosity, particularly in a stretched position (hip flexed, knee extended); often tender to pressure in proximal hamstring tendinopathy.

Clinical

This conjoint tendon is a classic site of proximal hamstring tendinopathy and avulsion injuries during explosive sprinting movements.

Segmental innervation

L5–S2 (sciatic nerve)

In clinical practice

Frequent repositioning to prevent trochanteric and heel pressure ulcers; ensure hip dislocation precautions in total hip arthroplasty patients.

Region in the model

Lower limb