The muscle indicated is the adductor longus muscle of the thigh.
The adductor longus is one of six muscles in the medial compartment of the thigh. The thigh consists of three muscular compartments:
The medial compartments consists of the following muscles:
- Adductor longus
- Adductor brevis
- Adductor magnus
- Obturator externus
All the muscles of the medial compartment are innervated by the obturator nerve except for the pectineus (femoral nerve) and the hamstring part of the adductor magnus (tibial division of sciatic). The muscles of the medial compartment generally serve to adduct the thigh at the hip joint.
The adductor longus can additionally medially rotate the femur. There are three “adductor” named muscles: adductor brevis, adductor longus and adductor magnus. The adductor brevis and longus lie superficial to the adductor magnus. The adductor brevis is located superiorly and the adductor longus is located inferiorly.
Origin: anterior body of pubis
Insertion: middle third of linea aspera
Action: adduction, medial rotation and flexion of thigh at hip joint.
Innervation: obturator nerve
Learn more about the anatomy of the thigh muscles in this anatomy tutorial.