Adductor longus muscle
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The adductor longus muscle is a large triangular-shaped muscle located in the medial compartment of the thigh and belongs to the hip adductors muscle group. The muscle forms the floor of the femoral triangle.
action: adducts and medially rotates thigh at hip joint
innervation: obturator nerve (L2 - L4)
The adductor longus muscle is found anterior to the adductor magnus, adductor brevis, anterior branch of the obturator nerve, and deep femoral vessels. It lies lateral to the gracilis and medial to the pectineus. The spermatic cord and fascia lata are situated anterosuperiorly to the adductor longus, while the femoral artery and vein are found in the anteroinferior aspect of the muscle near its attachment.
It inserts onto the middle third of the medial lip of the linea aspera. This insertion point is between the insertion of the adductor magnus and origin of the vastus medialis, and inferior to the insertion of the adductor brevis.
The adductor longus, alongside the adductor group of muscles, aids in thigh adduction, flexion, and external (lateral) rotation at the hip joint. It also supports in stabilizing the pelvis.
The adductor longus muscle forms the medial/inferior border of the femoral triangle. The superior border is formed by the inguinal ligament, while the lateral border is formed by the sartorius. The femoral nerve, artery and vein run through this triangular region (lateral to medial).