Adductor Magnus Muscle [portable]
—the second largest muscle in the human body after the gluteus maximus. What is the Adductor Magnus?
The adductor magnus is a unique, "hybrid" muscle located in the medial compartment of your thigh. While it is technically part of the adductor group (the muscles that pull your legs together), its anatomy and function are far more complex. Anatomical Breakdown
It is so large and diverse that it is often divided into two distinct functional parts: The Adductor Portion: adductor magnus muscle
This part originates from the pubic bone and inserts along the length of your femur. It is primarily responsible for pulling your leg toward your midline. The "Hamstring" Portion:
Originating from the "sit bone" (ischial tuberosity), this part functions almost exactly like a hamstring muscle. It is even innervated by the sciatic nerve, just like your true hamstrings. Why It Matters: More Than Just Adduction —the second largest muscle in the human body
While its name suggests its only job is "adducting" (moving the leg inward), recent research suggests its primary design may actually be for hip extension
—the movement of pushing your leg back or standing up from a squat. 1. The King of the Squat Adduction: Lying on your side, lift the bottom
In a deep squat, your glutes and hamstrings are at a mechanical disadvantage. This is where the adductor magnus shines. It becomes the primary muscle to initiate hip extension from the bottom of a squat. If you’ve ever felt "inner thigh" soreness after a heavy leg day, you’ve met your adductor magnus. Adductor Magnus - Physiopedia
1. Hip Adduction (The Obvious Role)
As its name implies, the adductor magnus powerfully adducts the thigh, meaning it pulls the leg toward the midline of the body. This is crucial in sports like soccer (kicking across the body), swimming (flutter kick), and horseback riding (gripping the horse).
Strength Testing
- Adduction: Lying on your side, lift the bottom leg off the table. The therapist applies downward pressure on the top leg while you resist.
- Extension (hamstring portion): Prone with knee flexed to 90°. Extend the hip against resistance. Compare to pure hamstring testing (knee extended).
Stretching the Adductor Magnus
- Standing wide straddle stretch (leans to one side to shift stretch to the posteromedial thigh)
- Sitting sole-to-sole stretch (lean forward with knees dropped toward the floor)
- Supine figure-four stretch (pulling the knee across the body)