Vastus medialis

The vastus medialis (Latin: musculus vastus medialis) is one of four muscles that compose one of the strongest muscle in the human body - the quadriceps femoris muscle. It is located on the medial side in the anterior compartment of the thigh, and therefore, it belongs to the thigh muscle group. The vastus medialis originates from several anatomical landmarks of the femur, descends and via a tendon common with all quadriceps femoris muscles inserts on the tibial tuberosity of the tibia.

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Vastus medialis
OriginLower part of intertrochanteric line, spiral line, medial lip of linea aspera, superior aspect of medial supracondylar ridge
Insertion Tibial tuberosity via patellar ligament, medial aspect of patella
Action Leg extension
InnervationFemoral nerve (L2 - L4)
Blood supply Femoral, deep femoral and superior medial genicular arteries

Origin

The vastus medialis originates from the lower aspect of the intertrochanteric line and the spiral line of the femur, as well as from the medial lip of the linea aspera and superior aspect of the medial supracondylar ridge of the femur.

Vastus medialis, Quadriceps femoris, Anterior view of vastus medialis, Lateral view of vastus medialis, Medial view of vastus medialis, Thigh muscles, Anterior compartment of thigh, Anterior compartment muscles, Human thigh
Vastus medialis by Anatomy Next

Insertion

Along with other muscles of the quadriceps femoris, the vastus medialis inserts on the tibial tuberosity via the patellar ligament. Also, it attaches to the medial aspect of the patella.

Action

Like other muscles composing the quadriceps femoris muscle, the vastus medialis extends the leg at the knee joint.

Innervation

The vastus medialis is innervated by the muscular branches of the femoral nerve (L2 - L4) that arises from the lumbar plexus.

Blood supply

The vastus medialis receives arterial blood supply from the femoral, deep femoral and superior medial genicular arteries. The femoral artery is a continuation of the external iliac artery, the deep femoral artery arises from the femoral, while the superior medial genicular artery is a branch of the popliteal artery.