Quadriceps femoris muscle

Not to be confused with quadratus femoris.
Quadriceps femoris muscle

Quadriceps femoris, with different muscles in different colors.
rectus femoris - blue
vastus lateralis - yellow
vastus intermedius - green
vastus medialis - red
Origin Combined rectus femoris and vastus muscles
Insertion Tibial tuberosity
Artery Femoral artery
Nerve Femoral nerve
Actions Knee extension; Hip flexion (Rectus femoris only)
Latin Musculus quadriceps femoris
TA A04.7.02.017
FMA 22428

Anatomical terms of muscle

The quadriceps femoris (/ˈkwɒdrsɛps ˈfɛmərs/) (Latin for "four-headed muscle of the femur"), also called simply the quadriceps, quadriceps extensor, or quads, is a large muscle group that includes the four prevailing muscles on the front of the thigh. It is the great extensor muscle of the knee, forming a large fleshy mass which covers the front and sides of the femur.


The quadriceps consists of four separate muscles

It is subdivided into four separate portions or 'heads', which have received distinctive names:

All four parts of the quadriceps muscle ultimately insert into the tuberosity of the tibia. This is via the patella, where the quadriceps tendon becomes the patellar ligament, which then attaches to the tibia.

There is a fifth muscle of the quadriceps complex that is often forgotten and rarely taught called articularis genus.

In addition, recent cadaver studies have confirmed the presence of a sixth muscle, the tensor vastus intermedius.[1] While the muscle has variable presentations, it consistently originates at the proximal femur, runs between the vastus lateralis and vastus intermedius muscles, and inserts distally at the medial aspect of the patellar base.[1] Historically considered a part of the vastus lateralis, the tensor vastus lateralis muscle is innervated by an independent branch of the femoral nerve and its tendinous belly can be separated from the vasti lateralis and intermedius muscles in most cases.[1]


Femoral nerve (L2, L3, L4).


All four quadriceps are powerful extensors of the knee joint. They are crucial in walking, running, jumping and squatting. Because rectus femoris attaches to the ilium, it is also a flexor of the hip. This action is also crucial to walking or running as it swings the leg forward into the ensuing step. The quadriceps, specifically the vastus medialis, play the important role of stabilizing the patella and the knee joint during gait.[2]

Society and culture


In strength training, the quadriceps are trained by several leg exercises. Effective exercises include the squat and leg press. The isolation movement (i.e. targets solely the quadriceps) is the leg extension exercise.

In body building communities, this muscle is colloquially referred to as the "leg triceps".[3]


The proper Latin plural form of the adjective quadriceps would be quadricipites. In modern English usage, quadriceps is used in both singular and plural. The singular form quadricep, produced by back-formation, is frequently used.

Additional images

See also

This article uses anatomical terminology; for an overview, see Anatomical terminology.


  1. 1 2 3 Grob, K; Ackland, T; Kuster, MS; Manestar, M; Filgueira, L (6 January 2016). "A newly discovered muscle: The tensor of the vastus intermedius". Clinical Anatomy. 29 (2): 256–263. doi:10.1002/ca.22680.
  2. Therapeutic Exercises, Carolyn Kisner & Lynn A. Colby, 5th ed. (2002) 692-93.
  3. Monaghan, L. (2002). Vocabularies of motive for illicit steroid use among bodybuilders. Social Science & Medicine (1982), 55(5), 695-708.
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