Quadriceps muscle 🦵🏻 | Origin, insertion and action

The quadriceps femoris is a hip flexor and a knee extensor. It consists of four individual muscles; three vastus muscles and the rectus femoris. They form the main bulk of the thigh, and collectively are one of the most powerful muscles in the body
Vastus Lateralis
Proximal attachment: Originates from the greater trochanter and the lateral lip of linea Aspera.
Actions: Extends the knee joint and stabilises the patella.
Vastus Intermedius
Proximal attachment: Anterior and lateral surfaces of the femoral shaft.
Actions: Extends the knee joint and stabilises the patella.
Vastus Medialis
Proximal attachment: The intertrochanteric line and medial lip of the linea aspera.
Actions: Extends the knee joint and stabilises the patella , particularly due to its horizontal fibres at the distal end.
Rectus Femoris
Attachments: Originates from the ilium, just superior to the acetabulum. It runs straight down the leg (the Latin for straight is rectus), and attaches to the patella by the quadriceps femoris tendon.
Actions: The only muscle of the quadriceps to cross both the hip and knee joints. It flexes the thigh at the hip joint, and extends at the knee joint.
The quadriceps all work to extend (straighten) the knee. The rectus femoris also flexes the hip, The vastus medialis adducts the thigh and also extends and externally rotates the thigh and stabilizes the kneecap
The quadriceps are primarily active in kicking, jumping, cycling and running. eg sports like basketball that requires jumps.
In everyday life, they help you get up from a chair, walk, climb stairs and squat.
They are used in walking and running at the onset of a stride and get used significantly when going downhill.
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