Rectus femoris - Anterior inferior iliac spine and anterior superior rim of the acetabulum.
Vastus lateralis - Anterior, inferior border of the greater trochanter and proximal 1/2 of lateral lip of the Linea aspera of the femur.
Vastus intermedius - Anterior and lateral surface of the femur, proximal 2/3 of the femur, and the distal 1/2 of the linea aspera and lateral intermuscular septum.
Vastus medialis – Distal 1/2 of intertrochanteric line, medial linea aspera, proximal medial supracondylar line, tendons of adductor longus & adductor magus and medial intermuscular septum.
Insertion: Proximal border of patella & through patella ligament to tuberosity of tibia.
Action: Extends the knee, Rectus femoris flexes the hip as well as extends the knee.
Position: supine, hip flexed 80°, knee flexed 80°.
Rotation: None required.Stabilise: opposite ASIS.
Monitor: Apply pressure at the leg above the ankle to flex the knee.
Nerve Supply: Femoral - L2, L3, L4.
Parasympathetic: Vagus X
Anterior: Medial 1/2 of the 5th rib space on the left side for both muscles though occasionally right too.
Posterior: 2cm lateral to midline between T6 & T7 on the left.
Neuro-Vascular Reflex: Bilateral frontal eminences.
Yuan point: St42