The vastii and articularis genus provide knee extension.
2.
The anterior compartment of thigh contains the sartorius muscle and the four quadriceps : the rectus femoris, vastus lateralis, vastus intermedius and vastus medialis, along with the articularis genus.
3.
From the upper three-fourths of this surface the Vastus intermedius arises; the lower fourth is separated from the muscle by the intervention of the synovial membrane of the knee-joint and a bursa; from the upper part of it the Articularis genus takes origin.
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