NCIt definition : The portion of the quadriceps femoris muscle group that is underneath the Rectus Femoris
muscle, spans and covers the upper two-thirds of the anterior and lateral surfaces
of the femur, and inserts into the lateral border of the patella.;
Alternative definition : CDISC: A muscle in the quadriceps femoris muscle group between the vastus lateralis
and vastus medialis deep to the rectus femoris; primary function is the extension
of the femorotibial joint.;