24/04/2024
Muscle: Quadricep Femoris
The quadriceps femoris is a powerful muscle in the hindquarters. The quadriceps femoris muscle, inserting to the patella, serves to extend the stifle joint. It may assist in keeping the patella in locked position. The direction of pull of its three main portions, the vastus medialis, re**us femoris and vastus lateralis.
Function:
All four of the quadricep femoris muscles have a similar function. They protract the hindlimb (bring it forward) by extending the stifle (knee) joint. Let's take a closer look at each quadricep muscle.
Three of the quadricep muscles are very similar. The Vastus Medialis is the most medial (inside) of the vastus muscles. The vastus lateralis is the middle quadricep and is the most lateral (outside). All three of these muscles extend and stabilize the stifle joint.
The Re**us Femoris is a little different. This muscle originates on the illum (pelvis), meaning that in addition to extending and stabilizing the stifle, it can also flex the hip joint.
All of the quadriceps femoris muscles have different origins, but merge together into a single insertion point just above the intermediate patellar ligament.