The vastus lateralis muscle does the following:
Extends the leg at the knee.This means that the vastus lateralis muscle straightens the leg at the knee joint such that there is an increase in the angle between the lower leg and the upper leg.
Vastus Lateralis
Originating from the femur, the vastus lateralis extends down the lateral side (outer area) of the thigh and inserts into the patella.
Vastus Medialis ...
Vastus Lateralis - Large ("vast") lateral muscle on the thigh.
Vastus Medialix - Large ("vast") middle ("medial") muscle on the thigh.
Rectus Femoris
Vastus Lateralis (Externus)
Vastus Intermedius
Vastus Medialis (Internus)
Movement ...
Staying with the quadriceps, it is possible to fully exhaust the Vastus Lateralis while preserving some of the strength of the Rectus Femoris, when performing leg presses.
Vastus lateralis - Extends knee
Vastus medialis - Extends knee
Vastus intermedius - Extends knee
Sartorius - Flexes knee. Flexes hip and rotates femur laterally
Biceps femoris - Flexes leg and extends thigh ...
quads, quadriceps the large muscle of the front of the thigh, composed of four heads: the vastus lateralis, vastus intermedius, vastus medialis, and rectus femoris.
The Quadriceps consist of rectus femoris, vastus medialis, vastus intermedius and vastus lateralis. These are the powerful extensors of the knee and are involved in running, lifting and even standing still.
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**** = Measured as the Phenylalanine disappearance rate - considered an indicator of muscle protein synthesis - via femoral arteriovenous catheterization, as well as muscle biopsies from the vastus lateralis were used to determine phenylalanine ...
 See also: Lateral, Vastus medialis, Medial, Lower, Exercise
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