The muscle group that is at the front of the thigh; It has four parts: the rectus femoris muscle which is in the centre; the vastus lateralis muscle which on the outer side of the thigh (lateral side); the vastus medialis muscle which is on the inner part of the thigh (medial side) and the vastus intermedius muscle which is on the front but under the rectus femoris.
Synonyms: Extensor muscles, quads
Symptoms: Pain, tenderness, inflammation, limited movement
Conditions: Strain, tendonitis , tear