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The
quadriceps are the upper leg muscles at the front of the thigh which act as
extensors of the leg. The four muscles involved are the rectus femoris,
the vastus intermedius (these two muscles making up the central V-shape
delineation of the middle front thigh), the vastus medialis of the inner
thigh, and the vastus lateralis of the outer thigh.
Quadriceps
basic function : To extend and straighten the leg
The biceps
femoris and associated muscles - the thigh flexors at the rear of
the leg
Biceps
femoris function : To curl the leg back
Other
important muscles of the upper leg include the tensor fasciae latae,
coming down from the hip to the outer thigh; and the sartorius, the
longest muscle in the body, which weaves diagonally across the front of
the thigh.
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