325
CHAPTER NINE
Muscular System
groups—those that fl ex the knee and those that extend it.
The muscles of these groups are shown in F gures 9.37, 9.38,
9.39, 9.40, in reference plates 71 and 72, and are listed in
table 9.13
. Muscles that move the leg include the following:
Flexors
Extensor
Biceps femoris
Quadriceps femoris group
Semitendinosus
Semimembranosus
Sartorius
the ischium to the femur. It adducts the thigh and portions
assist in fl
exing and extending the thigh (see F
g. 9.37).
The
gracilis
(gras
il-is) is a long, straplike muscle that
passes from the pubic bone to the tibia. It adducts the thigh
and fl exes the leg at the knee (see F
g. 9.37).
Muscles That Move the Leg
The muscles that move the leg connect the tibia or F
bula to
the femur or to the pelvic girdle. They fall into two major
Gluteus medius
Gluteus medius
Gluteus maximus
Gluteus maximus
Biceps femoris
Iliotibial tract (band)
Vastus lateralis
Rectus femoris
Sartorius
Tensor fasciae latae
Gluteus minimus
Piriformis
(a)
(b)
(c)
(d)
FIGURE 9.38
Muscles of the thigh and leg. (
a
) Muscles of the lateral right thigh. (
b–d
) Isolated views of the gluteal muscles.
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