1.
The adductor group moves the thigh medially and
includes
the
adductor
magnus,
adductor
longus,
pectineus, and gracilis.
2.
The quadriceps group extends the leg and includes the
vastus lateralis, vastus medialis, vastus intermedius,
and rectus femoris.
3.
The hamstring group flexes the leg and includes the
biceps femoris, semitendinosus, and semimembranosus.
4.
The sartorius helps you cross your legs by weakly flexing
the leg and the knee joint and flexing, abducting, and
laterally rotating the thigh at the hip joint.
5.
The tensor fasciae latae moves the thigh laterally.
Muscle
Origin
Insertion
Action
Muscles of the gluteal region
Gluteus maximus
(GLOO-te-us MAK-si-mus)
Ilium, sacrum,
coccyx, and
aponeurosis of
sacrospinalis
Iliotibial tract of fascia lata and
femur
Extends and rotates thigh laterally at the hip joint;
helps lock knee in extension
Gluteus medius
(ME-de-us)
Ilium
Femur
Abducts and rotates thigh medially at the hip joint
Piriformis
(pir-i-FOR-mis)
Sacrum
Femur
Rotates thigh laterally and abducts it at the hip joint
Muscles of the thigh
Adductor group
Adductor magnus
(MAG-nus)
Pubis and ischium
Femur
Adducts, rotates, flexes, and extends thigh at hip
joint
Adductor longus
(LONG-us)
Pubis and pubic
symphysis
Femur
Adducts, rotates, and flexes thigh at hip joint
Pectineus
(pek-TIN-e-us)
Pubis
Femur
Flexes and adducts thigh at hip joint
Gracilis
(gras-I-lis)
Pubis
Tibia
Adducts and medially rotates thigh at hip joint,
flexes leg at knee joint
Quadriceps group
Vastus lateralis
(VAS-tus lat'-er-A-lis)
Femur
Patella by means of quadriceps
tendon and then tibial tuberosity
by means of patellar ligament
Extend leg at knee joint
Vastus medialis
(me-de-A-lis)
Femur
Patella by means of quadriceps
tendon and then tibial tuberosity
by means of patellar ligament
Extend leg at knee joint
Vastus intermedius
(in'-ter-ME-de-us)
Femur
Patella by means of quadriceps
tendon and then tibial tuberosity
by means of patellar ligament
Extend leg at knee joint
Rectus femoris
(REK-tus FEM-or-is)
Ilium
Patella by means of quadriceps
tendon and then tibial tuberosity
by means of patellar ligament
Extend leg at knee joint; flex thigh at hip joint
Hamstrings
Biceps femoris
(Bl-ceps FEM-or-is)
Ischium and femur
Fibula and tibia
Flexes leg at knee joint; extends thigh at hip joint
Semitendinosus
(sem'-e-TEN-di-no'-sus)
Ischium
Tibia
Flexes leg at knee joint; extends thigh at hip joint
Semimembranosus
(sem'-e-MEM-bra-no'-sus)
Ischium
Tibia
Flexes leg at knee joint; extends thigh at hip joint
Sartorius
(sar-TOR-e-yus)
Ilium
Tibia
Weakly flexes leg at knee joint; flexes, abducts, and
laterally rotates thigh at hip joint, thus crossing leg
Tensor fasciae latae
(TEN-sor FA-she-e LA-te)
Ilium
Tibia by means of iliotibial tract
Flexes and abducts thigh at hip joint; helps lock
knee in extension
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