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The Muscular System Part D

Most anterior compartment muscles of the hip and thigh flex the

femur at the hip and extend the leg at the knee

Posterior compartment muscles of the hip and thigh extend the

thigh and flex the leg

The medial compartment muscles all

adduct the thigh

These three groups are enclosed by

the fascia lata

The ball-and-socket hip joint permits

flexion, extension, abduction, adduction, circumduction, and rotation

The most important thigh flexors are

the tensor fasciae latae and rectus femoris

The medially located adductor muscles and sartorius assist

in thigh flexion

Thigh extension is primarily effected by the

hamstring muscles (biceps femoris, semitendinosus, and semimembranosus)

Forceful extension is aided by

the gluteus maximus

Abduction and rotation are effected by the

gluteus medius and gluteus minimus

Thigh adduction is the role of five adductor muscles

(adductor magnus, adductor longus, and adductor brevis; the pectineus, and the gracilis)

The sole extensor of the knee is

the quadriceps femoris

The hamstring muscles flex the

knee, and are antagonists to the quadriceps femoris

Muscles of the Anterior Compartment are the primary

toe extensors and ankle dorsiflexors

Muscles of the Anterior Compartment include

the tibialis anterior and extensor digitorum longus

Muscles of the Lateral Compartment plantar flex and evert

the foot

Muscles of the Lateral Compartment include

the fibularis longus and fibularis brevis muscles

Muscles of the Posterior Compartment primary flex

the foot and the toes

Muscles of the Posterior Compartment include

the gastrocnemius, soleus, tibialis posterior, flexor digitorum longus

Thigh muscles:

-Flex and extend the thigh (posterior compartment)
-Extend the leg (anterior compartment)
-Adduct the thigh (medial compartment)

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