Категории: Все - muscles

по Sydney Guyotte 6 лет назад

234

Muscle Actions of LE

The muscles of the medial, anterior, and gluteal regions of the thigh perform various functions essential for leg movement and stability. The medial thigh muscles, primarily adductors, include the gracilis, which also flexes and medially rotates the leg, and the obturator externus, which laterally rotates the thigh.

Muscle Actions of LE

Muscles of the Gluteal Region

Extensors of Hip and Flexors of Knee (Hamstrings)

Semimembranosus
Semitendinosus

flexes leg and IR the when knee is flexed

when thigh and leg are flexed, these mm's can extend trunk

Biceps Femoris
flexes leg and externally rotates it when the knee is flexed

extends thigh

ex: accelerating mass during first step of gait

Abductors and Rotators of Thigh

Quadratus Femoris
Superior and Inferior Gamelli

The gamelli mms blend w/ the shared tendon of the obturator internus as it attaches to the greater trochanter of the femur, collectively forming the triceps coxae

Obturator Internus
Piriformis
ER the hip

abduct flexed thigh

Tensor Fascia Latae
Abducts, Flexes and IR the hip
Gluteus Minimus
Gluteus Medius
Abducts and medially rotates thigh

keeps pelvis level when ipsilateral limb is weight-bearing and advance opposite (unsupported) side during its swing phase

Gluteus Maximus
Extends thigh

assists in lateral rotation

Collectively the 5 muscles listed are the adductors of the thigh, but their actions are more complex (they act as flexors of the hip joint during flexion of the knee joint and are active during walking)

Muscle Actions of LE

Muscles of Medial Thigh: Adductors of Thigh

Obturator Exernus
Laterally rotates thigh (ER the hip);

steadies head of femur in acetabulum

Gracilis

flexes leg

helps rotate leg medially

Adductor Magnus

Adductor part: flexes thigh

Hamstring part: extends thigh

Adductor Brevis
Adducts thigh: to some extent flexes it
Adductor Longus
Adducts thigh

Muscles of the Anterior Thigh: Extensors of Knee

Quadriceps Femoris
Vastus Intermedius
Vastus Medialis
Vastus Lateralis

Extends the knee

Rectus Femoris

Extends the knee and steadies hip joint and helps iliopsoas flex thigh

Muscles of Anterior Thigh: Flexors of Hip Joint

Sartorius
Flexes, abducts, and laterally rotates thigh at hip joint

flexes leg at knee joint (medially rotating leg when knee is flexed)

**The 4 actions of sartorius produce the cross-legged position aka tailors position

Iliopsoas
acts conjointly in flexing thigh at hip joint

The psoas major is also a postural muscle that helps control the deviation of the trunk and is active during standing

Pectineus
Flexes and adducts thigh

assists with medial rotation of thigh