The gluteal muscles are located on the posterior surface and include the

The gluteal muscles are located on the posterior

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The gluteal muscles are located on the posterior surface and include the gluteus maximus, gluteus medius, and gluteus minimus. The gluteus maximus is the largest muscle in the body; it forms the area of the buttocks and is the muscle on which you sit. The gluteus maximus has its origins on the ilium (coxal bone) and sacrum and inserts on the femur. It rotates the thigh laterally and extends the thigh at the hip, as in climbing stairs or walking. It produces the backswing of the leg while walking. The gluteus medius and gluteus minimus have their origins on the ilium (coxal bone) and insert on the femur. They abduct and rotate the thigh medially at the hip joint. Both the gluteus maximus and gluteus medius are commonly used sites for intramuscular injections. The iliopsoas is located near the groin; it has its origins on the lower vertebrae and ilium (coxal bone) and its insertion on the femur. Contraction of this muscle flexes and rotates the thigh laterally. The tensor fasciae latae is on the lateral thigh; it has its origin on the ilium (coxal bone) and inserts on the tibia. Contraction of this muscle flexes and abducts the thigh at the hip joint. The adductor muscles are located on the medial surface of the thigh; they have their origin on the lower coxal bones and insert on the medial and posterior surfaces of the femurs. This group of muscles adduct the thighs, pressing them together. Muscles That Move the Leg The muscles that move the leg are located in the thigh. The extensor muscles lie along the anterior and lateral surfaces of the leg, whereas the flexors lie along the posterior and medial surfaces. Muscles that move the legs include the quadriceps femoris, sartorius, hamstring group, and the gastrocnemius. The quadriceps femoris is located on the anterior thigh, is the most powerful muscle in the body, and has four heads as its origin. All four parts of the muscle insert on the tibia by the quadriceps ligament. The sartorius allows you to sit cross-legged on the floor. It assists in knee and hip flexion, abduction, and lateral rotation of the thigh.
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The hamstrings are a group of muscles located on the posterior surface of the thigh. All the muscles extend from the ischium (coxal bone) to the tibia. They flex the leg at the knee and are therefore antagonistic to the quadriceps femoris.. The tendons form the pit behind the knee called the popliteal fossa. Muscles That Move the Foot The tibialis anterior is located on the anterior surface. It has its origin on the tibia (shin bone) and inserts on the tarsal and metatarsal bones. It causes dorsiflexion and inversion of the foot. There are a number of muscles that cause plantar flexion. The peroneus longus muscle is on the lateral surface. It everts (turns outward) the foot, supports the arch of the foot, and assists in plantar flexion. The gastrocnemius and soleus are the major muscles on the posterior surface of the leg and form the calf of the leg. They attach to the calcaneus (heel bone) by the calcaneal tendon, or Achilles tendon.
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  • Fall '19
  • muscle weakness, muscle atrophy, functions of muscles

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