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MUSCLES OF THE TRUNK Trunk muscles control breathing and the movements of the abdomen and the pelvis ◦ ◦ ◦ ◦ ◦ External intercostals Diaphragm Rectus abdominis External oblique Internal oblique Trunk External intercostals ◦ Location: found b/w the ribs ◦ Function: raises the ribs to help in breathing Diaphragm ◦ Location: dome-shaped muscle separating the thoracic and abdominal cavities ◦ Function: control breathing Trunk Rectus abdominis ◦ Location: extends from the ribs to the pelvis ◦ Function: compresses the abdomen. External oblique ◦ Location: anterior inferior edge of the last 8 ribs ◦ Function: depresses ribs, flexes the spinal column, compresses the abdominal cavity Trunk Internal oblique ◦ Location: beneath the external oblique, fibers running the opposite direction ◦ Function: depresses ribs, flexes the spinal column, compresses the abdominal cavity MUSCLES OF THE LOWER EXTREMITIES Assist in the movement of the thigh, leg, ankle, foot, and toes ◦ ◦ ◦ ◦ ◦ Gluteus maximus Gluteus medius Tensor fasciae Peroneus longus Rectus femoris - Tibialis anterior - Gastrocnemius - Soleus Lower Extremities Gluteus maximus ◦ Location: forms the buttocks ◦ Function: extends femur and rotates it outward. Gluteus medius ◦ Location: extends from deep femur to buttocks ◦ Function: abducts and rotates the thigh Lower Extremities Tensor fasciae ◦ Location: flat muscle found along the upper lateral surface of thigh ◦ Function: flexes, abducts, medially rotates thigh. Rectus femoris ◦ Location: anterior thigh ◦ Function: flexes thigh and extends lower leg Lower Extremities Tibialis anterior ◦ Location: front of tibia bone ◦ Function: dorsiflexes the foot; permits walking on the heels Lower Extremities Gastrocnemius ◦ Location: calf ◦ Function: points toes and flexes lower leg. Soleus ◦ Location: broad flat muscle found beneath calf ◦ Function: extends foot Lower Extremities Peroneus longus ◦ Location: superficial muscle found on the lateral side of the leg ◦ Function: extends and everts the foot and supports the arches.
