Muscle Description Functions

Deltoids Large, three-headed, triangular muscle of the shoulder

Rotate and life the arm

BicepsTwo-headed inner arm muscle extending from the deltoid to below the elbow

Lift and curl the arm and to pronate (twist downward) the wrist

Trapezius Flat triangular muscle of the upper back and neck

Lift the shoulder girdle and help turn the head

TricepsThree-headed outer arm muscle extending from the deltoid to below the elbow

Straighten the arm and supinate (twist upward) the wrist

Latissimus Dorsi

Large triangular muscles that extend from under the shoulders down to the small of the back

Pull the shoulders downward and to the back

Forearm Muscles on the outside and inside of the lower arm

Control the actions of the hand and wrist

Gluteus Large, powerful muscles of the buttocks

Maintains the trunk in an erect posture

Hamstrings

The thigh flexors at the rear of the upper leg

Curl the leg back

Calves Muscles at the rear of the lower leg

Flex the foot

PectoralisMuscles of the chest that cover the rib cage

Pull the arm and shoulder across the front of the body

Abdominals

Muscles of the stomach Flex and rotate the spinal column

Quadriceps

Muscles at the front of the thigh Extend and straighten the legMajor Skeletal Muscles of the

Human BodyDIRECTIONS Read the descriptions of the major skeletal muscles below. Fill in the blank spaces on the diagram with the name of the

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