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The triceps are posterior muscles of the upper arm that extend the shoulder and the elbow. They are composed of three heads:
- long head: originates at the scapula and inserts along with the lateral and medial heads into the elbow. This muscle assists with shoulder adduction and extension as well as elbow extension.
- lateral head: originates on the outer surface of the humerus. This portion inserts along with the long and medial heads into the elbow.
- medial head: originates on the medial surface of the humerus and inserts along with the lateral and long heads into the elbow.
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Located at the back of the upper arm, the tricep muscle has three parts. Each starts at a different location on the upper arm and shoulder blade and inserts into the elbow (ulna). It straightens (extends) the elbow and the shoulder.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.