The triceps muscle is the large muscle on the back of your upper arm responsible for extending your elbow joint. It's named "triceps" because it has three heads, or points of origin.
Here's a more detailed breakdown:
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Definition: The triceps brachii (Latin for "three-headed muscle of the arm") is a large, three-headed muscle on the posterior (back) side of the upper arm. It is the primary extensor of the elbow joint.
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Origin (Where it starts): The triceps originates from three different locations:
- Long Head: Arises from the infraglenoid tubercle of the scapula (just below the shoulder socket).
- Lateral Head: Originates from the posterior surface of the humerus (the upper arm bone), above the radial groove.
- Medial Head: Originates from the posterior surface of the humerus, below the radial groove.
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Insertion (Where it ends): All three heads converge to insert onto the olecranon process of the ulna (the bony point of the elbow).
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Function: Its primary function is extension of the elbow joint, which straightens the arm. The long head also assists in adduction (bringing the arm towards the body) and extension of the shoulder joint.
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Importance: The triceps is essential for pushing movements, stabilizing the elbow, and overall arm function. It's used in many everyday activities, from pushing doors open to lifting objects.
In summary, your triceps muscle is a three-headed muscle located on the back of your upper arm that allows you to straighten your elbow.
