Where is the distal attachment of the triceps brachii located?

The distal attachment of the triceps brachii is located at the olecranon of the ulna. This bony prominence can be found at the posterior part of the elbow joint and plays a crucial role in the function of the triceps muscle. When the triceps brachii contracts, it extends the elbow by pulling on the olecranon, allowing for movement of the forearm away from the upper arm.

The olecranon serves as a lever arm for the muscle, enhancing its mechanical advantage when performing actions such as pushing or throwing. Understanding this attachment site is important for comprehending how the triceps functions during various upper limb movements. The other choices do not accurately reflect the location of the triceps brachii's distal attachment, as they relate to different muscles or structures unrelated to the triceps’ primary function.