Final answer:
The ulna and radius are the two main bones of the forearm, with the ulna having crucial attachments for muscle functions like the triceps brachii.
Explanation:
Ulna and radius are the two bones of the forearm, with the ulna being the medial bone and the radius the lateral bone. The ulna has important processes like the olecranon process for the attachment of the triceps brachii muscle, responsible for extending the forearm and arm.
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