Which bone is located as the inner bone of the forearm, on the side opposite the thumb?

The ulna is the inner bone of the forearm, situated on the side opposite the thumb. In the anatomical position, where the person is standing upright with palms facing forward, the ulna runs parallel to the radius, which is located on the thumb's side. The ulna is typically larger at its proximal end, forming part of the elbow joint, and tapers toward the wrist where it articulates with the carpal bones.

Understanding the location of these bones is essential in EMT training, as they play a crucial role in forearm movements and stability. Recognizing the ulna's position is also vital in assessing injuries or conditions affecting the forearm, particularly fractures or dislocations. The other bones listed do not pertain to the forearm; the fibula and tibia are bones of the lower leg, while the radius is located on the thumb's side and does not fulfil the criteria of being on the inner side of the forearm.