Which bone is the smaller bone in the lower arm?

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Study for the Muscular System and Skeletal System Exam. Learn with flashcards and multiple choice questions, where each question has explanations and hints. Be well-prepared and confident on your test day!

Multiple Choice

Which bone is the smaller bone in the lower arm?

Explanation:
In the forearm there are two long bones that run parallel: the radius and the ulna. The ulna is the longer, thicker bone on the inside (toward the pinky), while the radius is the smaller bone on the outside (toward the thumb). So the smaller bone of the lower arm is the radius. The carpal bones are in the wrist, the metacarpals are in the hand, and the two forearm bones work together to allow rotation of the arm (pronation and supination) around each other at the radioulnar joints.

In the forearm there are two long bones that run parallel: the radius and the ulna. The ulna is the longer, thicker bone on the inside (toward the pinky), while the radius is the smaller bone on the outside (toward the thumb). So the smaller bone of the lower arm is the radius. The carpal bones are in the wrist, the metacarpals are in the hand, and the two forearm bones work together to allow rotation of the arm (pronation and supination) around each other at the radioulnar joints.

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