Which bone of the arm or hand articulates with the clavicle medially?

• A. Sternum
• B. Humerus
• C. Radius
• D. Scapula

Answer: (D)

Verified step by step guidance

1. Step 1: Begin by understanding the anatomy of the shoulder girdle and its connections. The clavicle is a long bone that connects the upper limb to the trunk and articulates medially with the sternum at the sternoclavicular joint.
2. Step 2: Recognize that the clavicle also articulates laterally with another bone to form the acromioclavicular joint. This lateral articulation is with the scapula, specifically the acromion process of the scapula.
3. Step 3: Eliminate the incorrect options based on anatomical relationships: The sternum articulates medially with the clavicle but is not part of the arm or hand. The humerus and radius are bones of the arm and forearm, respectively, but do not articulate directly with the clavicle.
4. Step 4: Focus on the scapula, which is a flat bone located in the upper back. It serves as the attachment site for the clavicle laterally and forms part of the shoulder girdle.
5. Step 5: Conclude that the scapula is the correct answer because it articulates with the clavicle laterally at the acromioclavicular joint, connecting the arm to the trunk.