**Question:** All are TRUE about clavicle, except-

A. It is a long bone
B. It is a short bone
C. It is the only bone in the body that is horizontally oriented
D. It does not articulate with any other bone

**Core Concept:** The clavicle, also known as the collarbone, is a long, irregular-shaped bone that connects the scapula (shoulder blade) to the sternum (breastbone) in the human body. It plays a crucial role in providing structural support and facilitating movement between the upper limb and trunk during various activities.

**Why the Correct Answer is Right:**

Option A (It is a long bone) is incorrect because the clavicle is indeed a long bone, making it the only long bone that lies horizontally in the human body. This unique orientation allows for unimpeded movement between the scapula and sternum, enabling the full range of shoulder and chest movements.

Option B (It is a short bone) is incorrect because the clavicle is not short but rather a long bone. Its length (approximately 15 cm) is essential for its function as a horizontal link between the scapula and sternum, allowing for unrestricted movement at the shoulder joint.

Option C (It is the only bone in the body that is horizontally oriented) is incorrect because there are several bones in the body that are horizontally oriented, such as the ribs, which also move in a horizontal plane. The clavicle, however, is the only bone that is specifically designed to function as a horizontal link between the scapula and sternum, providing structural support and facilitating movement.

Option D (It does not articulate with any other bone) is partially correct because the clavicle does not directly articulate with any other bones apart from the sternum at the manubrium and the scapula at the acromion process. However, it indirectly articulates with other bones through its connection with these bones, allowing for the movement between the upper limb and trunk during various activities.

**Why Each Wrong Option is Incorrect:**

Option A (It is a long bone) is incorrect because the clavicle is indeed a long bone, which is essential for its role as a horizontal link between the scapula and sternum, enabling unrestricted movement at the shoulder joint.

Option B (It is a short bone) is incorrect because the clavicle is not short but long, which is essential for its function as a horizontal link between the scapula and sternum, allowing for unrestricted movement at the shoulder joint.

Option C (It is the only bone in the body that is horizontally oriented) is incorrect because there are other bones in the body that possess a horizontal orientation, such as the ribs. However, the clavicle is specifically designed to function as a horizontal link between the scapula and sternum, providing structural support and facilitating movement in the shoulder joint.

Option D (It does not articulate with any other bone) is partially correct because the clavicle does not directly articulate with any other bones apart from the sternum and scapula. However, it indirectly articulates with