Clavicle Anatomy Animation | General features, Osteology, Attachments, Development, clinical anatomy

Summary

This script provides an in-depth overview of the clavicle, commonly known as the collarbone. It describes the bone's structure, its role in connecting the upper limb to the trunk, and its function in arm movement. The clavicle's unique horizontal orientation and lack of a medullary cavity are noted. The description details the bone's shaft, acromial end, sternal end, and various surfaces, highlighting their anatomical features, including ligament attachments and articulations with other bones such as the scapula and sternum.

Takeaways

• 🦴 The clavicle is also known as the collarbone and is a long bone that lies horizontally in the body.
• 🏋️‍♂️ It transmits weight from the upper limb to the trunk and helps in arm movement above the shoulder level.
• 👕 The clavicle is a subcutaneous bone, meaning it is located just beneath the skin.
• ❌ Unlike other long bones, the clavicle does not have a medullary cavity.
• ⏳ It is the first bone to begin the process of ossification (bone formation).
• 🔗 The lateral 1/3 of the clavicle is divided into two surfaces and two borders, with specific landmarks like the conoid tubercle and trapezoid line, which attach to ligaments.
• ⚖️ The medial 2/3 of the clavicle has four surfaces, with the anterior being rough and convex, and the posterior being smooth and concave.
• 🦵 The inferior surface of the clavicle has the costal impression, which connects to the costoclavicular ligament, and the subclavian groove, where the pectoral fascia attaches.
• ⚙️ The acromial end of the clavicle is flat and articulates with the acromion process of the scapula, forming part of the acromioclavicular joint.
• 🔲 The sternal end of the clavicle is quadrangular and articulates with the manubrium of the sternum, forming part of the sternoclavicular joint.

Q & A

What is another name for the clavicle?

The clavicle is also known as the collarbone.

What is unique about the orientation of the clavicle compared to other long bones in the body?

The clavicle is the only long bone in the body that lies horizontally.

Does the clavicle have a medullary cavity?

No, the clavicle does not have a medullary cavity.

What are the main functions of the clavicle?

The clavicle transmits weight from the upper limb to the trunk, forms part of the shoulder girdle, and assists in movement of the arm above shoulder level.

How is the shaft of the clavicle divided?

The shaft of the clavicle is divided into the lateral one-third and the medial two-thirds.

What is the function of the conoid tubercle on the clavicle?

The conoid tubercle gives attachment to the conoid part of the coracoclavicular ligament.

Where does the trapezoid part of the coracoclavicular ligament attach on the clavicle?

The trapezoid part of the coracoclavicular ligament attaches to the trapezoid line, an oblique ridge on the inferior surface of the clavicle.

What are the key characteristics of the medial two-thirds of the clavicle?

The medial two-thirds of the clavicle has four surfaces: the anterior surface (rough and convex), the posterior surface (smooth and concave), the upper surface, and the inferior surface, which includes the costal impression for attachment to the costoclavicular ligament.

What does the acromial end of the clavicle articulate with?

The acromial end of the clavicle articulates with the clavicular facet on the acromion process of the scapula.

What does the sternal end of the clavicle articulate with?

The sternal end of the clavicle articulates with the clavicular notch of the manubrium sterni and is associated with the sternoclavicular joint.