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

Dr.G Bhanu Prakash Animated Medical Videos

12 Apr 201703:21

Summary

TLDRThis 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.

Outlines

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🦴 Overview of the Clavicle

The clavicle, also known as the collar bone, is a long, horizontally-lying bone at the front of the neck, forming part of the shoulder girdle. It is the only long bone that lacks a medullary cavity. The clavicle connects the upper limb to the trunk, transmitting weight and assisting arm movements above shoulder level. It is composed of a shaft, an acromial end, and a sternal end.

🔍 Anatomy of the Clavicular Shaft

The clavicular shaft is divided into a lateral third and a medial two-thirds. The lateral third has two surfaces and two borders: the superior surface, which is subcutaneous, and the inferior surface, which is rough and has the conoid tubercle for ligament attachment. The anterior border is concave with the deltoid tubercle, while the posterior border is convex.

🩻 Medial Two-Thirds of the Clavicle

The medial two-thirds of the clavicle has four surfaces: the rough, convex anterior surface; the smooth, concave posterior surface; the upper surface; and the inferior surface. The latter features the costal impression for ligament attachment and the subclavian groove, which anchors the pectoral fascia and contains the nutrient foramen.

🔗 Acromial and Sternal Ends of the Clavicle

The acromial end of the clavicle is flat with an oval facet that articulates with the acromion process of the scapula, forming part of the acromioclavicular joint. The sternal end is quadrangular, articulating with the manubrium of the sternum. This end also provides attachment points for ligaments and the articular disc of the sternoclavicular joint.

Mindmap

Keywords

💡Clavicle

The clavicle, commonly known as the collarbone, is a long bone located at the front of the neck. It plays a vital role in forming the shoulder girdle and transmitting the weight from the upper limb to the trunk. In the script, it is described as the only long bone in the body that lies horizontally, crucial for arm movement above the shoulder level.

💡Collar Bone

Also referred to as the clavicle, the collarbone is situated in front of the neck and contributes to shoulder structure. Its horizontal positioning makes it unique among long bones, supporting the transmission of upper limb weight to the body. This bone aids in arm mobility, particularly above the shoulder.

💡Shaft

The shaft of the clavicle is divided into two sections: the lateral one-third and the medial two-thirds. Each section has distinct anatomical features, such as the conoid tubercle and the trapezoid line. These features provide attachment points for muscles and ligaments that contribute to shoulder stability and mobility.

💡Acromial End

The acromial end of the clavicle is flat and features an oval facet that articulates with the acromion process of the scapula. This articulation forms part of the acromioclavicular joint, crucial for shoulder movement. The script describes the surrounding ligaments that contribute to joint stability.

💡Sternal End

The sternal end of the clavicle is quadrangular in shape and connects with the manubrium of the sternum. This forms the sternoclavicular joint, which allows for movement of the clavicle and upper limb. The script notes the attachment of ligaments, such as the interclavicular ligament, to this end.

💡Conoid Tubercle

Located on the inferior surface of the lateral third of the clavicle, the conoid tubercle serves as an attachment point for the conoid part of the coracoclavicular ligament. This structure is essential for stabilizing the shoulder and connecting the clavicle to the scapula.

💡Trapezoid Line

The trapezoid line is an oblique ridge running along the lateral third of the clavicle. It provides an attachment site for the trapezoid part of the coracoclavicular ligament, helping to stabilize the shoulder joint. This anatomical feature plays a significant role in linking the clavicle to the scapula.

💡Subclavian Groove

The subclavian groove is located on the inferior surface of the medial two-thirds of the clavicle. It serves as a site for muscle and ligament attachment, including the subclavius muscle and pectoral fascia. This groove contributes to the overall structural integrity of the shoulder.

💡Coracoclavicular Ligament

The coracoclavicular ligament is composed of two parts: the conoid and the trapezoid ligaments. Both parts attach the clavicle to the coracoid process of the scapula, playing a crucial role in stabilizing the acromioclavicular joint and allowing for efficient shoulder movement.

💡Sternoclavicular Joint

The sternoclavicular joint is formed by the articulation between the sternal end of the clavicle and the manubrium of the sternum. This joint is reinforced by ligaments such as the interclavicular ligament and the capsular ligament, enabling mobility and stability for the upper limb and shoulder.

Highlights

The clavicle is also known as the collar bone and is a long bone.

It lies in front of the root of the neck and takes part in the formation of the shoulder girdle.

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

This bone has no medullary cavity, which is a peculiarity of the clavicle.

The clavicle is the first bone to start ossifying and transmits weight from the upper limb to the trunk.

It assists in the movement of the arm above the level of the shoulder.

The clavicle consists of the shaft, acromial end, and sternal end.

The shaft is divided into the lateral 1/3 and medial 2/3.

The lateral 1/3 presents two surfaces and two borders, with the superior surface being subcutaneous.

The inferior surface of the lateral 1/3 has the conoid tubercle, which gives attachment to the conoid part of the coracoclavicular ligament.

The trapezoid line runs obliquely and laterally, providing attachment to the trapezoid part of the coracoclavicular ligament.

The medial 2/3 of the clavicle has four surfaces, including a rough, convex anterior surface and a smooth, concave posterior surface.

The inferior surface of the medial 2/3 presents the costal impression, which gives attachment to the costoclavicular ligament.

The acromial end is flat with an oval facet that articulates with the acromion process of the scapula.

The sternal end is quadrangular and articulates with the clavicular notch of the manubrium, connecting to the sternoclavicular joint.