🥇 ARTICULACIÓN ESTERNOCLAVICULAR. ¡Anatomía Rápida y Sencilla!

Anatomical Overview of the Sternoclavicular Joint

In this section, the speaker introduces the sternoclavicular joint and its anatomical features.

Articulation of Sternum and Clavicle

• The sternoclavicular joint is a pair found on both sides of the body. It includes the first costal cartilage, making it sometimes referred to as esternocostoclavicular.

• Understanding joint types is crucial; this joint is described as double reciprocal interlocking, leading to debates on its classification due to its unique mobility.

Surface Articulations

• Surfaces involved in this joint include the manubrium of the sternum, sternal notch, lateral part of the manubrium, first costal cartilage, and medial end of the clavicle.

• The presence of a fibrocartilaginous disc aids in congruence between clavicle and sternum surfaces for proper articulation.

Classification Challenges and Mobility Characteristics

This segment delves into challenges in classifying the sternoclavicular joint due to its unique characteristics.

Classification Complexity

• The joint's mobility complexity leads to varied classifications such as double reciprocal interlocking or ball-and-socket (enarthrosis).

• Discrepancies among authors regarding its classification highlight the intricate nature of this particular joint.

Movements and Features

• The joint exhibits diverse movements including circumduction, challenging traditional classifications.

• Despite efforts to categorize it accurately, consensus remains elusive across literature sources.

Superficial Articulations and Functionality

Exploring surface articulations within the sternoclavicular joint for better understanding of functionality.

Detailed Surface Analysis

• Surfaces involved encompass manubrium, sternal notch, lateral extensions, first costal cartilage with a unique disc structure aiding in articulation.

Understanding the Anatomy of the Sternoclavicular Joint

In this section, the speaker delves into the intricate details of the sternoclavicular joint, emphasizing the crucial role of structures like fibrocartilage discs and ligaments in maintaining stability and preventing dislocation.

The Significance of Fibrocartilage Disc in Articulation

• The fibrocartilage disc plays a vital role in maintaining contact between joint surfaces.

• It divides the synovial cavity into lateral and medial portions, enhancing joint functionality.

Ligaments Ensuring Stability

• Numerous ligaments, including sternoclavicular ligaments, prevent dislocation by securing joint surfaces.

• Ligaments like esternocostal radiado contribute to capsule reinforcement for stability.

Varied Ligament Functions

• Ligamento interclavicular connects clavicles and manubrium for added support.

• Costoclavicular ligament enhances joint stability through its unique attachment.

Muscle Functionality and Range of Motion

Exploring beyond ligaments, this segment highlights muscle involvement, particularly the subclavius muscle, in stabilizing the sternoclavicular joint. Additionally, it elucidates various movements achievable at this articulation.

Role of Subclavius Muscle

• The subclavius muscle aids in stabilizing the joint by attaching to specific bony landmarks.

Diverse Movements Possible

• Movements such as retraction, protraction, elevation, depression, rotation, and circumduction are facilitated by this versatile joint.