Podcast
Questions and Answers
What type of cartilage primarily composes the articular surfaces of the sternoclavicular joint?
What type of cartilage primarily composes the articular surfaces of the sternoclavicular joint?
Which statement best describes the mobility characteristics of the sternoclavicular joint?
Which statement best describes the mobility characteristics of the sternoclavicular joint?
What type of joint is the sternoclavicular joint classified as?
What type of joint is the sternoclavicular joint classified as?
What is the anatomical significance of the articular disk in the sternoclavicular joint?
What is the anatomical significance of the articular disk in the sternoclavicular joint?
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In terms of joint stability, how is the sternoclavicular joint positioned in relation to dislocations?
In terms of joint stability, how is the sternoclavicular joint positioned in relation to dislocations?
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What role does the costoclavicular ligament play in the sternoclavicular joint?
What role does the costoclavicular ligament play in the sternoclavicular joint?
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Which type of dislocation is more commonly associated with a blow to the anterior shoulder?
Which type of dislocation is more commonly associated with a blow to the anterior shoulder?
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What happens to the epiphyseal growth plate during dislocations in younger individuals?
What happens to the epiphyseal growth plate during dislocations in younger individuals?
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How does the articular disc contribute to the stability of the sternoclavicular joint?
How does the articular disc contribute to the stability of the sternoclavicular joint?
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Which statement about the mobility of the saddle joint is correct?
Which statement about the mobility of the saddle joint is correct?
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Which of the following statements about the costoclavicular ligament is true?
Which of the following statements about the costoclavicular ligament is true?
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Which arterial supply is NOT responsible for the sternoclavicular joint?
Which arterial supply is NOT responsible for the sternoclavicular joint?
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Which movement is NOT associated with the sternoclavicular joint?
Which movement is NOT associated with the sternoclavicular joint?
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What is a key feature that enhances the stability of the sternoclavicular joint?
What is a key feature that enhances the stability of the sternoclavicular joint?
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Which nerve is responsible for innervating the subclavius muscle?
Which nerve is responsible for innervating the subclavius muscle?
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In terms of mobility and stability, which statement is correct regarding the sternoclavicular joint?
In terms of mobility and stability, which statement is correct regarding the sternoclavicular joint?
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What role does the costoclavicular ligament play during shoulder elevation?
What role does the costoclavicular ligament play during shoulder elevation?
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Which of the following is NOT a thickening ligament related to the sternoclavicular joint?
Which of the following is NOT a thickening ligament related to the sternoclavicular joint?
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Study Notes
Sternoclavicular Joint
- Saddle joint, allowing movement in two axes.
- Articular disc provides smooth movement between clavicle and manubrium, enabling rotation and motion in a third axis.
- Strong joint capsule and ligaments, particularly the costoclavicular ligament, contribute to stability.
- Costoclavicular ligament transfers stress from clavicle to manubrium via costal cartilage.
- Dislocation of the sternoclavicular joint is rare and requires significant force.
- Costoclavicular ligament and articular disc effectively absorb and transmit forces away from the joint.
- Two types of dislocations:
- Anterior dislocations are more common, resulting from blows to the anterior shoulder.
- Posterior dislocations are caused by forces pushing the shoulder forward or direct impact.
- In younger individuals, the epiphyseal growth plate of the clavicle may be injured, causing a fracture alongside the dislocation.
- The costoclavicular ligament, composed of two parts, attaches to the first rib and the clavicle.
- It is a strong ligament, resisting elevation of the pectoral girdle.
- Sternoclavicular and interclavicular ligaments are thickenings of the joint capsule.
Neurovascular Supply
- The sternoclavicular joint receives blood supply from two arteries:
- Suprascapular artery, a branch of the thyrocervical trunk.
- Internal thoracic artery (mammarian artery), a branch of the subclavian artery.
- The joint is innervated by two nerves:
- Medial supraclavicular nerve (C3 and C4).
- Subclavius nerve (C5 and C6), innervating the subclavius muscle.
Movements
- Sternoclavicular joint allows for a wide range of motion:
- Elevation of the shoulders (shrugging)
- Depression of the shoulders (drooping)
- Protraction of the shoulders (moving the shoulder girdle anteriorly)
- Retraction of the shoulders (moving the shoulder girdle posteriorly)
- Rotation: When the arm is raised, the clavicle rotates passively.
- Costoclavicular ligament acts as a pivot for clavicle movements.
Mobility and Stability
- Sternoclavicular joint is highly mobile to accommodate upper limb movements.
- It provides stability as the only connection between the upper limb and the axial skeleton.
Joint Structure
- The sternoclavicular joint is a saddle-type synovial joint (double-plane joint) between the clavicle and manubrium.
- It is the only attachment of the upper limb to the axial skeleton.
- Despite its strength, it is a very mobile joint.
- Articular surfaces are covered with fibrocartilage.
Articular Disc
- Fibrocartilaginous articular disc separates the joint into two compartments.
- Similar to the temporomandibular joint.
Fibrocartilage
- Consists of white fibrous tissue and cartilaginous tissue.
- Tough, flexible, and elastic due to its composition.
- Contains type I collagen in addition to type II.
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Description
Explore the anatomy and mechanics of the sternoclavicular joint, a saddle joint that allows movement in multiple axes. Learn about its stability, the role of the costoclavicular ligament, and the types of dislocations that can occur. This quiz covers essential points about joint movement and potential injuries.
