Questions and Answers
Which muscle originates from the anterior border of the lateral one-third of the shaft of the clavicle?
What structure has its attachment site at the oval impression on the inferior surface at the medial end of the clavicle?
Which muscle does the subclavian groove primarily provide insertion for?
Where do the subclavian vessels and divisions of trunks of the brachial plexus pass towards the axilla?
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Which part of the coracoclavicular ligament is attached to the conoid tubercle?
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From which surface does the sternocleidomastoid muscle's clavicular head originate?
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Study Notes
Lateral One-Third of the Shaft
- The anterior border of the shaft is the origin point for the deltoid muscle, essential for shoulder movement.
- The posterior border serves as the insertion point for the trapezius muscle, which plays a key role in stabilizing the shoulder.
- The conoid tubercle and trapezoid ridge are attachment sites for the conoid and trapezoid parts of the coracoclavicular ligament, important for shoulder stability.
Medial Two-Thirds of the Shaft
- The majority of the anterior surface is the origin for the pectoralis major muscle, a major muscle involved in the movement of the shoulder joint.
- Approximately half of the rough superior surface provides the origin for the clavicular head of the sternocleidomastoid muscle, which rotates and flexes the neck.
- An oval impression on the inferior surface at the medial end is the attachment site for the costoclavicular ligament, reinforcing the clavicle's stability.
- The subclavian groove inserts the subclavius muscle, contributing to stabilization of the clavicle.
- Margins of the subclavian groove provide attachment to the clavipectoral fascia, which supports the structures beneath the clavicle.
- The posterior surface, near the medial end, is the origin point for the sternohyoid muscle, which helps with neck movement.
- Subclavian vessels and divisions of the trunks of the brachial plexus run towards the axilla, positioned between the inferior surface of the clavicle and the upper surface of the first rib.
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Description
Explore the anatomy of the clavicle, focusing on muscle origins and insertions. This quiz covers the attachment points for major muscles such as the deltoid, trapezius, and pectoralis major. Test your understanding of the anatomical features and functions related to the clavicle.
