ANATOMY OF CLAVICLE BONE ( PART -2 ) MUSCLE ATTACHMENTS AND OSSIFICATION

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LATERAL END:-

Articular surface gives attachment to the joint capsule. 

MEDIAL END :-

Articular surface gives attachment to :-
1. Fibrous capsule.
2. Articular disc posterosuperiorly. 
3. Interclavicular ligament superiorly.
 

LATERAL 1/3RD OF SHAFT:-

1. Anterior border - deltoid origin.
2. Posterior border - trapezius insertion. 
3. Conoid tubercle and trapezoid ridge - conoid and trapezoid parts of coracoclavicular ligament. 

MEDIAL 2/3RD OF SHAFT :-

1. Anterior surface - pectoralis major origin.
2. Rough superior surface - sternocliedo-mastoid origin ( Clavicular head). 
3. Inferior surface oval impression - costoclavicular ligament at medial end. 
4. Subclavian groove - subclavius muscle insertion. Margins of groove - clavipectoral fascia. 
5. Posterior surface ( medial end) - sternohyoid muscle origin. 

 • BRACHIAL PLEXUS CORDS AND SUBCLAVIAN ARTERY PASSES BEHIND INFERIOR SURFACE. 
 • NUTRIENT FORAMEN TRANSMITS A BRANCH OF SUPRASCAPULAR ARTERY. 



OSSIFICATION :-

• First bone to ossify. 
• Except medial end, it ossifies in membrane. 
• Two primary and one secondary centre. 
• Primary centre appear in shaft between 5th - 6th weeks of intrauterine life. 
• Fuses at 45th day.
• Secondary centre of medial end appears during 15-17 years. 
• Fuses with shaft at 21-22 years. 

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