ANATOMY OF CLAVICLE BONE (PART - 1)

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INTRODUCTION :-

• long S shaped bone. 
• Supports shoulder that arms can swing away from the trunk. 
• Transmits weight of the limb to the sternum. 
• Only long bone that lies horizontally and ossifies in membrane. 
• subcutaneous. 
• First bone to start ossifying. 

BONE DIVISION

1. Cylindrical shaft
2. Two ends lateral and medial. 

 GENERAL FEATURES

 SHAFT:- divided in two parts medial 2/3rd and lateral 1/3rd

 1. LATERAL 1/3rd :- 

 •Flattened from above downwards. 
 •Two borders 
 1. Anterior :- concave forwards
 2. Posterior :- convex backwards
 • Two surfaces:- 
 1. Superior :- subcutaneous 
 2. Inferior :- presents elevation called CONOID TUBERCLE and TRAPEZOID RIDGE. 
 2. MEDIAL 2/3rd :- rounded having four surfaces. 
 1. Anterior :- convex forwards
 2. Posterior :- smooth
 3. Superior :- Rough in its medial part
 4. Inferior :- Rough oval impression at the medial end. Longitudinal subclavian groove at lateral half. Nutrient foramen at lateral end of groove. 

  LATERAL AND MEDIAL ENDS:-

 1. Lateral end :-

• Known as Acromial end.
• Flattened from above downwards. 
• Bears facet for articulation with the acromion process of scapula to form ACROMIOCLAVICULAR JOINT. 

2. Medial end :- 

• Known as sternal end. 
• Quadrangular and articulates with the clavicular notch of the manubrim sterni to form STERNOCLAVICULAR JOINT. 
• Articular surface extends to the inferior aspect for articulation with the FIRST COASTAL CARTILAGE. 

SIDE DETERMINATION:-

• lateral end flat and medial end quadrangular and large. 
• curved shaft:- 
1. Convex forwards medial 2/3rd .
2. Concave forwards lateral 1/3 rd.
• Inferior surface is grooved longitudinally in middle 1/3 rd. 

SEX DETERMINATION:-

• Females:- Shorter, lighter, thinner, smoother and less curved than in males. 
• females:- lateral end little below medial end but in males both ends are at same level or either slightly higher than medial end. 

 
 
                  

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