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Detailed anatomy note of clavicle
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Anatomy of clavicle with ossification , side determination , attachments etc.
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ANATOMY OF CLAVICLEThe clavicle (Latin a small key) is along bone. It supports
the shoulder so that the arm can swing clearly away from the trunk. The clavicle transmits the
weight of the limb to the sternum. The bone has a cylindrical part called the shaft, and two ends,
lateral and medial.
Side Determination :
The side to which a clavicle belongs can be determined from the following characters.
1) The lateral end is flat, and the medial end is large and quadrilateral.
2) The shaft is slightly curved, s0 that it is convex forwards in its medial two-thirds, and concave
forwards in its lateral one-third.
3 ) The inferior surface is grooved longitudinally in its middle one-third.
Peculiarities of the Clavicle :
1) It is the only long bone that lies horizontally.
2) it is subcutaneous throughout.
3)i t is the first bone to start ossifying
4) It is the only long bone which ossifies in membrane,
5) it the only long bone which has two primary centres of ossification.
6) There is no medullary cavity.
7) It is occasionally pierced by the middle supraclavicular nerve.
It receives weight of upper limb via lateral one third through coracoclavicular ligament
weight of upper limb to the axial skel
two-thirds part.
Features :
Shaft :
The shaft is divisible into the lateral
one-third and the medial two-thirds. '
The lateral one-third of the shaft is flattened from above downwards. It has two borders, anterior
and posterior.The anterior border is concave forwards. The posterior border is convex
backwards. This part of the bone has
2 surfaces : superior and Inferior. The superior Surface is subcutaneous and the Interior surface
presents an elevation called the conoid ( Greek cone) tubercle and a ridge called the trapezoid
ridge.
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