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| The Clavicle |
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| Gross features |
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 Sigmoid
bone.
- Medial 2/3 convex anteriorly.
- Lateral 1/3 concave anteriorly.
Sternal
articular surface more rounded.
Inferior
surface rougher due to muscle and ligamentous attachments. |
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| Muscular attachments |
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| Some unique features
of the clavicle |
- Starts ossification during week 5, while the others
commence during week 8. Ossification is completed around 25 years,
while for the others, it is about 18-21 years.
- It runs a sigmoid horizontal course. Most long bones
are vertical and straight. (Compare with the femur
or tibia)
- It does not have a marrow cavity; its core is occupied
by spongy bone.
- The medial
2/3 ossifies endochondrally
while the lateral 1/3 ossifies intramembranously.
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| Functions of
the clavicle |
- Hold the upper limb away from the trunk and increase
the range of movement, especially abduction.
- Transmit weight from the upper limb to axial skeleton.
- Provide attachment for muscles.
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