STERNUM :
1. Sternum
is also called as Breast bone.
2. Sternum
is about 15 cm long and it is a flat , narrow bone located in the center of the
anterior thoracic wall.
3. Sternum
is divided into 3 parts .
v Manubrium : its handle like superior part
v The body : it is middle and largest part
v Xiphoid process : it is sword shaped inferior
smallest and terminal part.
4. The
segments of the sternum typically fuse by age 25 to form transverse ridges at
the points of fusion.
5. The
sternal angle is the junction of manubrium and body and the suprasternal notch
is the depression on the superior surface of manubrium.
6. Clavicular notches form sternoclavicular
joints with the medial ends of the clavicles.
7. The
manubrium also articulates with the costal cartilages of the first and second
ribs.
8. The
body of the sternum articulates directly or indirectly with the costal
cartilages of the second to tenth ribs.
9. Xiphoid
process is hyaline cartilage during infancy and childhood and completely
ossifies by about age 40.
10. It
provides attachment for some abdominal muscles.
11. Thoracic
surgeons may split the sternum along the midline and then hold the halves
together with wire sutures after surgery.
12. During
cardiopulmonary resuscitation (CPR), the
rescuer may fracture the xiphoid process driving it into internal organs.
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