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It is in the bone in the center of your ribcage. Your "Sternum". The Sternomanubrial joint articulates the body of your sternum with the upper portion of your sternium, also called the "Manubrium".
the second pair of ribs
The costal angle is the angle beneath the the sternum. It is created by the costal cartilage that joins what are called the false ribs, the ones tha6t do not directly attach to the sternum via their own cartilage, but attach directly and indirectly to the cartilage of the 7th rib. This angle is created because these false ribs get shorter as they go down. Since they are connected by the descending costal cartilage which travels laterally and inferiorly from the sternum, it creates the angle known as the costal angle.
A protractor will indicate an angle that has to be made.
It is the angle at which the manibrium and sternum meet/articulate. It is an anatomical landmark for finding the second rib, approx. area of the carina
With a small square in its corner
at the center of sternum
Locate the middle of the sternum. This is where your hand location should be for an adult or child. For an infant, it will be on the sternum, 1 finger below the nipple line.
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The square drawn in a right angle simply is to indicate that the angle is, indeed, 90 degrees.
Are used to indicate the location or position of objects.
It is a beautiful heavenly female at rest.