sternum
Noun
Meaning
A plate of cartilage, or a series of bony or cartilaginous plates or segments, in the median line of the pectoral skeleton of most vertebrates above fishes; the breastbone.
The ventral part of any one of the somites of an arthropod.
Source: Webster's dictionarySynonyms
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Classification Definition Traditionally, Carinatae were defined as all birds whose sternum (breast bone) has a keel (carina).
An alternate definition was provided in 2001, naming Carinatae an apomorphy -based clade defined by the presence of a keeled sternum.
In 1892, Robert Weir experimented unsuccessfully with xenografts (duck sternum) in the reconstruction of sunken noses.
For example, an 8 gram projectile at 360 m/s impacting a NIJ level II vest over the sternum can produce an estimated pressure wave level of nearly 2.0 MPa (280 psi) in the heart and a pressure wave level of nearly 1.5 MPa (210 psi) in the lungs.
At the front of the chest, the breast tissue can extend from the clavicle (collarbone) to the middle of the sternum (breastbone).
In humans the second rib is defined as a true rib since it connects with the sternum through the intervention of the costal cartilage anteriorly (at the front).