Preferred Name |
sternum |
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Synonyms |
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ID |
http://purl.obolibrary.org/obo/UBERON_0000975 |
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connected to | ||
contributes to morphology of | ||
depiction |
http://upload.wikimedia.org/wikipedia/commons/1/12/Illu_thoracic_cage.jpg |
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editor note |
in EMAPA and EHDAA2 this is part of the skeleton of pectoral girdle; the classic def of pectoral girdle (see WP) excludes the rib cage and sternum |
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label |
sternum |
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only in taxon | ||
part_of | ||
prefixIRI |
UBERON:0000975 |
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prefLabel |
sternum |
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RO_0002175 | ||
treeView | ||
UBPROP_0000007 |
sternal |
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UBPROP_0000008 |
It probably first evolved in early tetrapods as an extension of the pectoral girdle; it is not found in fish. In amphibians and reptiles it is typically a shield-shaped structure, often composed entirely of cartilage. It is absent in both turtles and snakes. In birds it is a relatively large bone and typically bears an enormous projecting keel to which the flight muscles are attached. Only in mammals does the sternum take on the elongated, segmented form seen in humans. In some mammals, such as opossums, the individual segments never fuse and remain separated by cartilagenous plates throughout life in birds, either ratite (no keel or carina) or carinate (keel and carina present) |
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subClassOf |