Changes

=Costae=

=Costae=

[[Image:Thorax skeleton.png|thumb|right|150px|Canine thorax showing placement of mitral valve - Wikimedia Commons 2008]]

[[Image:Thorax skeleton.png|thumb|right|150px|Canine thorax showing placement of mitral valve - Wikimedia Commons 2008]]

Costae are arranged in pairs and articulate with two successive vertebrae. Inidividual ribs have a bony dorsal part, a body of rib, and ventral costal cartilage. They increase in length, curvature and amount of cartilage craniocaudally. The cartilage of last rib may fail to join that of its neighbor and is said to be a '''floating''' rib. Costae join ventrally on the midline at the '''Sternum''', which is comprised of three parts, the '''manubrium''', '''sternebrae''' and '''xiphoid cartilage'''. The '''manubrium''' is the most cranial and projects beyond the first set of ribs and can be palpated in most species. The '''sternebrae''' is joined by cartilage in young animals that is later replaced by bone and is the main body joining the ribs on the midline. The '''xiphoid Cartilage''' is caudal and projects between lower ends of costal arches, providing attachment for the '''linea alba'''.

Costae are arranged in pairs and articulate with two successive vertebrae. Inidividual ribs have a bony dorsal part, a body of rib, and ventral costal cartilage. They increase in length, curvature and amount of cartilage craniocaudally. The cartilage of last rib may fail to join that of its neighbor and is said to be a '''floating''' rib. Costae join ventrally on the midline at the '''sternum''', which is comprised of three parts, the '''manubrium''', '''sternebrae''' and '''xiphoid cartilage'''. The '''manubrium''' is the most cranial and projects beyond the first set of ribs and can be palpated in most species. The '''sternebrae''' is joined by cartilage in young animals that is later replaced by bone and is the main body joining the ribs on the midline. The '''xiphoid cartilage''' is caudal and projects between lower ends of costal arches, providing attachment for the '''linea alba'''.

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