Levatores costarum muscles
|Levatores costarum muscles|
Deep muscles of the back. (Levatores costarum labeled vertically at center left.)
|Origin||Transverse processes of C7 to T11 vertebrae|
|Insertion||Superior surfaces of the ribs immediately inferior to the preceding vertebrae|
|Nerve||dorsal rami C8-T11 (Intercostal nerves)|
|Actions||Assists in elevation of the thoracic rib cage|
|Latin||Musculi levatores costarum|
|Anatomical terms of muscle|
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The Levatores costarum (/ /), twelve in number on either side, are small tendinous and fleshy bundles, which arise from the ends of the transverse processes of the seventh cervical and upper eleven thoracic vertebrae
They pass obliquely downward and laterally, like the fibers of the Intercostales externi, and each is inserted into the outer surface of the rib immediately below the vertebra from which it takes origin, between the tubercle and the angle (Levatores costarum breves).
Each of the four lower muscles divides into two fasciculi, one of which is inserted as above described; the other passes down to the second rib below its origin (Levatores costarum longi).
Their role in normal inspiration, if any, is uncertain. They may play a role in vertebral movement and/or proprioception.
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