definition - Levatores costarum muscles
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Interspinales Muscle
The levatores costarum muscles are a series of epaxial muscles in the thoracic region that receive their nerve supply from the dorsal rami of the spinal nerves. Developmentally, they are modified lateral parts of the intertransversarii muscles that have migrated laterally onto the ribs. The second group of segmental muscles are called the interspinales and the intertransversarii, which pass between neighboring spinous processes is the real segmental muscles of the back, which pass between adjacent transverse processes. They stabilize surrounding vertebrae to enable more efficient activity of the large muscle groups in actions. LEVATORES COSTARUM. ORIGIN Transverse processes C7 to T11: INSERTION Posterior surface and angle of rib below: ACTION Elevates ribs: NERVE Posterior primary rami.
Wikipedia
| Levatores costarum muscles | |
|---|---|
| Deep muscles of the back. (Levatores costarum labeled vertically at center left.) | |
| Latin | musculi levatores costarum |
| Gray's | subject #117 403 |
| Origin | Transverse processes of C7 to T12 vertebrae |
| Insertion | Superior surfaces of the ribs immediately inferior to the preceding vertebrae |
| Artery | |
| Nerve | dorsal rami C8-T11 |
| Actions | Assists in elevation of the thoracic rib cage |
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 have been suggested to have a proprioceptive function.
External links
- LUClc
- 597295163 at GPnotebook
- Levator+costarum+muscles at eMedicine Dictionary
This article was originally based on an entry from a public domain edition ofGray's Anatomy. As such, some of the information contained within it may be outdated.
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Levatores Costarum Innervation
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