The upper back dentate muscle (m. Serratus posterior superior) is the muscle of the third layer of the superficial muscles of the back, located under the rhomboid muscle.
It starts from the lower part of the nuchal ligament , two (one) lower cervical and two upper thoracic vertebrae .
It goes down and laterally in bundles, which are attached by 4 teeth to 2–5 ribs , somewhat lateral to the corners on the outer surface.
The number of muscle bundles can vary, from an increase in their number to a complete absence of muscle.
| Serratus posterior superior muscle | |
|---|---|
| lat musculus serratus posterior superior | |
 Superficial back muscles, third layer. | |
| Start | digging ligament , 7 (6-7) cervical, 1-2 (3) thoracic vertebrae |
| Attachment | 2-5 rib |
| Blood supply | intercostal arteries , deep cervical artery |
| Innervation | intercostal nerves (Th1-4) |
| Function | raises ribs participating in the act of inspiration |
| Catalogs | |
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Function
Spreads ribs, participating in the act of inspiration. Refers to superficial muscles of the back.