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Serratus posterior superior
The serratus posterior superior (Latin: musculus serratus posterior superior) is a broad rectangular-shaped muscle of the back that is located in the upper back between the cervical and thoracic regions. It lies deep to the rhomboid muscles. The serratus posterior superior extends between the vertebrae of the spine and ribs of the thorax. It is smaller than the inferiorly located serratus posterior inferior muscle, and both muscles are separated by a wide distance. Together with the serratus posterior superior, the serratus posterior superior forms the intermediate layer of the back muscles.
|Serratus posterior superior|
|Origin||Spinous processes of cervical and thoracic vertebrae (C7 - T3)|
|Insertion||Superior borders of ribs 2 - 5|
|Action||Elevation of ribs 2 - 5, aids in inspiration|
|Innervation||Intercostal nerves 2nd - 5th|
|Blood supply||Posterior intercostal arteries|
The muscle fibers go in an inferolateral direction and insert on the superior borders of the 2nd to 5th ribs lateral to their angles.
The serratus posterior superior muscle elevates ribs 2 to 5. It is also one of the accessory respiration muscles and aids in inspiration.
The serratus posterior superior is innervated by the 2nd to 5th intercostal nerves.