serratus posterior superior muscle
- origin: ligamentum nuchae, spinous processes of C7-T3 and supraspinous ligament
- insertion: superior border of 2 to 5 ribs
- innervation: 2 to 5intercostal nerves
- arterial supply: intercostal arteries
- action: elevates ribs
The serratus posterior superior muscle forms from a thin, broad aponeurosis which is attached to the lower part of the ligamentum nuchae, spinous processes of C7 to T3 vertebrae, and intervening supraspinous ligament. It passes inferolaterally and inserts onto the superior border, just lateral to the angles of the 2 to 5ribs .
The serratus posterior superior muscle is innervated by the 2 to 5intercostal nerves .
This muscle elevates the superior ribs which aids in inspiration.
- may originate from the spinous processes of C7 and upper two or three thoracic vertebrae
- may insert onto the 2 to 4 or 2 to 5 ribs