Serratus posterior superior muscle

Last revised by Yuranga Weerakkody on 14 Sep 2019

The serratus posterior superior muscle is a thin, quadrilateral muscle of the posterior thorax. It extends from the vertebrae to the ribs and aids in deep inspiration.

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 2nd to 5th ribs 1-3.

The serratus posterior superior muscle is innervated by the 2nd to 5th intercostal nerves 3.

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 1
  • may insert onto the 2nd to 4th or 2nd to 5th ribs 3

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