It is situated at the upper back part of the thorax, deep to the rhomboid muscles.

The serratus posterior superior muscle arises by an aponeurosis from the lower part of the nuchal ligament, from the spinous processes of C7, T1, T2, and sometimes T3, and from the supraspinal ligament.

[2] The serratus posterior superior muscle elevates the second to fifth ribs.

[citation needed] This aids deep respiration.

[citation needed] This article incorporates text in the public domain from page 404 of the 20th edition of Gray's Anatomy (1918)