serratus posterior superior muscle

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serra·tus pos·ter·i·or su·per·i·or mus·cle

(sĕ-rā't'ŭs pos-tēr'ē-ŏr sŭ-pēr'ē-ŏr mŭs'ĕl)
Upper intermediate muscle of back; origin, from spinous processes of two lower cervical and two upper thoracic vertebrae; insertion, into lateral side of angles of second-fifth ribs; nerve supply, first-fourth intercostals.
Synonym(s): musculus serratus posterior superior, superior posterior serratus muscle.