Supraspinatus

  • The supraspinatus muscle (or simply supraspinatus, Latin: musculus supraspinatus) is a triangular muscle of the shoulder girdle, which belongs to the group of rotator cuff muscles.

    Origin

    The supraspinatus originates from the walls of the supraspinous fossa of the scapula.

    Insertion

    The supraspinatus completely fills the supraspinous fossa, passes laterally and inserts onto the greater tubercle of the humerus.

    Action

    The supraspinatus provides abduction of the upper arm and stabilizes the glenohumeral joint.

    Innervation

    The supraspinatus muscle is innervated by the suprascapular nerve (C5).

    Blood supply

    The arterial blood to the supraspinatus is mainly supplied by the suprascapular artery, which is a branch of the thyrocervical trunk in the neck.