Infraspinous fossa of scapula to greater tubercle of humerus.
Infraspinous fossa of the scapula. The Infraspinatus muscle attaches medially to the infraspinous fossa of the scapula and laterally to the middle facet of the greater tubercle of the humerus. The muscle arises by fleshy fibers from the medial two-thirds of the infraspinatous fossa, and by tendinous fibers from the ridges on its surface; it also arises from the infraspinatous fascia which covers it, and separates it from the teres major and teres minor.
Middle facet of greater tubercle of the humerus.
The infraspinatus attaches to the middle facet of the greater tubercle.
Laterally rotates arm at shoulder.
It rotates the head of the humerus laterally and assists in stabilizing the humerus in the glenoid cavity. American Academy of Manual Medicine
The infraspinatus is the main external rotator of the shoulder. When the arm is fixed, it abducts the inferior angle of the scapula. Its synergists are teres minor and the deltoid. The infraspinatus and teres minor rotate the head of the humerus outward (external, or lateral, rotation); they also assist in carrying the arm backward. Additionally, the infraspinatus reinforces the capsule of the shoulder joint. Wiki
Innervation – Nerve control
The suprascapular nerve innervates the supraspinatus and infraspinatus muscles. These muscles function to abduct and laterally rotate the arm, respectively. Wiki
Suprascapular and circumflex scapular arteries.
The suprascapular artery, also known as the transverse scapular artery, is a branch of the thyrocervical trunk, while the circumflex scapular artery (scapular circumflex artery, dorsalis scapulae artery) is a branch of the subscapular artery and part of the scapular anastomoses. Wiki
Pectoralis major, Pectoralis minor, Subclavius, Serratus anterior, Latissimus dorsi, Trapezius, Rhomboid major, Rhomboid minor, Levator scapulae.
Pictures of muscles
Trigger Point Referrals