Infraspinatus Muscle - Attachments, Actions & Innervation
Teres Minor Muscle – Attachments, Actions & Innervation
Teres minor is one of four muscles that comprise what’s called the Rotator Cuff. It’s narrow and elongated in shape and sometimes may be fused with infraspinatus. Its main function is to stabilize the humerus in the glenoid fossa when the shoulder moves.
Attachments of Teres Minor :Origin & Insertion
Origin: (proximal attachment)
a. Middle part of the lateral (axillary) border of the scapula.
Insertion: (distal attachment)
a. Inferior aspect of greater tubercle of humerus.
Actions of Teres Minor:
a. Laterally rotates the arm at the shoulder (glenohumeral) joint.
b. Weakly adducts the arm at the shoulder (glenohumeral) joint.
c. Helps stablize the shoulder by drawing the humerus toward the glenoid fossa of the scapula.
Innervation of Teres Minor:
Nerve to the muscle:
a. Axillary nerve.
a. C5 and C6.