Teres minor muscle
|Teres minor muscle|
|Suprascapular and axillary nerves of right side, seen from behind. (Teres minor is visible at center.)|
|Muscles on the dorsum of the scapula, and the Triceps brachii muscle: #3 is Latissimus dorsi muscle|
#5 is Teres major muscle
#6 is Teres minor muscle
#7 is Supraspinatus muscle
#8 is Infraspinatus muscle
#13 is long head of Triceps brachii muscle
|Latin||musculus teres minor|
|Gray's||subject #123 441|
|Origin||lateral border of the scapula|
|Insertion||inferior facet of greater tubercle of the humerus|
|Artery:||lateral circumflex humeral artery and the circumflex scapular artery|
|Action:||laterally rotates and adducts the arm|
The Teres minor is a narrow, elongated muscle of the rotator cuff.
Origin and insertion
It arises from the dorsal surface of the axillary border of the scapula for the upper two-thirds of its extent, and from two aponeurotic laminæ, one of which separates it from the Infraspinatus, the other from the Teres major.
Its fibers run obliquely upward and lateralward; the upper ones end in a tendon which is inserted into the lowest of the three impressions on the greater tubercle of the humerus; the lowest fibers are inserted directly into the humerus immediately below this impression.
The tendon of this muscle passes across, and is united with, the posterior part of the capsule of the shoulder-joint.
The Infraspinatus and Teres minor rotate the head of the humerus outward; they also assist in carrying the arm backward.
Sometimes a group of muscle fibres from teres minor may be fused with Infraspinatus.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.