Teres Minor Muscle
Origin: On the dorsal surface of the middle half of the lateral border of the scapula.
Insertion: The lowest facet of the greater tubercle of the humerus.
Actions: External rotation of the arm at the shoulder
Innervation: Axillary nerve (C5, C6).
Blood Supply: Circumflex scapular and posterior circumflex humeral arteries from the axillary artery.
Primary Actions of the Teres Minor
1. External rotation of the arm at the shoulder
Agonists:
- Infraspinatus
- Deltoid (posterior part)
Antagonists:
- Deltoid (anterior part)
- Subscapularis
- Pectoralis major
- Teres major
- Latissimus dorsi
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Secondary Actions of the Teres Minor
1. Assists with adduction of the arm at the shoulder
Agonists:
- Latissimus dorsi
- Pectoralis major
- Teres major
Antagonists:
- Deltoid (middle part)
- Supraspinatus
Coracobrachialis also assists with adduction of the arm at the shoulder.
1. Assists with depression of the humeral head
Agonists:
- Infraspinatus
- Subscapularis
Teres minor acts to clear the greater tubercle of the humerus under the acromial arch of the scapula.
Muscle Pain Information: The teres minor muscle contributes to pain in the back of the shoulder, and tingling in the fourth and fifth fingers.
An excellent book for those beginning the study of anatomy. Coloring helps memory retention.
For intermediary anatomy students learning skeletal and muscle structure.
For beginning and intermediary anatomy . Muscle overlays on the human body. Excellent visuals!