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Teres minor

The teres minor (Latin: musculus teres minor) is a round muscle in the shoulder, which belong to the rotator cuff muscles.

Origin

The teres minor muscle arises from the lateral border of the scapula.

Insertion

The fibers of the teres minor pass laterally to the humerus and insert onto the greater tubercle of the humerus.

Action

The teres minor stabilizes the glenohumeral joint and provides external rotation and extension of the upper arm.

Innervation

The teres minor is innervated by the axillary nerve (C5).

Blood supply

The arterial blood to the teres minor is supplied mainly by the circumflex humeral arteries.