Musculus teres minor

The teres minor muscle is one of the four muscles that make up the rotator cuff, the others being: supraspinatus, infraspinatus, and subscapularis.

Summary

• origin: middle third of the lateral border of the scapula
• insertion: inferior facet of the greater tubercle of the humerus
• innervation: axillary nerve (C5-6)
• arterial supply: circumflex scapular artery 
• action: external rotation, weak adductor of the humerus, stabilizes the shoulder joint, holds the head of the humerus down against the upward pull of the deltoid during arm abduction

Gross anatomy

Teres minor originates from the middle third of the lateral border of the scapula, superior to the attachment of the teres major muscle. As it passes superolaterally, it runs adjacent to the lower border of infraspinatus and posterior to the long head of triceps brachii muscle. The lower portion of teres minor runs alongside teres major muscle before the latter passes anterior to the long head of triceps. The tendon of the muscle fuses with the articular capsule of the humerus before inserting on the inferior facet of the greater tubercle.

Siehe auch:

• Rotatorenmanschette
• Musculus infraspinatus
• Musculus supraspinatus
• Musculus subscapularis
• Musculus teres major

und weiter:

• Bursa subacromialis
• Schultermuskulatur
• Oberarmmuskulatur
• Schulter Anatomie
• quadrangular space
• Schultergelenksmuskulatur
• Tuberculum majus Ansatz
• pathology of the teres minor