Teres Minor

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Other Names Rotatory Cuff Back Heads Teres Minor Also see Teres Major. Movement Shoulder External Rotation Transverse Abduction Transverse Extension Posterior Stability Attachments Origin Scapula (Lateral) Lateral Border Posterior on upper and middle part Insertion Humerus Greater Tubercle (Posterior) Inferior Facet Related Muscles Works with the Infraspinatus. See other rotator cuff muscles: Infraspinatus Supraspinatus Subscapularis

Comments Teres Minor exerts only average of 17.5% and 15.4% shoulder external rotation force as compared to Infraspinatus in both 0° and 90° abducted shoulder positions, respectively (Hughes RE & An KN 1996). Teres Minor activity is remarkably high during prone horizontal abduction at 100° abduction with shoulder external rotation, exhibiting similar activity as infraspinatus (Blackburn TA, et al. 1990; Malanga GA, et al 1996). Shoulder abduction angle does not affect external rotation torque of Teres Minor. It has relatively constant external rotation moment arm (approximately 2.1 cm) any degree of shoulder abduction (Otis JC, et al. 1994). Teres Minor can produce only very small scapular plane adduction during maximal contraction (Hughes RE, An KN 1996) with adductor moment arm of approximately 0.2 cm at 45° of shoulder internal rotation and approximately 0.1 cm at 45° of shoulder external rotation.