Shoulder Joint & Girdle Muscles & Actions

Tiger Training

Today I’m studying for the AFAA Personal Fitness Trainer Certification. My focus is the shoulder joint and shoulder girdle muscles and their actions. I’m creating a workable schema to fit all these bits of information together. I will remember the muscles responsible for the following shoulder joint actions (prime movers in italics; assistors in regular):

  • Flexion: Anterior Deltoid, Pectoralis Major (clavicular), Coracobrachialis, Subscapularis^, Biceps (short head)
  • Extension: Pectoralis Major (sternal), Latissimus Dorsi, Teres Major, Posterior Deltoid, Triceps (long head)
  • Abduction: Medial Deltoid, Supraspinatus, Anterior Deltoid, Pectoralis Major (clavicular)*, Subscapularis^, Biceps (long head)
  • Adduction: Pectoralis Major (sternal), Latissimus Dorsi, Teres Major, Coracobrachialis*, Subscapularis*, Biceps (short head), Triceps (long head)
  • Internal Rotation: Subscapularis, Teres Major, Anterior Deltoid, Pectoralis Major (clavicular), Pectoralis Major (sternal), Coracobrachialis*, Latissimus Dorsi, Biceps (short head)
  • External Rotation: Infraspinatus, Teres Minor, Posterior Deltoid, Coracobrachialis+
  • Horizontal Adduction: Anterior Deltoid, Pectoralis Major (clavicular)…

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