Major skeletal muscles paired with their primary action and innervating nerve.
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- Primary action of the deltoid
- Shoulder abduction
- Innervation of the deltoid
- Axillary nerve
- Primary actions of the pectoralis major
- Adduction and medial rotation of the shoulder
- Innervation of the pectoralis major
- Lateral and medial pectoral nerves
- Primary actions of the latissimus dorsi
- Adduction, extension, and medial rotation of the shoulder
- Innervation of the latissimus dorsi
- Thoracodorsal nerve
- Primary action of the supraspinatus
- Initiates shoulder abduction (0 to 15 degrees)
- Innervation of the supraspinatus
- Suprascapular nerve
- Primary action of the infraspinatus
- External rotation of the shoulder
- Innervation of the infraspinatus
- Suprascapular nerve
- Primary action of the subscapularis
- Internal (medial) rotation of the shoulder
- Innervation of the subscapularis
- Subscapular nerve
- Primary action of the biceps brachii
- Flexion of the forearm
- Innervation of the biceps brachii
- Musculocutaneous nerve
- Primary action of the brachialis
- Flexion of the forearm