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Shoulder Joint
Muscles of shoulder
| Question | Answer |
|---|---|
| Middle Deltoid- Origin | Lateral side of acromion process |
| Middle Deltoid- Insertion | Deltoid tuberosity |
| Middle Deltoid- Nerve Innervation | Axillary nerve (C5, 6) |
| Middle Deltoid- Action | Shoulder abduction |
| Anterior Deltoid -Origin | Lateral 1/3 of clavicle |
| Anterior Deltoid -Insertion | Deltoid Tuberosity |
| Anterior Deltoid - Nerve Innervation | Axillary nerve (C5,6) |
| Anterior Deltoid - Action | *Abduction *Flexion *Internal rotation |
| Posterior Deltoid- Origin | Spine of scapula |
| Posterior Deltoid- Insertion | Deltoid tuberosity |
| Posterior Deltoid- Nerve Innervation | Axillary nerve (C5,6) |
| Posterior Deltoid- Action | *Shoulder abduction |
| Pectoralis Major- Clavicular Head- Origin | Anterior surface of the medial ½ of clavicle |
| Pectoralis Major- Clavicular Head- Insertion | Lateral lip of bicipital groove of humerus |
| Pectoralis Major-Clavicular Head-Nerve Innervation | Medial & lateral pectoral nerve (C5,C6,C7,C8,T1 |
| Pectoralis Major-Clavicular Head- Action | Shoulder flexion-1st 60 |
| Pectoralis Major- Sternal Head- Origin | Sternum, coastal cartilage of 1st 6 ribs |
| Pectoralis Major- Sternal Head- Insertion | Lateral lip of bicipital groove of humerus |
| Pectoralis Major- Sternal Head- Nerve Innervation | Medial & lateral pectoral nerve (C5, C6, C7, C8, T1 |
| Pectoralis Major- Sternal Head- Action | *Shoulder extension-1st 60° (from 180°-120°) |
| Latissimus Dorsi- Origin | Spinous processes of T7 to L5, 9th to 12th ribs, & iliac crest |
| Latissimus Dorsi- Insertion | Floor of the bicipital groove of humerus |
| Latissimus Dorsi- Nerve Innervation | Thoracodorsal nerve (C6, C7, C8) |
| Latissimus Dorsi- Action | Shoulder extension * Adduction *Medial rotation *Hyper extension |
| Teres Major- Origin | Axillary border of scapula near inferior angle |
| Teres Major- Insertion | Crest below lesser tubercle; inferior to latissimus dorsi |
| Teres Major-Nerve Innervation | Lower sub scapular nerve (C5, C6, C7) |
| Teres Major- Action | Shoulder Extension *Adduction *Medial rotation |
| Supraspinatus- Origin | Supraspinous fossa of scapula |
| Supraspinatus- Insertion | Greater tubercle of humerus |
| Supraspinatus- Nerve Innervation | Suprascapular nerve (C5, 6) |
| Supraspinatus- Action | *Shoulder abduction |
| Infraspinatus- Origin | Infraspinous fossa of scapula |
| Infraspinatus- Insertion | Greater tubercle of humerus |
| Infraspinatus- Nerve Innervation | Suprascapular nerve (C5, 6) |
| Infraspinatus- Action | *Shoulder lateral rotation *Horizontal abduction |
| Teres Minor- Origin | Axillary border of scapula |
| Teres Minor-Insertion | Greater tubercle of humerus |
| Teres Minor- Nerve Innervation | Axillary nerve (C5,6) |
| Teres Minor- Action | *Shoulder lateral rotation *Horizontal abduction |
| Subscapularis- Origin | Subscapular fossa of scapula |
| Subscapularis- Insertion | Lesser tubercle of humerus |
| Subscapularis- Nerve Innervation | Upper & Lower Subscapular Nerves (C5,6) |
| Subscapularis- Action | Shoulder Medial rotation |
| Coracobrachialis- Origin | Coracoid process of scapula |
| Coracobrachialis- Insertion | Medial surface of humerus near midpoint |
| Coracobrachialis- Nerve Innervation | Musculocutaneous nerve (C6, C7) |
| Coracobrachialis- Action | Stabilizes shoulder joint |
| Biceps Brachii-Origin | Long Head: supraglenoid tubercle of scapula Short Head: coracoid process of scapula |
| Biceps Brachii- Insertion | Radial tuberosity & bicipital aponeurosis of radius |
| Biceps Brachii- Nerve Innervation | Musculocutaneous nerve |
| Biceps Brachii- Action | Elbow flexion *Forearm supination |
| Triceps Brachii- Origin | Long head: infra glenoid tubercle of scapula Lateral Head: inferior to greater tubercle on posterior humerus Medial Head: posterior surface of humerus |
| Triceps Brachii- Insertion | Posterior surface of olecranon process of ulna |
| Triceps Brachii- Nerve Innervation | Radial nerve (C7, C8) |
| Triceps Brachii- Action | *Elbow extension |