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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 |