Humerus 1

Muscle on Humerus:-

1-supraspinatus

Origin	supraspinous fossa of scapula
Insertion	superior facet of greater tubercle of humerus
Artery	suprascapular artery
Nerve	suprascapular nerve
Actions	abduction of arm and stabilizes humerus see part on controversy of action.

2-

Subscapularis muscle

Origin subscapular fossa Insertion    lesser tubercle of humerus Artery transverse cervical artery,[1] subscapular artery Nerve upper subscapular nerve, lower subscapular nerve (C5, C6) Actions internally (medially) rotates humerus; stabilizes shoulder

Pectoralis major muscle Origin Clavicular head: anterior surface of the medial half of the clavicle. Sternocostal head: anterior surface of the sternum, the superior six costal cartilages, and the aponeurosis of the external oblique muscle Insertion    Lateral lip of the bicipital groove of the humerus Artery pectoral branch of the thoracoacromial trunk Nerve lateral pectoral nerve and medial pectoral nerve Clavicular head: C5 and C6 Sternocostal head: C7, C8 and  T1 Actions Clavicular head: flexes the humerus Sternocostal head: extends the humerus As a whole, adducts and medially rotates the humerus. It also draws the scapula anteriorly and inferiorly. Latissimus dorsi muscle Origin spinous processes of thoracic T7-L5, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs, inferior angle of scapula Insertion    floor of intertubercular groove of the humerus Artery thoracodorsal branch of the subscapular artery Nerve Thoracodorsal nerve Actions adducts, extends and internally rotates the arm Teres major muscle Origin posterior aspect of the inferior angle of the scapula Insertion    medial lip of the intertubercular sulcus of the humerus Artery Subscapular and circumflex scapular arteries Nerve Lower subscapular nerve (segmental levels C6 and C7) Actions Internal rotation (medial rotation) of the humerus      Deltoid muscle Origin the anterior border and upper surface of the lateral third of the clavicle, acromion, spine of the scapula Insertion    deltoid tuberosity of humerus Artery primarily posterior circumflex humeral artery Nerve Axillary nerve Actions shoulder abduction, flexion and extension Coracobrachialis muscle Origin coracoid process of scapula Insertion    medial humerus Artery brachial artery Nerve musculocutaneous nerve (C5, C6, and C7) Actions adducts humerus , flexes the arm at glenohumeral joint Brachialis muscle Origin anterior surface of the humerus, particularly the distal half of this bone Insertion    coronoid process and the tuberosity of the ulna Artery radial recurrent artery Nerve musculocutaneous nerve (C5, C6) Actions flexion at elbow joint   Brachioradialis Origin Lateral supracondylar ridge of the humerus Insertion    Distal radius (Radial styloid process) Artery radial recurrent artery Nerve radial nerve Actions Flexion of forearm Extensor carpi radialis longus muscle Origin lateral supracondylar ridge Insertion    2nd metacarpal Artery radial artery Nerve radial nerve Actions extensor at the wrist joint, abducts the hand at the wrist Common extensor tendon