Answer | Question |
Pectoralis Major - origin | Origin: anternal medial clavicle, sternum, costal cartilages, aponeurosis of external oblique |
P. Major - insertion | Insertion: lateral intertubercular sulcus |
P, Major - Action | Action: adducts, flexes, and medially rotates humerus |
P, Major - Innervation | lateral and medial pectoral nerves |
P. Minor - origin | origin - ribs 3-5 |
P. Minor - insertion | coracoid process of scapula |
P. Minor - Action | stabilizes scapula and draws it forward |
P. Minor - Innervation | Medial Pectoral Nerve |
Subclavius - Origin | 1st Rib |
Subclavius - Insertion | middle of clavicle |
Subclavius - Action | depresses clavicle |
Subclavius - Innervation | nerve to subclavius |
Latissimus Dorsi - Origin | Spines of 6 thoracic vertebrae, thorocolumnar fascia, iliac crest, lower 3 or 4 ribs. |
Latissimus Dorsi - Insertion | floor of intertubercular sulcus |
Latissimus Dorsi - Action | adducts, extends and rotates arm medially |
Latissimus Dorsi - Innervation | Thoracodorsal Nerve |
Rhomboid Minor - Origin | spinous processes of C7-T1, ligamentum nuchae |
Rhomboid Minor - Insertion | vertebral border of scapula at root of the spine |
Rhomboid Minor - Action | retracts and rotates scapula, fixes scapula to thoracic wall |
Rhomboid Minor - Innervation | dorsal scapular nerve (C4, C5) |
Rhomboid Major - Origin | spinous process of T2-T5 |
Rhomboid Major - Insertion | vertebral border of scapula below root of spine |
Rhomboid Major - Action | retracts and rotates scapula, fixes scapula to thoracic wall |
Rhomboid Major - Innervation | Dorsal Scapular Nerve (C4, C5) |
Teres Minor - Origin | lower axillary border of scapula |
Teres Minor - Insertion | lower facet of greater tubercle of humerus |
Teres Minor - Action | Rotates arm laterally (with infraspinatous) |
Teres Minor - Innervation | Axillary Nerve |
Teres Major - Origin | dorsal inferior angle of scapula |
Teres Major - Insertion | crest of lesser tubercle of humerus |
Teres Major - Action | extends and rotates arm medially (with latissimus dorsi) |
Teres Major - Innervation | Lower Subscapular Nerve |
Deltoid - Origin | inferior surface of lateral 1/3 of clavicle, acromion, inferior margin of spine of scapula |
Deltoid - Insertion | deltoid tuberousity of humerus |
Deltoid - action | abducts, extends, and flexes arm; assists in medial and lateral rotation |
Deltoid - Innervation | axillary nerve |
Supraspinatous - Origin | supraspinous fossa |
Supraspinatous - Insertion | upper facet of greater tubercle of humerus |
Supraspinatous - Action | initiates abduction, stabilizes shoulder joint (with other rotator cuff muscles), "resists" upper pull of deltoid |
Supraspinatous - Innervation | suprascapular nerve |
Infraspinatous - Origin | Infraspinous Fossa |
Infraspinatous - Insertion | middle facet of greater tubercle of humerus |
Infraspinatous - Action | Rotates arm laterally (with Teres minor) |
Infraspinatous - Innervation | suprascapular nerve |
Trapezius - Origin | EOP, superior nuchal line, ligamentum nuchae, spinous processes of C7 and all 12 thoracic spines |
Trapezius - Insertion | lateral 1/3 of clavicle, spine of scapula, acromion |
Trapezius - Action | adducts scapula, tilts chin forward, draws acromion backward, rotates scapula. |
Trapezius - Innervation | Spinal Accessory Nerve (CN XI) and C3 and C4 |
Levator Scapulae - Origin | transverse processes of C1-C4 |
Levator Scapulae - Insertion | vertebral border of scapula above root of spine |
Levator Scapulae - Action | elevates scapula, if scapula is fixed inclines neck |
Levator Scapulae - Innervation | Dorsal scapular nerve (mainly) and direct branches of C3 and C4 |
Biceps Brachii - Origin | short head: coracoid process of scapula; long head - supraglenoid tubercle of scapula |
Biceps Brachii - Insertion | radial tuberosity |
biceps brachii - Action | powerful flexor of forearm at elbow |
biceps brachii - Innervation | musculocutaneous nerve (C5 and C6) |
Coracobrachialis - Origin | coracoid process of scapula |
Coracobrachialis - Insertion | middle of medial surface and border of humerus |
Coracobrachialis - Action | flexes and adducts arm at the shoulder |
Coracobrachialis - Innervation | musculocutaneous nerve (C5 and C6) |
Brachialis - Origin | distal half of anterior humerus |
Brachialis - Insertion | tuberosity and anterior surface of coronoid process of ulna |
Brachialis - Action | powerful flexor of forearm at elbow |
Brachialis - Innervation | musculocutaneous nerve (C5 and C6); radial nerve sends a minor branch (C7) |
Triceps Brachii - Origin | long head: infraglenoid tubercle of scapula, lateral head: posterior surface of humerus, medial head: posterior surface of humerus inferior to radial groove |
Triceps Brachii - Insertion | olecranon process of ulna |
Triceps Brachii - Action | all 3 heads: extend forearm at elbow: long head extends humerus at shoulder joint |
Triceps Brachii - Innervation | Radial Nerve (C7, C8) |