Question | Answer |
Insertion, Nerves and Action of Pectoralis Major | Lateral lip of the intertubercular sulcus (groove) of humerus; Lateral and medial Pectoral Nerves (Clavicle head C5, C6 and Sternal head C7, C8, T1; Flexes, adducts, and medially rotates humerus and draws scapula anteriorly and and inferiorly. |
Insertion, Nerves an Action (INA) of Pectoralis Minor | Coracoid process of scapula; Medial (lateral)pectoral nerves (C8, T1); Depresses scapula and elevates ribs. |
INA of the Subclavius muscle | Inferior surface of clavicle; subclavian nerve (C5, C6); Anchors and depresses clavicle. |
INA of the Serratus Anterior Muscle | Medial border of Scapula; Long thoracic (C5,C6,C7) Protracts and rotates scapula upward; Abducts scapula with arm and elevates it above horizonal . |
What are the muscle of the Pectoral and Axilla regions | Pec Minor, Pec Major, subclavius and Serratus Anterior. |
What are the muscles of the shoulder | Deltoid, Supraspinatus, Infraspinatus, Subscapularis, Teres Major and Minor and lattissimus Dorsi. |
INA of Deltoid Muscle | Deltoid tuberosity of humerus; Axillary Nerve (C5, C6); Abducts, adducts, flexes, extends, and rotates arm medially and laterally. |
INA of Supraspinatus Muscle | Superior facet of greater tubercle of humerus; Suprascapular (C4, C5, C6); Initiates and assists deltoid with abduction of arm and acts with other rotator cuff muscles. |
INA of Infraspinatus Muscle | Middle facet of greater tubercle of humerus; Suprascapular nerve (C5, C6); Laterally rotates arm; hold humeral head in glenoid cavity of scapula |
INA of Teres minor muscle | Inferior facet of greater tuberosity of humerus; Axillary nerve (C5, C6); Laterally rotates arm; help hold humeral head in glenoid cavity of scapula. |
INA of Teres Major muscle | Medial lip of intertubercular groove of humerus; Lower subscapular nerve (C5, C6); Adducts and medially rotates arm. |
INA of Subscapularis muscle | Lesser tubercle of humerus; Upper and Lower subscapular nerves (C5, C6, C7); Medially rotates and adducts arm; helps hold humeral head in glenoid cavity. |
What are SITS muscles | Supraspinatus, Infraspinatus, Teres minor and Subscapularis muscles. Rotator cuff muscles which form a cuff around glenohumeral joint. |
Superficial posterior axioappendicular muscles | Trapezius and Latissmus |
Deep posterior axioappendicular muscles | Levator Scapula ad Rhomboids major and Minor. |
INA of Trapezius | Lateral third of Clavicle; Spinal accessory nerve (motor fibres) and C3, C4 (pain and proprioceptive fibres); Elevates, depresses and retracts scapula; and rotate glenoid cavity superiorly. |
INA of Latissimus Dorsi | Floor of intertubercular sulcus (groove) of humerus; Thoracodorsal nerve (C6, C7, C8); Extends, adducts, and medially rotates humerus; raises body toward arms during climbing. |
INA of Levator scapula | Medial border of scapula and superior root of spine; Dorsal scapular (C5) and cervical (C3, C4) nerves; Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula. |
INA of Rhomboid minor and major | Minor: triangular area at medial end of scapular spine; Major: medial border of scapula from level of spine to inferior angle; Dorsal scapular nerve (C4, C5); retracts scapula and rotate it to depress glenoid cavity and fix scapula to thoracic wall. |