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Muscles

Upper Limb

QuestionAnswer
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.
Created by: togini
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