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KN 251 Week 11 Muscl

Shoulder muscles, rotator cuff, and arm muscles

TermDefinition
Rhomboid Major Action: Scapular retraction Innervation: Dorsal scapular (C5) Origin: Spines of T2-T5 Insertion: Medial border of scapula Shoulder
Rhomboid Minor Action: Scapular retraction Innervation: Dorsal scapular (C5) Origin: Spines of C7-T1 Insertion: Medial border of scapula Shoulder
Teres Major Action: Extends, medially rotates, adducts arm Innervation: Lower subscapular Origin: Inferior angle of scapula Insertion: Intertubercular sulcus of humerus Shoulder
Coracobrachialis Action: Flexes and adducts the arm Innervation: Musculocutaneous Origin: Coracoid process Insertion: Medial diaphysis of humerus Arm-Anterior
Brachialis Action: Flexes forearm Innervation: Musculocutaneous Origin: Distal half of diaphysis of anterior humerus Insertion: Coronoid process of ulna Arm-Anterior
Triceps Brachii Action: Extends forearm and extends arm at shoulder joint Innervation: Radial Origin: Long head-infraglenoid tubercle, lateral head-posterior, proximal diaphysis of humerus, medial head-posterior diaphysis of humerus Insertion: Olecranon process Arm
Trapezius Action: Scapular retraction, rotates, elevates, and depresses scapula Innervation: Spinal Accessory (CN XI) Origin: External occipital protuberance, ligamentum nunchae, spines of C7-T12 Insertion: Scapular spine, acromion, lateral 1/3 clavicle Shoul
Latissimus Dorsi Action: Adducts, extends the arm, rotates arm medially, and depresses scapula Innervation: Thoracodorsal Origin: Iliac crest, spinous process of T7-T12, ribs 9-12 Insertion: Intertubercular sulcus of humerus Shoulder
Levator Scapulae Action: Elevates and downward rotation of scapula Innervation: Dorsal scapular (C5) Origin: Transverse process of C1-C4 Insertion: Superior angle of scapula Shoulder
Deltoid Action: Abducts, flexes, extends the arm. Rotates arm medially, and laterally Innervation: Axillary Origin: Acromion process, lateral 1/3 of clavicle spine of scapula Insertion: Deltoid tuberosity of humerus Shoulder
Pectoralis Major Action: Flexes and horizontal adducts the arm, rotates arm medially Innervation: Medial and lateral pectoral Origin: Medial clavicle sternum, costal cartilages 1-6 Insertion: Greater tubercle and lateral lip of intertubercular sulcus of humerus Shou
Pectoralis Minor Action: Depresses scapula and elevates ribs Innervation: Medial pectoral Origin: Anterior part of ribs 3-5 Insertion: Coracoid process Shoulder
Subscapularis Action: Rotates arm medially Innervation: Upper and lower subscapular Origin: Subscapular fossa of scapula Insertion: Lesser tubercle of humerus Rotator Cuff
Supraspinatus Action: Initiates abduction of arm Innervation: Suprascapular Origin: Supraspinous fossa of scapula Insertion: Greater tubercle of humerus Rotator Cuff
Infraspinatus Action: Rotates arm laterally Innervation: Suprascapular Origin: Infraspinous fossa of scapula Insertion: Greater tubercle of humerus Rotator Cuff
Teres Minor Action: Rotates arm laterally Innervation: Axillary Origin: Superolateral border of scapula Insertion: Greater tubercle of humerus Rotator Cuff
Biceps Brachii Action: Flexes arm and forearm, supinates forearm Innervation: Musculotaneous Origin: Long head-supraglenoid tubercle, Short head-coracoid process Insertion: Radial tuberosity of radius Arm-Anterior
Created by: mprez2
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