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UE Muscles

origin, insertion, innervation, action

TermDefinition
Supraspinatus Origin: Supraspinous Fossa Insertion: Greater Tubercle of Humerus Innervation: Suprascapular Nerve Action: Initiates 15 degrees of abduction
Infraspinatus Origin: Infraspinous Fossa Insertion: Greater Tubercle Innervation: Suprascapular Nerve Action: Medial rotation of arm
Teres Minor Origin: Infraspinous Fossa Insertion: Greater tubercle of humerus Innervation: Axillary Nerve Action: Medial rotation of arm
Subscapularis Origin: Subscapular Fossa Insertion: Lesser tubercle of humerus Innervation: Upper and lower subscapular nerves Action: Medial rotation of scapula
Teres Major Origin: Inferior angle of scapula Insertion: Bicipital groove Action: Medial rotation and adduction of arm Innervation: Lower subscapular nerve
Deltoids Origin: spine of scapula and clavicle Insertion: Deltoid tuberosity Innervation: Axillary Nrve Action: arm abduction, medial/lateral rotation, extension/flexion
Levator Scapulae Origin: T processes of C1-C4 Insertion: Superior angle of scapula Action: Elevates scapula Innervation: Dorsal scapular nerve
Rhomboid Minor Origin: S processes of C7-T1 Insertion: Medial border of scapula Action: Retraction of Scapula Innervation: Dorsal scapular nerve
Rhomboid Major Origin: S processes of T2-T5 Insertion: Medial border of scapula Action: retraction of Scapula Innervation: Dorsal scapular nerve
Trapezius Origin: external occipital protruberance, S processes of C2-T12, ligamentum nuchae Insertion: clavicle and spine of scapula Action: elevation and retraction of scapula Innervation: Spinal Accessory nerve
Latissimus Dorsi Origin: S processes of T6-L5 Insertion: Bicipital groove Action: arm extension, adduction, medial rotation Innervation: thoracodorsal nerve
Pectoralis Major Origin: sternum, clavicle, lower ribs Insertion: Bicipital Groove Action: arm adduction, flexion, medial rotation Innervation: medial and lateral pectoral nerves
Pectoralis Minor Origin: Ribs 5, 6, 7 Insertion: Coracoid process of scapula Action: depresses and stabilizes scapula Innervation: Medial pectoral nerve
Serratus Anterior Origin: outer surface of 8 upper ribs Insertion: medial border of scapula Action: protraction and upward rotation of scapula Innervation: long thoracic nerve
Created by: matanp