MSS Wk 7 Summary Muscle Tables.pptx

Muscle Summary Muscle Table: Scapula movements Action Innervation Origin and Insertion Pectoralis Minor Scapula protraction, depression and medial rotation Medial pectoral nerve O: anterior surface of ribs 3-5 I: coracoid Serratus anterior Scapula protraction, lateral rotation and keeps sca...

Muscle Summary Muscle Table: Scapula movements Action Innervation Origin and Insertion Pectoralis Minor Scapula protraction, depression and medial rotation Medial pectoral nerve O: anterior surface of ribs 3-5 I: coracoid Serratus anterior Scapula protraction, lateral rotation and keeps scapula against thoracic wall Long thoracic nerve O: lateral surfaces of ribs 1-8/9 I: medial border of scapula Trapezius Scapula elevation, lateral rotation, retraction and depression Accessory nerve (motor) and anterior rami of C3 and C4 (sensory) O: nuchal line and external occipital protuberance of occipital bone; ligamentum nuchae; C7-T12 spinous processes I: scapula spine, acromion and lateral clavicle Levator scapulae Scapula elevation Dorsal scapular nerve and anterior rami from C3 and C4 O: C1-4 transverse processes I: scapula superior angle Rhomboid minor Scapula retraction and elevation Dorsal scapular nerve O: C7-T1 spinous processes I: medial border of scapula Rhomboid major Scapula retraction and elevation Dorsal scapular nerve O: T2-T5 spinous processes I: medial border of scapula Muscle Summary Muscle Table: GH jt movements Action Innervation Origin and Insertion Deltoid Abductor of GH joint, Posterior fibers help GH extension, Anterior fibers help GH flexion Axillary nerve O: scapular spine, acromion and lateral clavicle I: deltoid tuberosity of humerus Pectoralis major Flexion, adduction and medial rotation of GH joint (Sternocostal head can assist in extension of GH jt) Medial and lateral pectoral nerves O: Medial clavicle, sternum and costal cartilages 1-7 I: Intertubercular sulcus of humerus Biceps brachii Flexor of forearm (elbow) Supinator of forearm Accessory flexor of GH joint Musculocutaneous nerve O: long hd: supraglenoid tubercle of scapula; short hd: apex of coracoid process I: tuberosity of radius (and bicipital aponeurosis) Coracobrachialis Flexor and adductor of the GH joint; Musculocutaneous nerve O: coracoid process I: midshaft of humerus on medial side Teres major Extension and medial rotation of GH joint Inferior (a.k.a. lower) subscapular nerve O: inferior angle of scapula I: Intertubercular sulcus of humerus Latissimus dorsi Adduction, medial rotation and extension of the GH joint Thoracodorsal nerve O: T7-12 spinous processes, iliac crest, lower 3-4 ribs I: Intertubercular sulcus of humerus Summary Muscle Table: GH jt movements Muscle Action Innervation Origin and Insertion Triceps brachii (long head) Forearm extension at the elbow Accessory adductor and extensor of the GH joint Radial nerve O: infraglenoid tubercle of scapula I: olecranon process of the ulna Supraspinatus Rotator cuff muscle (GH joint stabiliser); Initiates GH abduction (first 15˚) Suprascapular nerve O: supraspinous fossa of scapula I: greater tubercle of humerus Infraspinatus Rotator cuff muscle (GH joint stabiliser); Lateral rotation of GH joint Suprascapular nerve O: infraspinous fossa of posterior scapula I: greater tubercle of humerus Teres minor Rotator cuff muscle (GH joint stabiliser); Lateral rotation of GH joint Axillary nerve O: lateral border of scapula I: greater tubercle of humerus Subscapularis Rotator cuff muscle (GH joint stabiliser); Medial rotation of GH joint Upper and lower subscapular nerves O: subscapular fossa of anterior scapula I: lesser tubercle of humerus