Muscle Origin Insertion Innervation Action Trapezius External occipital protuberance Upper fibres – lateral 1/3 clavicle CNXI – Spinal part of - Elevates the scapula Superior nuchal line Middle fibres – acromion Accessory nerve - Rotates the scapula during Ligamentum nuchae Lower fibres – spine of scapula aBDduction of the humerus above Spinous process of CVII-TXII horizontal - Middle fibres retract scapula - Lower fibres depress scapula Latissimus Dorsi T6-T12 Bicipital groove (intertubercular Thoracodorsal nerve Extends, aDDucts and medially Iliac Crest sulcus) of the humerus C6, C7, C8 rotates the upper limb Thoracolumbar fascia Inferior 3 ribs Levator Scapuli Superioris C1-C4 transverse processes Medial border of the scapula Dorsal scapular nerve Elevates the scapula (branch of the brachial plexus) Rhomboid Major (inferior) T2-T5 vertebrae Posterior surface of medial Dorsal scapular nerve Elevates and retracts the scapula border of scapula (C4, C5) C7-T1 Posterior surface of medial Dorsal scapular nerve Elevates and retracts the scapula Rhomboid Minor (superior) border of scapula (C4,C5) Rotator cuff muscles Name Meaning Origin Insertion Nerve Supply Action Supraspinatus Above spine of scapula Medial 2/3rd of Capsule of shoulder joint Suprascapular nerve aBDuction of arm at supraspinous fossa + (C5, C6) glenohumeral joint Greater tubercule of the humerus
Muscle Origin Insertion Innervation Action Trapezius External occipital protuberance Superior nuchal line Ligamentum nuchae Spinous process of CVII-TXII Upper fibres – lateral 1/3 clavicle Middle fibres – acromion Lower fibres – spine of scapula CNXI – Spinal part of Accessory nerve - Elevates the scapula - Rotates the scapula during aBDduction of the humerus above horizontal - Middle fibres retract scapula - Lower fibres depress scapula Latissimus Dorsi T6-T12 Iliac Crest Thoracolumbar fascia Inferior 3 ribs Bicipital groove (intertubercular sulcus) of the humerus Thoracodorsal nerve C6, C7, C8 Extends, aDDucts and medially rotates the upper limb Levator Scapuli Superioris C1-C4 transverse processes Medial border of the scapula Dorsal scapular nerve (branch of the brachial plexus) Elevates the scapula Rhomboid Major (inferior) Rhomboid Minor (superior) T2-T5 vertebrae Posterior surface of medial border of scapula Dorsal scapular nerve (C4, C5) Elevates and retracts the scapula C7-T1 Posterior surface of medial border of scapula Dorsal scapular nerve (C4,C5) Elevates and retracts the scapula Rotator cuff muscles Name Meaning Origin Insertion Nerve Supply Action Supraspinatus Above spine of scapula Medial 2/3rd of supraspinous fossa Capsule of shoulder joint + Greater tubercule of the humerus Suprascapular nerve (C5, C6) aBDuction of arm at glenohumeral joint
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