(most superior facet) Infraspinatus Below spine of scapula Medial 2/3rd of Greater tubercle of the Suprascapular nerve Lateral rotation at infraspinous fossa humerus (C5,C6) glenohumeral joint (Lower down than supraspinatous) Teres Minor Minor rounded muscle Lateral border of the Capsule of shoulder joint Axillary Nerve Lateral rotation at *under scapula + (C5,C6) glenohumeral joint the lower border of the teres minor, the axillary nerve Greater tubercle of the supplies: leaves the axilla to enter the deltoid humerus posterior compartment which teres minor (Below insertion of the infraspinatus) lies across the posterior surface long head of triceps brachii of the humerus. Subscapularis Muscle below the Subscapular fossa Lesser tubercle of humerus Upper and lower Medial rotation of scapula subscapular nerves arm at the (C5, C6, (C7)) glenohumeral joint Name Origin Insertion Nerve supply Action Deltoid muscle Clavicle Deltoid tuberosity of the Axillary nerve Anterior fibres (anterior, middle and posterior) Acromion humerus Flex arm at the shoulder (bony process of the scapula) Spine of scapula Middle fibres
(most superior facet) Infraspinatus Below spine of scapula Medial 2/3rd of infraspinous fossa Greater tubercle of the humerus (Lower down than supraspinatous) Suprascapular nerve (C5,C6) Lateral rotation at glenohumeral joint Teres Minor *under the lower border of the teres minor, the axillary nerve leaves the axilla to enter the posterior compartment which lies across the posterior surface of the humerus. Minor rounded muscle Lateral border of the scapula Capsule of shoulder joint + Greater tubercle of the humerus (Below insertion of the infraspinatus) Axillary Nerve (C5,C6) supplies: deltoid teres minor long head of triceps brachii Lateral rotation at glenohumeral joint Subscapularis Muscle below the scapula Subscapular fossa Lesser tubercle of humerus Upper and lower subscapular nerves (C5, C6, (C7)) Medial rotation of arm at the glenohumeral joint Name Origin Insertion Nerve supply Action Deltoid muscle (anterior, middle and posterior) Clavicle Acromion (bony process of the scapula) Spine of scapula Deltoid tuberosity of the humerus Axillary nerve Anterior fibres Flex arm at the shoulder Middle fibres
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