scapulohumeral muscles Flashcards
Teres major O/INS/A/INN
Teres major is one of the scapulohumeral muscles not involved in the rotator cuff
Origin - posterior surface of the inferior angle of the scapula
Insertion - Medial lip of the bicipital groove
Action - Adduction and internal rotation of the humerus
Nerve supply - lower subscapular nerve
Deltoid O/INS/A/INN
Deltoid is one of the scapulohumeral muscles not involved in the rotator cuff. It has 3 parts anterior, middle and posterior
Origin - anterior: lateral 3rd of clavicle
middle: acromion
lateral: spine of the scapula
Insertion - Deltoid tuberosity
Action - Anterior part: flexion and internal rotation of humerus
Middle: Abduction of humerus
Posterior: Extension and external rotation of humerus
Nerve supply - Axillary nerve
Supraspinatus O/INS/A/INN
Supraspinatus is one of the scapulohumeral muscles involved in the rotator cuff. Most common muscle involved in ‘rotator cuff’ (impingement)
Origin - supraspinous fossa
Insertion - Superior facet of greater tubercle of humerus
Action - Abduction (the first 15 degrees), stabilises GH joint
Nerve supply - suprascapular nerve
Infraspinatus O/INS/A/INN
Infraspinatus is one of the scapulohumeral muscles involved in the rotator cuff.
Origin - infraspinous fossa of scapula
Insertion - middle facet of the greater tubercle of humerus
Action - external rotation of humerus, stabilises GH joint
Nerve supply - Suprascapular nerve
Teres minor
Teres minor is one of the scapulohumeral muscles involved in the rotator cuff. It forms the superior border of the quadrangular/ medial triangular space
Origin - lateral border of the scapula
Insertion - inferior facet of the greater tubercle of humerus
Action - external rotation of humerus, stabilises GH joint Nerve supply - Axillary nerve
Subscapularis O/INS/A/INN
Subscapularis is one of the scapulohumeral muscles involved in the rotator cuff.
Origin - subscapular fossa
Insertion - lesser tubercle of humerus
Action - internal rotation and
