Muscle | Proximal attachment | Distal attachment | Innervation* | Main action |
Deltoid | Lateral third of clavicle; acromion and spine of scapula | Deltoid tuberosity of humerus | Axillary nerve (C5, C6) | Clavicular (anterior) part: flexes and medially rotates arm Acromial (middle) part: abducts arm Spinal (posterior) part: extends and laterally rotates arm |
Supraspinatus¶ | Supraspinous fossa of scapula | Superior facet of greater tubercle of humerus | Suprascapular nerve (C4, C5, C6) | Initiates and assists deltoid in abduction of arm and acts with rotator cuff muscles¶ |
Infraspinatus¶ | Infraspinous fossa of scapula | Middle facet of greater tubercle of humerus | Suprascapular nerve (C5, C6) | Laterally rotates arm; and acts with rotator cuff muscles¶ |
Teres minor¶ | Middle part of lateral border of scapula | Inferior facet of greater tubercle of humerus | Axillary nerve (C5, C6) | Laterally rotates arm; and acts with rotator cuff muscles¶ |
Teres major | Posterior surface of inferior angle of scapula | Medial lip of intertubercular sulcus of humerus | Lower subscapular nerve (C5, C6) | Adducts and medially rotates arm |
Subscapularis¶ | Subscapular fossa (most of anterior surface of scapula) | Lesser tubercle of humerus | Upper and lower subscapular nerves (C5, C6, C7) | Medially rotates arm; as part of rotator cuff, helps hold head of humerus in glenoid cavity |
Do you want to add Medilib to your home screen?