Moore Upper Extremity Muscles

Proximal Attachment - Clavicular head: anterior surface of medial half of clavicle Sternocostal head: anterior surface of sternum, superior six costal cartilages, aponeurosis of external oblique muscle
Distal Attachment- Lateral lip of intertubercular sulcus of humerus

Innervation- Lateral and medial pectoral nerves; clavicular head (C5, C6), sternocostal head (C7, C8, T1)
Main Action- Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly
Acting alone, clavicular head flexes humerus and sternocostal head extends it from the flexed position

3rd-5th ribs near their costal cartilages
Medial border and superior surface of coracoid process of scapula
Medial pectoral nerve (C8, T1)
Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall

Junction of 1st rib and its costal cartilage
Inferior surface of middle third of clavicle
Nerve to subclavius (C5, C6)
Anchors and depresses clavicle

External surfaces of lateral parts of 1st-8th ribs
Anterior surface of medial border of scapula
Long thoracic nerve (C5, C6, C7)
Protracts scapula and holds it against thoracic wall; rotates scapula

Medial third of superior nuchal line; external occipital protuberance; nuchal ligament; spinous processes of C7-T12 vertebrae
Lateral third of clavicle; acromion and spine of scapula
Spinal accessory nerve (CN XI) (motor fibers) and C3, C4 spinal nerves (pain and proprioceptive fibers)
Descending part elevates; ascending part depresses; and middle part (or all parts together) retracts scapula; descending and ascending parts act together to rotate glenoid cavity superiorly

Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs
Floor of intertubercular sulcus of humerus
Thoracodorsal nerve (C6, C7, C8)
Extends, adducts, and medially rotates humerus; raises body toward arms during climbing

Posterior tubercles of transverse processes of C1-C4 vertebrae
Medial border of scapula superior to root of scapular spine
Dorsal scapular (C5) and cervical (C3, C4) nerves
Elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula

Nuchal ligament; spinous processes of C7 and T1 vertebrae

smooth triangular area at medial end of scapular spine

Dorsal scapular nerve (C4, C5)
Retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall

Spinous processes of T2-T5 vertebrae

medial border of scapula from level of spine to inferior angle

Dorsal scapular nerve (C4, C5)
Retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall

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

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^b

Infraspinous fossa of scapula
Middle facet of greater tubercle of humerus
Suprascapular nerve (C5, C6)
Laterally rotates arm; and acts with rotator cuff muscles

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

Posterior surface of inferior angle of scapula
Medial lip of intertubercular sulcus of humerus
Lower subscapular nerve (C5, C6)
Adducts and medially rotates arm

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