Neck and Shoulder Muscles Origin Insertion and Innervation

Sternocleidomastoid Origin

lateral surface of mastoid process, lateral part of superior nuchal line

Sternocleidomastoid insertion

anterior surface of manubrium, superior medial portion of clavicle

Sternocleidomastoid innervation

Spinal accessory nerve (CN XI); C2 and C3 nerves

Pectoralis major origin

anterior surface of medial clavicle, anterior surface of sternum, costal cartilage 1-6, aponeurosis of external oblique muscle

pectoralis major insertion

lateral tip of intertubercular sulcus of humerus

pectoralis major innervation

lateral (C5-C6) and medial (C7-T1) pectoral nerves

pectoralis minor origin

ribs 3-5 near costal cartilages

pectoralis minor insertion

medial border and superior surface of coracoid process of clavicle

pectoralis minor innervation

medial (C8-T1) and lateral (C5-C6) pectoral nerve

serratus anterior origin

External surfaces of lateral parts of ribs 1-8

serratus anterior insertion

anterior surface of medial border of scapula

serratus anterior innervation

long thoracic nerve (C5-C7)

anterior scalene origin

anterior tubercules of transverse process of C3-C6

anterior scalene insertion

1st rib

anterior scalene innervation

cervical spinal nerves C4-C6

middle scalene origin

posterior tubercule of transverse process of C4-C7

middle scalene insertion

superior surface of first rib posterior to groove for subclavian artery

middle scalene innervation

anterior rami of cervical spinal nerves

posterior scalene origin

posterior tubercule of transverse process of C4-C6

posterior scalene insertion

external border of second rib

posterior scalene innervation

anterior rami of cervical spinal nerves C7-C8

deltoid origin

lateral third of clavicle, acromion, spine of scapula

deltoid insertion

deltoid tuberosity of humerus

deltoid innervation

axillary nerve (C5-C6)

supraspinatus origin

supraspinous fossa of scapula

supraspinatus insertion

superior facet of greater tubercle of humerus

supraspinatus innervation

suprascapular nerve (C4-C6)

infraspinatus origin

infraspinous fossa of scapula

infraspinatus insertion

middle facet of greater tubercle of humerus

infraspinatus innervation

suprascapular nerve (C5-C6)

teres minor origin

middle part of lateral border of scapula

teres minor insertion

inferior facet of greater tubercle of humerus

teres minor innervation

axillary nerve (C5-C6)

teres major origin

inferior portion of lateral border and posterior surface of inferior angle of scapula

teres major insertion

medial lip of intertubercular sulcus of humerus

teres major innervation

Lower subscapular nerve (C5, C6)

subscapularis origin

subscapular fossa

subscapularis insertion

lesser tubercle of humerus

subscapularis innervation

upper and lower subscapular nerve (C5-C7)