UE: Shoulder Region OIAN's

Pectoralis Major Origin:

• Clavicular Head: Medial ½ of anterior surface of clavicle

• Sternocostal Head: Anterior surface of sternum, adjacent ribs 1-6, and aponeurosis of external abdominal obliques

Pectoralis Major Insertion:

shared tendon to the lateral lip of the intertubercular groove of humerus

Pectoralis Major Action:

• Both Heads: Adduction and Medial Rotation of humerus

• Clavicular Head ONLY: Flexion

• Sternocostal Head ONLY: Extension

Pectoralis Major Innervation:

• Clavicular Head: Lateral Pectoral Nerve; C5, C6

• Sternocostal Head: Medial pectoral Nerve; C7, C8, T1

Pectoralis Minor Origin:

Anterior surface of ribs 3-5 near their costal cartilages

Pectoralis minor Insertion:

medial border and superior surface of coracoid process of scapula

Pectoralis Minor Action:

Stabilization and asst. protraction of scapula

Pectoralis Minor Innervation:

Medial Pectoral N C8, T1

Subclavius Origin:

Junction of 1st rib and its costal cartilage

Subclavius Insertion:

middle 1/3 of inferior surface of clavicle

Subclavius Action:

draw clavicle medially

Subclavius Innervation:

Nerve to subclavius C5, C6

Serratus Anterior Origin:

External surface of ribs 1-9 and fascia of external intercostal muscles

Serratus Anterior Insertion:

Anterior surface medial border of scapula

Serratus Anterior Action:

Protraction and stabilization of scapula, superiorly rotates scapula

Serratus Anterior Innervation:

Long Thoracic Nerve C5, C6, C7

Trapezius Origin:

Medial 1/3 of superior nuchal line, external occipital protuberance, ligamentum nuchae SP’s of C7-T12, and lumbar and sacral spinous process via the thoracolumbar fascia

Trapezius Insertion:

lateral 1/3 of clavicle, the acromion and spine of scapula

Trapezius Action:

Retract, Elevate, Depress, and superiorly rotate the scapula

Trapezius Innervation:

CN XI or Accessory N and the Ventral Rami of the Cervical Nerve C3,C4

Latissimus Dorsi Origin:

SP’s of T6-T12, ribs 9-12, thoracolumbar fascia, and iliac crest

Latissimus Dorsi Insertion:

floor of the intertubercular groove of humerus

Latissimus Dorsi Action:

Extension, medial rotation, and adduction of humerus; raises body to arms when climbing

Latissimus Dorsi Innervation:

Thoracodorsal Nerve C6, C7, C8

Levator Scapulae Origin:

posterior tubercles of the TP’s of C1-C4 vertebrae

Levator Scapulae Insertion:

superior part of the medial border of the scapula

Levator Scapulae Action:

elevates and inferiorly rotates scapula

Levator Scapulae Innervation:

Dorsal scapular Nerve C5, and cervical N. C3, C4

Rhomboids (major and Minor) Origin:

• Minor: ligamentum nuchae and SP of C7-T1

• Major: SP of T2-T5

Rhomboids Insertion:

medial border of scapula from level of scapula spine to inferior angle

Rhomboids action:

Retraction, elevation, inferior rotation, and stabilization of scapula to thoracic wall

Rhomboids Innervation:

Dorsal Scapular N. C4,C5

Deltoid Origin:

Lateral 1/3 of clavicle, acromion and spine of scapula

Deltoid Insertion:

deltoid tuberosity of humerus

Deltoid Action:

• Ant Fibers: medially rotate, flex and ABD

• Middle fibers: ABDuction

• Posterior Fibers: laterally rotate, Ext, and ABD

Deltoid Innervation:

Axillary N C5, C6

Supraspinatus Origin:

supraspinous fossa of scapula

Supraspinatus Insertion:

superior facet of greater tubercle of humerus

Supraspinatus Action:

help with first degrees of ABD, stabilize head of humerus in glenoid cavity

Supraspinatus Innervation:

Suprascapular N C4,C5,C6

Infraspinatus Origin:

infraspinous fossa of scapula

Infraspinatus Insertion:

middle facet of greater tubercle of humerus

Infraspinous action:

lateral rotation (primary mover) and stabilize head of humerus in glenoid cavity

Infraspinatus Innervation:

Suprascapular N C5, C6

Teres Minor Origin:

superior part of lateral border of scapula

Teres Minor Insertion:

inferior facet of greater tubercle of humerus

Teres Minor Action:

Lateral rotation (primary mover) and stabilize head of humerus in glenoid cavity

Teres Minor Innervation:

Axillary N. C5,C6

Teres Major Origin:

dorsal surface of inferior angle of scapula

Teres Major Insertion:

medial lip of intertubercular groove of humerus

Teres Major Action

medial rotation and adduction of humerus

Teres major Innervation:

lower subscapular N. C5, C6

Subscapularis Origin:

subscapular fossa of scapula

Subscapularis Insertion:

lesser tubercle of humerus

Subscapularis Action:

Internal rotation and adduction of humerus; stabilize head of humerus in glenoid cavity

Subscapularis Innervation:

upper and lower subscapular Nerves C5, C6, C7