OIAN

C8

T1 Pectoralis Minor Action Depresses , abducts , downward rotates S / T joint Subclavius Origin Junction of 1st rib and its costal cartilage Subclavius Insertion Inferior surface of middle 3rd of clavicle Subclavius Innervation Nerve to subclavius C5 , C6 Subclavius Action Depresses clavicle Elevates 1st rib Stabilizes SC joint Serratus Anterior Origin External surface of ribs 1-8 ribs Serratus Anterior Insertion Anterior surface of medial border of scapula Serratus Anterior Innervation Long thoracic n

C5-7 Serratus Anterior Action Elevates thorax in inhalation Abducts , upwardly rotates depresses scapula Holds medial border of scapula to ribcage Trapezius Insertion Lateral 3rd of clavicle ; acromion and spine of scapula Origin Trapezius Medial 3rd of superior nuchal line External occipital protuberance Nuchal ligament Spinous processes of C7

T12 vertebrae Trapezius Innervation Spinal accessory n

C4

C6 Supraspinatus Action Abducts the GH joint Initiates and assist the deltoid in abduction Stabilizes head of humerus within the glenoid fossa Infraspinatus Origin Infraspinous fossa of scapula Infraspinatus Insertion Middle facet of greater tubercle humerus Infraspinatus Innervation Suprascapular n

C6

C7 Coracobrachialis Action Flexes and adducts GH jt

Pectoralis Major Origin

Clavicular head : Medial ½ of clavicle
Sternal head : Sternum
Costal head : Cartilage of ribs 1-6 , and aponeurosis of external oblique muscle

Pectoralis Major Insertion

Lateral lip of intertubercular sulcus of humerus

Pectoralis Major Innervation

Medial and lateral pectoral nn .
Clavicular head : C5 , C6 and
sternocostal head : C7 - T1

Pectoralis Major Action

(All ) Adducts & medially rotates the GH joint
(Clavicular ) Flexes & horizontally adducts GH joint
(Costal) Extends GH joint

Pectoralis Minor Origin

3rd - 5th ribs

Pectoralis Minor Insertion

Medial border and superior surface of the coracoid process scapula

Pectoralis Minor Innervation

Medial pectoral n . C8 - T1

Pectoralis Minor Action

Depresses , abducts , downward rotates S / T joint

Subclavius Origin

Junction of 1st rib and its costal cartilage

Subclavius Insertion

Inferior surface of middle 3rd of clavicle

Subclavius Innervation

Nerve to subclavius C5 , C6

Subclavius Action

Depresses clavicle
Elevates 1st rib
Stabilizes SC joint

Serratus Anterior Origin

External surface of ribs 1-8 ribs

Serratus Anterior Insertion

Anterior surface of medial border of scapula

Serratus Anterior Innervation

Long thoracic n . C5-7

Serratus Anterior Action

Elevates thorax in inhalation
Abducts , upwardly rotates depresses scapula
Holds medial border of scapula to ribcage

Trapezius Insertion

Lateral 3rd of clavicle ; acromion and spine of scapula

Origin Trapezius

Medial 3rd of superior nuchal line
External occipital protuberance
Nuchal ligament
Spinous processes of C7 - T12 vertebrae

Trapezius Innervation

Spinal accessory n . CXI

Trapezius Action

Extend , laterally flex , rotate head and neck contralaterally
Elevate , upwardly rotate , adducts , and depress the scapula

Latissimus Dorsi Origin

Spinous processes of inferior 6 thoracic vertebrae , thoracolumbar fascia , iliac crest and inferior 3 or 4 ribs

Latissimus Dorsi Insertion

Floor of intertubercular sulcus of humerus

Latissimus Dorsi Innervation

I Thoracodorsal n . C6 - C8

Latissimus Dorsi Action

Extends , adducts , and medially rotates humerus

Origin Levator Scapulae

Transverse processes of C1 - C4 vertebrae

Levator Scapulae Insertion

Medial border of scapula superior to root of scapular spine

Levator Scapulae Innervation

Dorsal scapular n . C4 , C5 and spinal nerves C3 , C4

Levator Scapulae Action

Elevates and downwardly rotates scapula Laterally flex and extend the head and neck Rotates head ipsilaterally

Rhomboid Major and Minor Origin

Major : spinous processes of T2 - T5
Minor : spinous processes C7 , T1

Rhomboid Major and Minor Insertion

Major : medial border of scapula
Minor : Upper portion of medial border

Rhomboid Major and Minor Innervation

Dorsal scapular n . C4 , C5

Rhomboid Major and Minor Action

Adduct , elevates , downwardly rotates scapula

Deltoid Origin

Lateral 3rd of clavicle ; acromion and spine of scapula

Deltoid Insertion

Deltoid tuberosity of humerus

Deltoid Innervation

Axillary n . C5 , C6

Deltoid Action

( All heads ) Abducts the GH joint
( Clavicular head ) Flexes , medially rotates , horizontally adducts GH joint
( Spinal head ) Extends , laterally rotates , horizontally abducts GH joint

Teres Major Origin

Inferior angle of scapula Lower 1/3 of the lateral border of the scapula

Teres Major Insertion

Medial lip of intertubercular sulcus of humerus

Teres Major Innervation

Lower subscapular n . C5 , C6

Teres Major Action

Extends , adducts , and medially rotates the GH joint

Supraspinatus Origin

Supraspinous fossa of scapula

Supraspinatus Insertion

Superior facet of Greater tubercle of humerus

Supraspinatus Innervation

Suprascapular n . C4 - C6

Supraspinatus Action

Abducts the GH joint Initiates and assist the deltoid in abduction Stabilizes head of humerus within the glenoid fossa

Infraspinatus Origin

Infraspinous fossa of scapula

Infraspinatus Insertion

Middle facet of greater tubercle humerus

Infraspinatus Innervation

Suprascapular n . C5 , C6

Infraspinatus Action

Laterally rotates and adducts the GH joint Stabilizes head of humerus within the glenoid fossa

Teres Minor Origin

Middle part of lateral border of scapula

Teres Minor Insertion

Inferior facet of greater tubercle of humerus

Teres Minor Innervation

Axillary n . C5 , C6

Teres Minor Action

Laterally rotates and adducts the GH joint Stabilizes head of humerus within the glenoid fossa

Subscapularis Origin

Subscapular fossa

Subscapularis Insertion

Lesser tubercle of humerus

Subscapularis Innervation

Upper and lower subscapular nn . C5 - C7

Subscapularis Action

Medially rotate the GH joint Stabilizes head of humerus within the glenoid fossa

Biceps Brachii Origin

Short head : coracoid process of scapula
Long head : supraglenoid tubercle of scapula

Biceps Brachii Insertion

Radial tuberosity via bicipital aponeurosis / tendon

Biceps Brachii Innervation

Musculocutaneous n . C5-6 ( C7 )

Biceps Brachii Action

Flexes GH jt . Flexes elbow Supinates forearm .

Brachialis Origin

Distal ½ of anterior surface of humerus

Brachialis Insertion

Ulnar tuberosity • Coronoid process of ulna

Brachialis Innervation

Musculocutaneous n . C5-6 ● • Radial n . C5 - C7

Brachialis Action

Flexes elbow

Coracobrachialis Origin

Coracoid process of scapula

Coracobrachialis Insertion

Medial surface of mid - humeral shaft

Coracobrachialis Innervation

Musculocutaneous n . C6 - C7

Coracobrachialis Action

Flexes and adducts GH jt .

Triceps Brachii Origin

Long head : infraglenoid tubercle of scapula
Medial head : posterior surface of distal humerus
Lateral head : posterior surface of proximal humerus

Triceps Brachii Insertion

Olecranon process of the ulna

Triceps Brachii Innervation

Radial n . C6-8 , T1

Triceps Brachii Action

Extends and adducts GH jt . extends elbow

Anconeus Origin

Lateral epicondyle of humerus

Anconeus Insertion

Olecranon process of ulna • Posterior , proximal surface of ulna

Anconeus Innervation

Radial n . C7 , C8

Anconeus Action

Extends elbow