Muscles of the Shoulder Girdle (MOINA) (copy)

Clavicle, sternum, and upper six costal cartilages

Pectoralis major origin

Lateral lip of bicipital groove of humerus

Pectoralis major insertion

Medial and lateral pectoral nerves from brachial plexus

Pectoralis major nerve

Adducts arm and rotates it medially; clavicular fibers also flex arm

Pectoralis major action

Third, fourth, and fifth ribs

Pectoralis minor origin

Coracoid process of scapula

Pectoralis minor insertion

Medial pectoral nerve from brachial plexus

Pectoralis minor nerve

Depresses point of shoulder; if the scapula is fixed, it elevates the ribs of origin

Pectoralis minor action

First costal cartilage

Subclavius origin

Clavicle

Subclavius insertion

Nerve to subclavius from upper trunk of brachial plexus

Subclavius nerve

Depresses the clavicle and steadies this bone during movements of the shoulder girdle

Subclavius action

Upper eight ribs

Serratus anterior origin

Medial border and inferior angle of scapula

Serratus anterior insertion

Long thoracic nerve

Serratus anterior nerve

Draws the scapula forward around the thoracic wall; rotates scapula

Serratus anterior action

Occipital bone, ligamentum nuchae, spine of seventh cervical vertebra, spines of all thoracic vertebrae

Trapezius origin

Upper fibers into lateral third of clavicle; middle and lower fibers into acromion and spine of scapula

Trapezius insertion

Spinal part of accessory nerve (motor) and C3 and 4 (sensory)

Trapezius nerve

Upper fibers elevate the scapula; middle fibers pull scapula medially; lower fibers pull medial border of scapula downward

Trapezius action

Iliac crest, lumbar fascia, spines of lower six thoracic vertebrae, lower three or four ribs, and inferior angle of scapula

Latissimus dorsi origin

Floor of bicipital groove of humerus

Latissimus dorsi insertion

Thoracodorsal nerve

Latissimus dorsi nerve

Extends, adducts, and medially rotates the arm

Latissimus dorsi action

Transverse processes of first four cervical vertebrae

Levator scapulae origin

Medial border of scapula

Levator scapulae insertion

C3 and 4 and dorsal scapular nerve

Levator scapulae nerve

Raises medial border of scapula

Levator scapulae action

Ligamentum nuchae and spines of seventh cervical and first thoracic vertebrae

Rhomboid minor origin

Medial border of scapula

Rhomboid minor insertion

Dorsal scapular nerve

Rhomboid minor nerve

Raises medial border of scapula upward and medially

Rhomboid minor action

Second to fifth thoracic spines

Rhomboid major origin

Medial border of scapula

Rhomboid major insertion

Dorsal scapular nerve

Rhomboid major nerve

Raises medial border of scapula upward and medially

Rhomboid major action

Lateral third of clavicle, acromion, spine of scapula

Deltoid origin

Middle of lateral surface of shaft of humerus

Deltoid insertion

Axillary nerve

Deltoid nerve

Abducts arm; anterior fibers flex and medially rotate arm; posterior fibers extend and laterally rotate arm

Deltoid action

Supraspinous fossa of scapula

Supraspinatus origin

Greater tuberosity of humerus; capsule of shoulder joint

Supraspinatus insertion

Suprascapular nerve

Supraspinatus nerve

Abducts arm and stabilizes shoulder joint

Supraspinatus action

Infraspinous fossa of scapula

Infraspinatus origin

Greater tuberosity of humerus; capsule of shoulder joint

Infraspinatus insertion

Suprascapular nerve

Infraspinatus nerve

Laterally rotates arm and stabilizes shoulder joint

Infraspinatus action

Lower third of lateral border of scapula

Teres major origin

Medial lip of bicipital groove of humerus

Teres major insertion

Lower subscapular nerve

Teres major nerve

Medially rotates and adducts arm and stabilizes shoulder joint

Teres major action

Subscapular fossa

Subscapularis origin

Lesser tuberosity of humerus

Subscapularis insertion

Upper and lower subscapular nerves

Subscapularis nerve

Medially rotates arm and stabilizes shoulder joint

Subscapularis action

Supraglenoid tubercle of scapula

biceps brachii long head origin

Tuberosity of radius and bicipital aponeurosis into deep fascia of forearm

biceps brachii long head insertion

Musculocutaneous nerve

biceps brachii long head nerve

Supinator of forearm and flexor of elbow joint; weak flexor of shoulder joint

biceps brachii long head action

Coracoid process of scapula

biceps brachii short head origin

Coracoid process of scapula

Coracobrachialis origin

Medial aspect of shaft of humerus

Coracobrachialis insertion

Musculocutaneous nerve

Coracobrachialis nerve

Flexes arm and alsoprocess of weak adductor

Coracobrachialis action

Front of lower half of humerus

Brachialis origin

Coronoid process of ulna

Brachialis insertion

Musculocutaneous nerve

Brachialis nerve

Flexes arm and also process of weak adductor

Brachialis action

Infraglenoid tubercle of scapula

triceps long head origin

Upper half of posterior surface of shaft of humerus

triceps lateral head origin

Olecranon process of ulna

triceps lateral head insertion

Radial nerve

triceps lateral head nerve

Extensor of elbow joint

triceps lateral head action

Lower half of posterior surface of shaft of humerus

triceps medial head origin