Muscles that MOVE the upper arm Flashcards
Pectoralis Major (Clavicular)
ORIGIN
Medial half of the clavicle.
INSERTION
Lateral lip of the bicipital groove of humerus.
ACTION
Both heads: adduct and medially rotate humerus. Clavicular: flexes humerus.
INNERVATION
Pectoral.
Pectoralis Major (Sternocostal)
ORIGIN
Anterior surface of the sternum and the upper six costal cartilages.
INSERTION
Lateral lip of the bicipital groove of humerus.
ACTION
Both heads: adduct and medially rotate humerus.
INNERVATION
Pectoral.
Deltoid
ORIGIN
Spine of scapula, lateral 3rd of clavicle, and acromion.
INSERTION
Deltoid tuberosity of humerus.
ACTION
Anterior: flex and medially rotate humerus. Middle: principal abductor of humerus. Posterior: extend and laterally rotate humerus.
INNERVATION
Axillary.
Deltoid: Anterior Fibers
ORIGIN
Lateral 1/3 of clavicle.
INSERTION
Deltoid tuberosity of humerus.
ACTION
Flex and medially rotate humerus.
INNERVATION
Axillary.
Deltoid: Middle Fibers
ORIGIN
The superior surface of the acromion process.
INSERTION
Deltoid tuberosity of humerus.
ACTION
Abduction of humerus.
INNERVATION
Axillary.
Deltoid: Posterior Fibers
ORIGIN
The lower lip of the spine of scapula.
INSERTION
Deltoid tuberosity of humerus.
ACTION
Extend and laterally rotate humerus.
INNERVATION
Axillary.
Coracobrachialis
ORIGIN
Coracoid process of scapula.
INSERTION
Anterior medial shaft of humerus.
ACTION
Flexes and adducts humerus.
INNERVATION
Musculocutaneous.
Supraspinatus
ORIGIN
Supraspinous fossa of scapula.
INSERTION
Greater tubercle of humerus.
ACTION
Assists deltoid in abduction of humerus. Initiates abduction.
INNERVATION
Suprascapular.
Infraspinatus
ORIGIN
Infraspinous fossa of scapula.
INSERTION
Greater tubercle of humerus.
ACTION
Lateral rotation of humerus.
INNERVATION
Suprascapular.
Subscapularis
ORIGIN
Subscapular fossa.
INSERTION
Lesser tubercle of humerus.
ACTION
Medial rotation of humerus.
INNERVATION
Subscapular.
Teres Minor
ORIGIN
Lateral border of scapula.
INSERTION
Greater tubercle of humerus.
ACTION
Lateral rotation of humerus.
INNERVATION
Axillary.
Teres Major
ORIGIN
Inferior angle of the scapula and lower lateral border of scapula.
INSERTION
Medial lip of the bicipital of the humerus.
ACTION
Extends, medially rotates, and adducts humerus.
INNERVATION
Subscapular.
Latissimus Dorsi
ORIGIN
The spinous processes of vertebrae T7-L5, thoracolumbar fascia, iliac crest, ribs 9-12, and the inferior angle of scapula.
INSERTION
Bicipital groove of humerus.
ACTION
Extends, adducts, and medially rotates humerus.
INNERVATION
Thoracodorsal.
