muscles

Terms	Definitions
Rhomboid Major	Action: adduct scapula (scapulothoracic Joint) elevate the scapula (STJ) Downwardly rotate scapula (STJ)
Masseter	Elevates mandible Assists in protracting the Mandible
Sternocleidomastiod (SCM)	Actions include neck flexion Lateral Flexion s/s rotate head o/s assist in inhalation
Temporalis	elevate Mandible retract Mandible
Occipitalis (occipitofrontalis)	anchor and retract galea aponeurotica
Frontalis (occipitofrontalis)	raise the eyebrows wrinkle forehead
Platysma	depress Mandible tighten fascia of neck draw down corner of mouth
Rhomboid Minor	adduct the scapula (STJ) elevate scapula scapula
Teres Minor	lateral rotate the shoulder (G/H ) adduct the shoulder stabilize the Humerus in Glenoid cavity
Supraspinatus	abduct the shoulder (G/H) stablize head of Humerus in Glenoid Cavity
Levator Scapula	Unilaterally: elevate scapula downwardly rotate scapula laterally flex head and neck Bilaterally: extend head and neck rotate head and neck s/s
Latissimus Dorsi	extend shoulder (G/H) adduct G/H medially rotate G/H
Serratus Anterior	abduct the scapula upwardly rotate scapula depress scapula hold medial border of the scapula against rib cage
Pectoralis Major	ALL FIBERS: adduct shoulder Medial rotation assist elevation during inhalation UPPER FIBERS: flex shoulder horizon adduction LOWER FIBERS: extend shoulders
Teres Major	adduct shoulder G/H extend G/H Medially rotate G/H
Infraspinatus	laterally rotate shoulder (G/H) adduct G/H stablize the head of Humerus in Glenoid Cavity
Trapezius	Unilaterally: extend head and neck lateral flexion of head and neck s/s rotate head and neck o/s elevate scapula upwardly rotate
Subscapularis	medially rotate the shoulder (G/HJ) stablize the head of Humerus in Glenoid cavity
Deltoid	ALL FIBERS: abduct shoulder (G/H) ANTERIOR FIBERS: Flex G/H medially rotate G/H horizontally adduct G/H POSTERIOR FIBERS: extend G/H laterally rotate G/H horizontally abduct