Muscles of the Upper Body I: AOI Flashcards
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Deltoid
Origin
Clavicle and scapula
Deltoid
Action (Anterior, Middle, Posterior)
Anterior: Flex and medially rotate arm
Middle: Prime mover of arm abduction
Posterior: Extend and laterally rotate arm
Deltoid
Insertion
Deltoid tuberosity
Trapezius
Action (Superior, Middle, Inferior)
Superior: Elevate and superiorly rotate scapula
Middle: Retract scapula
Inferior: Depress scapula
Trapezius
Origin
Occipital bone; C and T vertebrae
Trapezius
Insertion
Clavicle; acromion process and spine of scapula
Latissimus dorsi
Action
Prime mover of arm extension; also adducts and medially rotates arm (“swimmer’s muscle”)
Latissimus dorsi
Origin
T6 - L5; iliac crest
Latissimus dorsi
Insertion
Intertubercular groove of humerus (wraps anterior to humerus)
Teres major
Action
Extends, adducts and medially rotates arm
Teres major
Origin
Inferior scapula
Teres major
Insertion
Intertubercular groove (wraps anterior to humerus)
Rhomboid major
Action
Elevates and retracts scapula; inferiorly rotates scapula
Rhomboid major
Origin
T2 - T5
Rhomboid major
Insertion
Medial border of scapula from spine to inferior angle
Levator scapulae
Action
Elevates scapula; inferiorly rotates scapula
Levator scapulae
Origin
C1 - C4
Levator scapulae
Insertion
Superior part of the medial border of the scapula
Pectoralis major
Action
Prime mover of arm flexion; also adducts and medially rotates arm
Pectoralis major
Origin
Sternum