Muscles- Shoulder & Rotator Cuff Flashcards
deltoid
O: clavicle, acromion, and spine of scapula (CASS)
I: deltoid tuberosity
A: abduct shoulder (can’t initiate abduction)
pectoralis major
O: clavicle, sternum, and ribs
I: greater tubercle
A: flex, adduct, and internally rotate shoulder
coracobrachialis
O: coracoid process
I: humerus
A: flex, adduct, and internally rotate shoulder
pectoralis minor
O: ribs 3-5
I: coracoid process
A: protract and depress scapula
serratus anterior
O: ribs 1-9
I: anterior surface of medial border of scapula
A: protract scapula and lowers a raised arm
trapezius
O: occipital bone and spinous process C1-T12
I: clavicle, acromion, and spine of scapula (CASS)
A: elevate, retract, and depress scapula
levator scapulae
O: transverse process C1-C4
I: superior angle of scapula
A: elevate scapula
rhomboid minor
O: spinous process C6-C7
I: medial border of scapula
A: stabilize scapula and draw scapula medially upward
rhomboid major
O: spinous process T1-T4
I: medial border of scapula
A: stabilize scapula and draw scapula medially upward
latissimus dorsi
O: ribs 9-12, spinous process T7-T12, inferior angle of scapula, and iliac crest (SIRI)
I: lesser tubercle
A: extend, adduct, and internally rotate shoulder
teres major
O: inferior angle of scapula
I: lesser tubercle
A: extend, adduct, and internally rotate shoulder
supraspinatus
O: supraspinous fossa
I: greater tubercle
A: ABduct shoulder (initiates abduction)
infraspinatus
O: infraspinous fossa
I: greater tubercle
A: externally rotate shoulder
teres minor
O: lateral border of scapula
I: greater tubercle
A: externally rotate shoulder
subscapularis
O: subscapular fossa
I: lesser tubercle
A: internally rotate shoulder
