Muscles Flashcards
(104 cards)
Which large tirangular muscle, over the upper shoulder & back of trunk,
Trapezius
What is the action of the Trapezius?
adducts, raises & rotates scapula, draws head back
Where are the O/I of the Trapezius?
O: occipital bone, ligamentum nuchae, spinous process of thoracic vertebrae
I: outer 1/3 clavicle, scapular spine & acromion
What is the large muscle under the Trapezius?
Rhomboideus Major
Where are the O/I of the Rhomboideus Major?
O: spinous process of thoracic vertebrae
I: vertebral border of scapula
What is the action of the Rhomboideus major?
adductes & rotates the scapula
What is the action of the Deltoid?
abducts arm
Where are the O/I of the Deltoid?
O: lateral 1/3 clavicle, acromion & spine of scapula
I: deltoid tuberosity of humerus
Which fan-shaped muscle covers upper chest?
Pectoralis Major
What is the action of the Pectoralis Major?
flexes, adducts, medially rotates arms
Where are the O/I of the Pectoralis Major?
O:medial 1/2 clavicle, body of sternum, 2-6 rib cartilage
I: intertubecular sulcus of humerus
What thin, flat, muscle is deep to the Pectoralis Major and used when slouching forward?
Pectoralis Minor
Where are the O/I of the Pectoralis Minor?
O: ventral surface of ribs 3-5
I: coracoid process of scapula
What is the action of the Pectoralis Minor?
draws scapula forward & down, some rotation
Which muscle covers upper & lateral surfaces of ribs?
“saw toothed”
Serratus Anterior
Where are the O/I of the Serratus Anterior?
O: outer surface ribs 1-9
I: ventral surface of scapula near vertebral border
What is the action of the Serratus Anterior
protracts shoulder
Which broad, flat, muscle covers the lumbar area of the back?
Latissimus Dorsi
Where are the O/I of the Latissimus Dorsi?
O: ribs 8-12; spinous processes of lower thoracic & lumbar vertebrae
I: intertubecular groove of humerous
What is the action of the latissimus dorsi?
extend, adduct, medially rotate arm
Which upper shoulder muscle is completely covered by the trapezius & deltoid?
Suprasinatus
What is the action of the suprasinatus?
abducts arm
Where are the O/I of the Suprspinatus?
O: supraspinous fossa of scapula
I: greater tubercle of humerous
What lower shoulder muscle is completely covered by the trapezius & deltoid?
Infraspinatus