Muscles of Shoulder

Question 1

Deltoid

Answer 1

O: clavicle, acromion, spine of scapula
I: deltoid tuberosity
A: aBduct shoulder

Question 2

Pectoralis Major

Answer 2

O: clavicle, sternum, ribs
I: greater tubercle of humerus
A: flex, aDduct, internally rotate shoulder

Question 3

Coracobrachialis

Answer 3

flex, aDduct, internally rotate shoulder

Question 4

Pectoralis Minor

Answer 4

protract & depress scapula

Question 5

Serratus Anterior

Answer 5

O: ribs 1-9
I: anterior surface of medial border of scapula
A: protract scapula & lowers a raised arm

Question 6

Trapezius

Answer 6

O: occipital bone & spinous process C1-T12
I: clavicle, acromion, spine of scapula
A: retract, elevate, depress scapula

Question 7

Levator Scapulae

Answer 7

elevate scapula

Question 8

Rhomboid Major

Answer 8

O: spinous process T1-T4
I: medial border of scapula
A: steady scapula & draw scapula medially upward

Question 9

Rhomboid Minor

Answer 9

O: spinous process C6-C7
I: medial border of scapula
A: steady scapula & draw scapula medially upward

Question 10

Latissimus Dorsi

Answer 10

O: spinous process T7-T12; ribs 9-12; iliac crest; inferior angle of scapula
I: lesser tubercle of humerus
A: extend, aDduct, & internally rotate shoulder

Question 11

Teres Major

Answer 11

O: inferior angle of scapula
I: lesser tubercle of humerus
A: extend, aDduct & internally rotate shoulder