Movements of the Arm

Question 1

Pectoralis major origin?

Answer 1

sternal end of clavicle, sternum, cartilage of ribs 1-6, & aponeurosis of external oblique muscle

Question 2

Latissimus dorsi origin?

Answer 2

indirectly via lumbodorsal fascia into spines of T7-L5, lower 4 ribs & iliac crest

Question 3

Deltoid origin?

Answer 3

lateral 3rd of clavicle, acromion & spine of scapula

Question 4

Supraspinatus origin?

Answer 4

supraspinous fossa of scapula

Question 5

Infraspinatus origin?

Answer 5

infraspinous fossa of scapula

Question 6

Subscapularis origin?

Answer 6

subscapular fossa of scapula

Question 7

Teres minor origin?

Answer 7

lateral border of dorsal scapular surface

Question 8

Teres major origin?

Answer 8

posterior surface of scapula at inferior angle

Question 9

Coracobrachialis origin?

Answer 9

coracoid process of scapula

Question 10

Pectoralis major insertion?

Answer 10

by a short tendon into intertubercular groove of humerus

Question 11

Latissimus dorsi insertion?

Answer 11

floor of intertubercular groove of humerus

Question 12

Deltoid insertion?

Answer 12

deltoid tuberosity of humerus

Question 13

Supraspinatus insertion?

Answer 13

superior part of greater tubercle of humerus

Question 14

Infraspinatus insertion?

Answer 14

greater tubercle of humerus, posterior to supraspinatus

Question 15

Subscapularis insertion?

Answer 15

lesser tubercle of humerus

Question 16

Teres minor insertion?

Answer 16

greater tubercle of humerus, inferior to infraspinatus

Question 17

Teres major insertion?

Answer 17

intertubercular groove of humerus, tendon fused with tendon of latissimus dorsi

Question 18

Coracobrachialis insertion?

Answer 18

medial surface of humerus shaft

Question 19

Pectoralis major action?

Answer 19

prime mover of arm flexion
agonist of arm flexion
rotates arm medially
adducts arm against resistance

Question 20

Latissimus dorsi action?

Answer 20

prime mover of arm extension
agonist of arm extension
powerful arm adductor
medially rotates arm & shoulder

Question 21

Deltoid action?

Answer 21

Prime mover of arm abduction when it’s fibers contract simultaneously
agonist of arm abduction
antagonist of pectoralis major & latissimus dorsi

Question 22

Supraspinatus action?

Answer 22

initiates abduction

stabilizes shoulder joint

Question 23

Infraspinatus action?

Answer 23

stabilizes shoulder joint

Question 24

Subscapularis action?

Answer 24

Chief medial rotator of humerus

Question 25

Teres minor action?

Answer 25

stabilizes shoulder joint

Question 26

Teres major action?

Answer 26

extends, medially rotates, and adducts humerus

synergist of latissimus dorsi

Question 27

Coracobrachialis action?

Answer 27

flexes and adducts humerus

synergist of pectoralis major

Question 28

Pectoralis major innervation?

Answer 28

Lateral & medial pectoral nerves C5-C8 and T1

Question 29

Latissimus dorsi innervation?

Answer 29

Thoracodorsal C6- C8

Question 30

Deltoid innervation?

Answer 30

Axillary nerve C5- C6

Question 31

Supraspinatus innervation?

Answer 31

Suprascapular nerve

Question 32

Infraspinatus innervation?

Answer 32

Suprascapular nerve

Question 33

Subscapularis innervation?

Answer 33

Subcapular nerve C5- C7

Question 34

Teres minor innervation?

Answer 34

Axillary nerve

Question 35

Teres major innervation?

Answer 35

Lower scapular nerve C6 and C7

Question 36

Coracobrachialis innervation?

Answer 36

Musculocutaneous nerve C5- C7