Shoulder and Upper Arm

Question 1

What is the origin of the pectoralis minor?

Answer 1

Anterior surface of ribs 3-5 (or 2-4)

Question 2

What is the insertion of the pectoralis minor?

Answer 2

Coracoid process of the scapula

Question 3

What is the action of the pec minor?

Answer 3

draws scapula forward and downwards (ribs fixed)
drabs rip cage superiorly (scapula fixed)

Question 4

What is the origin of the subclavius?

Answer 4

Costal cartilage of rib 1

Question 5

What is the insertion of the subclavius?

Answer 5

groove on the inferior surface of the clavicle

Question 6

What is the function of the subclavius?

Answer 6

Stabilizes and depresses pectoral gridle

Question 7

What is the origin of the serratus anterior?

Answer 7

by series of muscle slips from ribs 1-9

Question 8

What is the insertion of the serratus anterior?

Answer 8

Anterior surface of the vertebral border of the scapula

Question 9

What is the action of the serratus anterior?

Answer 9

An agonist to protract and hold scapula against rib cage
rotates scapula (inferior angle laterally and upward)

Abducts and rasies arm and horizontal movements

Question 10

What is the origin of the trapezius?

Answer 10

Occipital bone, ligamentum nuchae, spines of C7-T12

Question 11

What is the insertion of the trapezius?

Answer 11

Spine and acromion of scapula, lateral 3rd of clavicle

Question 12

What is the action of the trapezius?

Answer 12

Stabilizes, raises, retracts and rotates scapula
Adducts and retracts scapula (middle)
Elevates scapula or synergist to head extension
Depresses scapula and shoulder

Question 13

What is the origin of the Levator Scapulae?

Answer 13

Transverse process of C1-C4

Question 14

What is the insertion of the Levator Scapulae?

Answer 14

medial border of scapula, superior to spine

Question 15

What is the action of the levator scapulae?

Answer 15

Elevates and adducts scapula ( Assists/synergist to traps)

Tilts glenoid cavity down, flexes neck to same side (fixed scapula)

Question 16

What is the origin of the rhomboid minor?

Answer 16

The spinous process of C7 and T1

Question 17

What is the insertion of the rhomboid minor?

Answer 17

Medial border of scapula

Question 18

What is the action of the rhomboid minor?

Answer 18

Retracts scapula (squaring shoulders)
Synergist with middle fibers of trapezius
Rotate glenoid cavity (lowers arm against resistance)
Stabilize scapula

Question 19

What is the origin of the rhomboid major?

Answer 19

Spinous process of T2 and T5

Question 20

What is the insertion of the rhomboid major?

Answer 20

Medial border of scapula

Question 21

What is the action of the rhomboid major?

Answer 21

Retracts scapula (squaring shoulders)
Synergist with middle fibers of trapezius
Rotate glenoid cavity (lowers arm against resistance)
Stabilize scapula

Question 22

What is the origin of the pec major?

Answer 22

Sternal end of the clavicle, sternum, cartilage of ribs 1-6 and aponeurosis of external oblique muscle

Question 23

What is the insertion of the pec major?

Answer 23

by a short tendon into the intertubercular groove of the humerus

Question 24

What is the action of the pec major?

Answer 24

Agonist of arm flexion
Rotates arm medially
Adducts arm against resistance
Pulls rib cage upward with scapula fixe

Question 25

What is the origin of the Latissimus Dorsi?

Answer 25

Via lumbodorsal fascia into spines of T7-L5, lower 4 ribs and iliac crest.

Question 26

What is the insertion of the Latissimus Dorsi?

Answer 26

the intertubercular groove of the humerus

Question 27

What is the action of the Latissimus Dorsi?

Answer 27

Agonist of Arm extension Powerful arm adductor Medially rotates arm and shoulder Depresses Scapula Pulls body upward and forward with arms fixed overhead

Question 28

What is the origin of the deltoid?

Answer 28

Lateral third of the clavicle, acromion and spine of the scapula

Question 29

What is the insertion of the deltoid?

Answer 29

Deltoid tuberosity of humerrus

Question 30

What is the action of the deltoid?

Answer 30

Agonist of arm abduction with all fibers, antagonist of pec major + latissimus dorsi Flexes and medially rotates humerus with anterior fibers, synergist of pec major Extends and laterally rotates arms with posterior fibers

Question 31

What is the origin of the supraspinatus?

Answer 31

Supraspinous foss of the scapula

Question 32

What is the insertion of the supraspinatus?

Answer 32

The superior part of the greater tubercle of the humerus?

Question 33

What is the action of the supraspinatus?

Answer 33

Stabilizes shoulder joint helps prevent downward dislocation of the humerus

Question 34

What is the origin of the infraspinatus?

Answer 34

infraspinous fossa of the scapula

Question 35

What is the insertion of the infraspinatus?

Answer 35

greater tubercle of the humerus, posterior to the supraspinatus

Question 36

What is the action of the infraspinatus?

Answer 36

It helps hold the head of the humerus in the glenoid cavity Stabilizes the should joint, rotates humerus laterally

Question 37

What is the origin of the subscapularis?

Answer 37

Subscapular fossa of the scapula

Question 38

What is the insertion of the subscapularis?

Answer 38

lesser tubercle of the humerus

Question 39

What is the action of the subscapularis?

Answer 39

Chief medial rotator of humerus, assisted by pec major It helps to hold the head of the humerus in the glenoid cavity, stavilizes shoulder

Question 40

What is the origin of the Teres Minor?

Answer 40

The lateral border of the dorsal scapular surface

Question 41

What is the insertion of the Teres Minor?

Answer 41

Greater tubercle of humerus, inferior to infraspinatus

Question 42

What is the action of the teres minor?

Answer 42

helps hold the head of the humerus in the glenoid cavity stabilizes shoulder joint, rotates humerus laterally

Question 43

What is the origin of the teres major?

Answer 43

The posterior surface of the scapula at the inferior angle

Question 44

What is the insertion of the teres major?

Answer 44

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

Question 45

What is the action of the teres major?

Answer 45

Posteromedially extends, medially rotates and adducts arm Synergist of latissimus dorsi

Question 46

What is the origin of the coracobrachialis?

Answer 46

the coracoid process of the scapula

Question 47

What is the insertion of the coracobrachialis?

Answer 47

Medial surface of humerus shaft

Question 48

What is the action of the coracobrachialis?

Answer 48

Flexion and adduction of humerus Synergist of pec major