Shoulder, Upper arm muscles

Question 1

Origin of Deltoid

Answer 1

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

Question 2

Insertion of Deltoid

Answer 2

Deltoid tuberosity

Question 3

All fibers of Deltoid perform this action

Answer 3

Abduct the shoulder (glenohumeral joint)

Question 4

Anterior fibers of Deltoid perform these 3 actions

Answer 4

• Flex the shoulder - Medially rotate the shoulder - Horizontally abduct the shoulder

Question 5

Origin of Teres Major

Answer 5

Inferior angle and lower one-third of lateral border of scapula

Question 6

Insertion of Teres Major

Answer 6

Crest of the lesser tubercle of the humerus

Question 7

The 3 actions of Teres Major

Answer 7

• Extend the shoulder (G/H joint) - Adduct the shoulder (G/H joint) -Medially rotate the shoulder (GH joint)

Question 8

Origin of Supraspinatus

Answer 8

Supraspinous fossa of the scapula

Question 9

Insertion of Supraspinatus

Answer 9

Greater tubercle of the humerus

Question 10

The 2 actions of the Supraspinatus

Answer 10

• Abduct the shoulder (GH joint) - Stabilize the head of the humerus in glenoid cavity

Question 11

Origin of Infraspinatus

Answer 11

Infraspinous fossa of the scapula

Question 12

Insertion of Infraspinatus

Answer 12

Greater tubercle of the humerus

Question 13

The 3 actions of Infraspinatus

Answer 13

• Laterally rotate the shoulder (GH joint) - Adduct the shoulder (GH joint) -Stabilize the head of the humerus in glenoid cavity

Question 14

Origin of Teres Minor

Answer 14

Upper two-thirds of lateral border of the scapula

Question 15

Insertion of Teres Minor

Answer 15

Greater tubercle of the humerus

Question 16

The 3 actions of Teres Minor

Answer 16

• Laterally rotate the shoulder (GH joint) - Adduct the shoulder (GH joint) - Stabilize the head of the humerus in glenoid cavity

Question 17

Origin of Subscapularis

Answer 17

subscapular fossa of the scapula

Question 18

Insertion of Subscapularis

Answer 18

Lesser tubercle of the humerus

Question 19

The 2 actions of Subscapularis

Answer 19

• Medially rotate the shoulder (GH joint) -Stabilize the head of the humerus in glenoid cavity

Question 20

Origin of Biceps Brachii

Answer 20

Short head: Coracoid process of the scapula Long head: Supraglenoid tubercle of scapula

Question 21

Insertion of Biceps Brachii

Answer 21

Tuberosity of the radius and aponeurosis of biceps brachii

Question 22

The 3 actions of Biceps Brachii

Answer 22

• Flex the elbow (humeroulnar joint) -Supinate the forearm (radioulnar joints) - Flex the shoulder (GH joint)

Question 23

Origin of Triceps Brachii

Answer 23

Long head: Infraglenoid tubercle of the scapula Lateral head: Posterior surface of proximal half of the humerus Medial head: Posterior surface of distal half of the humerus

Question 24

Insertion of Triceps Brachii

Answer 24

Olecranon process of the ulna

Question 25

All heads of the Triceps Brachii perform this action

Answer 25

Extend the elbow (humeroulnar joint)

Question 26

Long head of the Triceps Brachii perform these 2 actions

Answer 26

• Extend the shoulder (humeroulnar joint) - Adduct the shoulder (GH joint)

Question 27

Origin of Coracobrachialis

Answer 27

Coracoid process of the scapula

Question 28

Insertion of Coracobrachialis

Answer 28

Medial surface of mid-humeral shaft

Question 29

The 2 actions of Coracobrachialis

Answer 29

• Flex the shoulder (GH joint) - Adduct the shoulder (GH joint)

Question 30

Name the muscle and its two heads

Answer 30

biceps brachii

short head is medial

Long head is lateral

Question 31

Name the muscle

Answer 31

Coracobrachialis

Question 32

Name the muscle

Answer 32

Deltoid

Question 33

Name the muscle

Answer 33

Infraspinatus

Question 34

Name the muscle and its origin and insertion

Answer 34

Biceps brachii

Origin: short head is corocoid process of scapula

Long head is superglenoid tubercle of the scapula

Insertion: Tuberosity of the radius and aponeurosis of biceps brachii

Question 35

Name the muscle, origin, and insertion

Answer 35

Coracobrachialis

Origin: coracoid process of scapula

Insertion: Medial surface of the mid-humeral shaft

Question 36

Name the muscle, origin, insertion

Answer 36

Deltoid

Origin: Lateral one-third of clavicle, acromion, and spine of scapula

Insertion: Deltoid Tuberosity

Question 37

Name the muscle, origin, insertion

Answer 37

Infraspinatus

Origin: infraspinous fossa of scapula

Insertion: Greater tubercle of humerus

Question 38

Name the muscle, origin, insertion

Answer 38

Subscapularis

Origin: Subscapular fossa of the scapula

Insertion: Lesser tubercle of the humerus

Question 39

Name the muscle, origin, insertion

Answer 39

Supraspinatus

Origin: supraspinous fossa of the scapula

Insertion: Greater tubercle of the humerus

Question 40

Name the muscle, origin, insertion

Answer 40

Teres Major

Origin: Inferior angle and lower one-third of lateral border of the scapula

Insertion: Crest of the lesser tubercle of the humerus

Question 41

Name the muscle, origin, and insertion

Answer 41

Teres Minor

Origin: Upper two-thirds of lateral border of scapula

Insertion: Greater tubercle of the humerus

Question 42

Name the muscle

Answer 42

Subscapularis

Question 43

Name that muscle

Answer 43

Supraspinatus

Question 44

Name that muscle

Answer 44

Teres Major

Question 45

Name that muscle

Answer 45

Teres Minor

Question 46

Name that muscle (and its three heads)

Answer 46

Triceps Brachii