Muscles Week 9

Question 1

What is the origin of the Teres Major?

Answer 1

Inferior, lateral border of scapula

Question 2

What is the insertion of the Teres Major?

Answer 2

Medial lip of bicipital groove of humerus (medial to latissimus)

Question 3

What is the action of the Teres Major?

Answer 3

Medial rotation and adduction of shoulder

Question 4

What nerve innervates the Teres Major?

Answer 4

Lower subscapular nerve

Question 5

What is the origin of the Serratus Anterior?

Answer 5

Ribs 1-9 (lateral surface)

Question 6

What is the insertion of the Serratus Anterior?

Answer 6

Anterior medial border of scapula

Question 7

What is the action of the Serratus Anterior?

Answer 7

Protraction (abduction) and upward rotation of scapula

Question 8

What nerve innervates the Serratus Anterior?

Answer 8

Long thoracic nerve

Winging of scapula can occur if long thoracic nerve is damaged.

Question 9

What is the origin of the pectoralis major?

Answer 9

Clavicular fibers: medial ½ of clavicle; sternal fibers: anterior sternum; costal fibers: costal cartilage of ribs 1-7

Question 10

Where does the pectoralis major insert?

Answer 10

Lateral lip of bicipital groove of humerus

“a lady between 2 majors”

Question 11

What is the action of the pectoralis major?

Answer 11

Adduction and medial rotation of shoulder; horizontal adduction of shoulder

Also used in push-ups, bench press, throwing

Question 12

What nerves innervate the pectoralis major?

Answer 12

Medial and lateral pectoral nerves

Question 13

What is the origin of the coracobrachialis?

Answer 13

Coracoid process of scapula

Question 14

Where does the coracobrachialis insert?

Answer 14

Medial shaft of humerus (middle 1/3)

Question 15

What are the actions of the coracobrachialis?

Answer 15

Flexion and adduction of shoulder

Horizontal adduction of shoulder

Question 16

What is the innervation of the coracobrachialis?

Answer 16

Musculocutaneous nerve

Question 17

Which muscles attach to the coracoid process?

Answer 17

Short head of biceps, coracobrachialis, and pectoralis minor

Question 18

What is the origin of the long head of the Biceps Brachii?

Answer 18

Supraglenoid tubercle and glenohumeral labrum

Question 19

What is the origin of the short head of the Biceps Brachii?

Answer 19

Coracoid process of scapula

Question 20

Where does the Biceps Brachii insert?

Answer 20

Radial tuberosity and bicipital aponeurosis

Question 21

What actions does the Biceps Brachii perform?

Answer 21

Flexion and supination of elbow; flexion of shoulder

Question 22

What is the innervation of the Biceps Brachii?

Answer 22

Musculocutaneous nerve

Question 23

What is the origin of the Brachialis?

Answer 23

Anterior distal ½ of humerus

Question 24

What is the insertion of the Brachialis?

Answer 24

Ulnar tuberosity and coronoid process of ulna

Question 25

What is the action of the Brachialis?

Answer 25

Flexion of elbow (main elbow flexor)

Question 26

What is the innervation of the Brachialis?

Answer 26

Musculocutaneous and radial nerve

Question 27

What is the origin of the long head of the Triceps Brachii?

Answer 27

Infraglenoid tubercle and neck of scapula

Question 28

What is the origin of the lateral head of the Triceps Brachii?

Answer 28

Upper half of posterior surface of shaft of humerus (above radial groove)

Question 29

What is the origin of the deep (medial) head of the Triceps Brachii?

Answer 29

Posterior shaft of humerus (below radial groove)

Question 30

Where does the Triceps Brachii insert?

Answer 30

Olecranon process

Question 31

What is the action of the Triceps Brachii?

Answer 31

Extension of elbow

Question 32

What is the innervation of the Triceps Brachii?

Answer 32

Radial nerve (axillary nerve - long head)

Question 33

What is the origin of the Brachioradialis?

Answer 33

Lateral supracondylar ridge of humerus

Question 34

What is the insertion of the Brachioradialis?

Answer 34

Styloid process of radius

Question 35

What is the action of the Brachioradialis?

Answer 35

Flexion of elbow (pronation of forearm when supinated, supination of forearm when pronated)

Question 36

What is the innervation of the Brachioradialis?

Answer 36

Radial nerve

Question 37

Answer 37

Teres major

Question 38

Answer 38

Serratus Anterior

Question 39

Answer 39

Pectoralis Major

Question 40

Answer 40

Coracobrachialis

Question 41

Answer 41

Biceps Brachii

Question 42

Answer 42

Brachialis

Question 43

Answer 43

Triceps Brachii

Question 44

Answer 44

FYI Brachioradialis