Lecture 11: Brachium And Elbow

Question 1

What muscles extend the arm

Answer 1

Supraspinatus
Triceps brachii (long head)
Brachiocephalicus

Question 2

What muscles flex the arm (delta takes little planes)

Answer 2

• deltoideus
• teres major
• teres minor
• latissimus dorsi
• pectoralis profundus

Question 3

What muscle abduct the arm

Answer 3

Infraspinatus

Question 4

What muscles adduct the arm

Answer 4

• pectoral muscles
• subscapularis
• coracobrachialis

Question 5

What are the 3 joints of the elbow

Answer 5

Radio-humeral joint
Ulno-humeral joint
Proximal radio-ulnar joint

Question 6

What ligaments support the elbow

Answer 6

Lateral collateral
Medial collateral
Annular ligament of radius
Oblique ligament

Question 7

What ligament of the elbow prevents over-extension of the elbow

Answer 7

Oblique ligament

Question 8

What ligaments of the elbow prevent excessive abduction and adduction of the radius and ulna relative to the humerus

Answer 8

Collateral ligaments

Question 9

What joints of the elbow permit the flexion/extension along a sagittal plane

Answer 9

Radio-humeral joint
Ulno-humeral joint

Question 10

What ligament of the elbow allows for pronation/supination of the distal radius

Answer 10

Annular ligament of the radius

Question 11

What are the flexor muscles of the arm that act at the elbow

Answer 11

Biceps brachii
Brachialis

Question 12

What artery supplies the flexor compartment muscles of the arm

Answer 12

Brachial artery

Question 13

What nerve innervates the flexor muscles of the arm

Answer 13

Musculocutaneous

Question 14

What are the extensor muscles of the arm that act on the elbow

Answer 14

triceps brachii
tensor fascia antebrachi
anconeus

Question 15

What artery supplies the extensor muscles of the arm

Answer 15

Deep brachial artery

Question 16

What nerve innervates the extensor muscles of the arm

Answer 16

Radial nerve

Question 17

Origin of the long head of triceps brachii (1)

Answer 17

Infaglenoid tubercle and caudal edge of scapula

Question 18

Origin of the lateral head of Cicero’s brachii (2)

Answer 18

B/w the tuberosity for the teres minor and the deltoid tuberosity

Question 19

Origin of the medial head of the triceps brachii (3)

Answer 19

On the crest of the minor tubercle b/w the point of insertion of the teres major and that of the coracobrachialis

Question 20

Origin of the accessory head of the triceps brachii (4)

Answer 20

From the proximal caudal part of the neck to the humerus

Question 21

What is the insertion point of the triceps brachii

Answer 21

Olecranon process of the ulna

Question 22

What happens when there is an avulsion fracture of the olecranon

Answer 22

Loss of triceps brachii attachment
Loss of elbow extension
- inability to support weight of the limb

Question 23

What is the origin and insertion of the brachialis

Answer 23

O: caudal aspect of the proximal humerus
I: ulnar tuberosity b/w 2 deep insertion of biceps brachi

Question 24

Origin of the biceps brachii

Answer 24

O: supraglenoid tubercle

Question 25

What are the deep insertions of the biceps brachii

Answer 25

On the radial tuberosity and medial ulna

Question 26

What is the superficial insertion of the biceps brachii

Answer 26

Antebrachial fascia via bicipital aponévroses (lateral fibrosis)

Question 27

In horses, a fibrous band, the _______ joins the tendons of origin and insertion of the biceps brachii

Answer 27

The internal tendon

Question 28

The ____ tendon enables the muscle to store energy when stretched during the support phase of stride

Answer 28

Central

Question 29

The brachial plexus is protected by muscles of the arm, particularly the _________ and _______

Answer 29

Pectoral muscles and serratus ventralis

Question 30

What is the origin of the radial nerve

Answer 30

C7-T1

Question 31

What muscles are innervated by the radial nerve

Answer 31

Triceps brachii, anconeus, tensor fasciae antebrachii

Question 32

What is the origin of the musculocutaneous nerve

Answer 32

C7-C8

Question 33

What muscles are innervated by the musculocutaneous nerve

Answer 33

Coracobrachialis Biceps brachii Brachialis

Question 34

What is the origin of the medial and ulnar nerves

Answer 34

C8-T1

Question 35

What muscles does the median nerve innervated

Answer 35

Most of the flexor muscles of the carpus and digits

Question 36

What muscles does the ulnar nerve innervate

Answer 36

Most of the flexor muscles of the carpus and digit

Question 37

What is #1

Answer 37

Humeral shaft

Question 38

What is #2

Answer 38

Medial epicondyle

Question 39

What is #3

Answer 39

Lateral epicondyle

Question 40

What is #4

Answer 40

Trochlea of humerus

Question 41

What is #5

Answer 41

Capitulum of humerus

Question 42

What is #6

Answer 42

Olecranon (ulna)

Question 43

What is #7

Answer 43

Olecranon process (tuber)

Question 44

What is #8

Answer 44

Medial coronoid process of ulna

Question 45

What is #9

Answer 45

Head of radius

Question 46

Which neurovascular structures are potentially endangered by a fracture of the humeral shaft