Week 6: Elbow and Forearm

Question 1

Origin (1) of Brachialis

Answer 1

Distal ½ of the anterior shaft of the humerus

Question 2

Insertion (1) of Brachialis

Answer 2

Ulnar tuberosity

Question 3

Innervation (1) of Brachialis

Answer 3

Musculocutaneous N. (C5-C7)

Question 4

Action (1) of Brachialis

Answer 4

Flexion of the forearm (in pronation)

Question 5

Origin (2) of Biceps Brachii

Answer 5

LH: supraglenoid tubercle of the scapula
SH: Coracoid process of the scapula

Question 6

Insertion (2) of Biceps Brachii

Answer 6

Radial Tuberosity and fascia at the medial elbow

Question 7

Innervation (1) of Biceps Brachii?

Answer 7

Musculocutaneous N. (C5-C7)

Question 8

Action (1) of Biceps Brachii?

Answer 8

Flexion of forearm (in supination)

Question 9

Origin (1) of Brachioradialis

- which side?

Answer 9

Lateral supracondylar ridge of the humerus

Question 10

Insertion (1) of Brachioradialis?

Answer 10

Styloid process of the radius

Question 11

Innervation (1) of Brachioradialis?

Answer 11

Radial N. (C5-T1)

Question 12

Action (1) of Brachioradialis?

Answer 12

Flexion of forearm (in neutral)

Question 13

Origin (3) of Triceps Brachii

Answer 13

Long Head: infraglenoid tubercle of the scapula
Lateral Head: posterior shaft of the humerus
Medial-deep Head:posterior shaft of the humerus

Question 14

Insertion (1) of Triceps Brachii

Answer 14

Olecranon process of the ulna

Question 15

Innervation (1) of Triceps Brachii?

Answer 15

Radial N. (C5-T1)

Question 16

Action (1) of Triceps Brachii?

Answer 16

Extension of forearm

Question 17

Origin (1) of Anconeus?

Answer 17

Lateral epicondyle of the humerus

Question 18

Insertion (1) of Anconeus?

Answer 18

Posterior proximal ulna

Question 19

Innervation (1) of Anconeus?

Answer 19

Radial N. (C5-T1)

Question 20

Action (1) of Anconeus?

Answer 20

Extension of the forearm

Question 21

Origin (2) of Supinator?

**Remember there are 2 separate parts

Answer 21

Lateral epicondyle of the humerus and proximal ulna

Question 22

Insertion (1) of Supinator?

Answer 22

Proximal radius

Question 23

Innervation (1) of Supinator?

Answer 23

Radial N. (C5-T1)

Question 24

Action (1) of Supinator?

Answer 24

supinate the forearm

Question 25

Origins (2) of Pronator Teres

Answer 25

Humeral head- medial epicondyle of the humerus via the common flexor tendon Ulnar head- Coronoid process of the ulna

Question 26

Insertion (1) of Pronator Teres?

Answer 26

Lateral radius

Question 27

Innervation (1) of Pronator Teres?

Answer 27

Median N. (C5-T1)

Question 28

Action (1) of Pronator Teres?

Answer 28

Pronation of the forearm

Question 29

Origin (1) of PQ?

Answer 29

Anterior distal ulna

Question 30

Insertion (1) of PQ?

Answer 30

Anterior distal radius

Question 31

Innervation (1) of PQ?

Answer 31

Median N. (C5-T1)

Question 32

Action (1) of PQ?

Answer 32

Pronation of the forearm

Question 33

What is the closed pack position of the ulnohumeral joint?

Answer 33

full extension

Question 34

What is the resting position of the ulnohumeral joint?

Answer 34

70 degrees elbow flexion with 10 degrees supination

Question 35

What is the closed pack position of the radiohumeral joint?

Answer 35

90 degrees of flexion | 5 degrees of supination

Question 36

What is the resting position of the radiohumeral joint?

Answer 36

full elbow extension with full FA supination

Question 37

What is the closed pack position of the radioulnar joint?

Answer 37

full pronation or full supination

Question 38

What is the resting position for the radioulnar joint?

Answer 38

70 degrees flexion | 35 degrees supination

Question 39

What 3 things articulations occur in the ulnohumeral joint?

Answer 39

1. trochlea (distal humerus) to trochlear notch (ulna) 2. coronoid process (ulna) to coronoid fossa (distal humerus) 3. olecranon process (ulna) to olecranon fossa (distal humerus)

Question 40

What articulation occurs in the radiohumeral joint?

Answer 40

capitulum (humerus) to radial head (radius)

Question 41

The ulnar collateral ligament connects what structures?

Answer 41

Ulna and humerus Medial epicondyle to the Coronoid and Olecranon process

Question 42

The radial collateral ligament connects what structures?

Answer 42

radius and humerus lateral epicondyle to the olecranon process

Question 43

The annular ligament connects what structures?

Answer 43

proximal radius to proximal ulna anterior and posterior aspect of the radial notch

Question 44

Function of the radioulnar joint?

Answer 44

movement between the radius and ulna in pronation and supination

Question 45

What happens during pronation to the radius and ulna?

Answer 45

The proximal radius rotates and the distal end cross over the ulna diagonally

Question 46

Which is more powerful: supination or pronation?

Answer 46

supination

Question 47

T/F: muscles that pronate/supinate the arm insert on the ulna?

Answer 47

False, they insert on the radius

Question 48

T/F: in pronation/supination, the radius does the movement?

Answer 48

True

Question 49

What are the 3 radioulnar joint articulations?

Answer 49

1. Proximal 2. Middle 3. Distal

Question 50

Which ligament surrounds the radioulnar joint and attaches it to the radial notch on the ulna?

Answer 50

Annular ligament

Question 51

What things articulate in the proximal radioulnar joint?

Answer 51

the radial head (radius) with the radial notch (ulna)

Question 52

What functions to maintain the articulation between the radius and ulna?

Answer 52

interosseous membrane

Question 53

T/F: the middle radioulnar joint is a true joint?

Answer 53

False, it does not restrict movement

Question 54

What 2 things articulate in the distal radioulnar joint?

Answer 54

the head of the ulna and distal end of the radius

Question 55

How is the distal radioulnar joint held together?

Answer 55

By a disc of fibrocartilage joining the styloid (ulna) to the ulnar notch (radius)

Question 56

Whats the most common joint classification?

Answer 56

3rd class lever