Chapter 11 (Elbow Joint)

Question 1

The elbow joint consists of what bones?

Answer 1

humerus, ulna, radius

Question 2

Normal ROM in flexion of elbow joint is

Answer 2

145 degrees

Question 3

T/F

Radius is on the thumb side of hand

Answer 3

True

Question 4

T/F

Ulna is on the pinky side of hand

Answer 4

True

Question 5

Normal ROM in extension of elbow is

Answer 5

0 degrees

Question 6

what are the 4 elbow joints?

Answer 6

1. Humeroulnar joint
2. humeroradial joint
3. superior or proximal radioulnar joint
4. inferior or distal radioulnar joint

Question 7

Humeroulnar joint and humeroradial

Answer 7

uniaxial hinge joint
ROM 0-145
moves in sagittal plane

Question 8

superior or proximal radioulnar joint and Inferior or distal radioulnar joint

Answer 8

• uniaxial pivot joint
• moves in transverse plane
• motions are supination ROM 90 degrees
• pronation ROM 80 degrees
• radius rotates around ulna

Question 9

Can the ulna rotate?

Answer 9

The radius moves around the ulna, The ulna does not rotate at all it is locked in place.

Question 10

What is carrying angle?

Answer 10

• longitudinal axes of humerus and forearm form an angle.
• Greater in woman 10-15 degrees
• men 5 degrees

Question 11

What are the bony landmarks on scapula that move the elbow joint

Answer 11

• supraglenoid tubercle- (above) attaches long head of bicep
• Infraglenoid tubercle -(below) attaches long head triceps
• Coracoid process- attaches short head bicep

Question 12

What are the bony land marks of humerus?

Answer 12

• trochlea -capitulum
• medial epicondyle -lateral epicondyle
• olecranon process

Question 13

Describe the trochlea

Answer 13

• medial side articulates with ulna

- sits inside end of ulna “scoop part”

Question 14

Describe the capitulum

Answer 14

lateral side articulates with radial head

Question 15

Describe the medial epicondyle

Answer 15

pronator teres attachment

Question 16

Attachment for Anconeus and supinator

Answer 16

Lateral epicondyle

Question 17

This part of humerus articulates with olecranon process

Answer 17

olecranon fossa

Question 18

What are the bony land marks of ulna?

Answer 18

• olecranon process -trochlear
• coronoid process -radial notch
• ulnar tuberosity -styloid process

Question 19

Olecranon process

Answer 19

Tricep attachment

Question 20

What does the trochlear articulate with?

Answer 20

trochela

Question 21

Coronoid process

Answer 21

Brachialis attachment (point on scoop part of ulna)

Question 22

This part of ulna articulates with radial head

Answer 22

Radial notch

Question 23

Ulnar tuberosity

Answer 23

• brachialis attachment

- Bump serves for muscle attachment

Question 24

Styloid process of ulna *

Answer 24

distal end, medially

Question 25

What are the bony landmarks of radius?

Answer 25

1. Head - articulates with capitulum on humerus 2. Radial tuberosity - bicep attachment 3. Styloid process - brachioradialis attachment at distal end

Question 26

This keeps radius and ulnar together and serves as muscle attachment

Answer 26

Interosseous membrane

Question 27

What are the muscles of the elbow and forearm?

Answer 27

- brachialis -brachioradialis - biceps -supinator - triceps -Anconeus - Pronator teres -pronator quadratus

Question 28

What is the origin, insertion and action of the brachialis muscle?

Answer 28

O: humerus I: ulna A: Elbow flexion

Question 29

What is the origin, insertion and action of the biceps brachii muscle?

Answer 29

****2 origins 1 insertion***** O: Scapula (long/short head) I:Radius (radial tuberosity) A: shoulder flexion, elbow flexion, forearm supination -two joint muscle Active insufficiency shoulder flexion with elbow flexion

Question 30

What is the origin, insertion and action of the brachioradialis muscle?

Answer 30

O: humerus I: styloid process of radius A: elbow flexion

Question 31

What is the origin, insertion and action of the triceps brachii muscle?

Answer 31

*** 3 origins, 1 insertion**** O: scapula, humerus (2 parts) I: Ulna A: elbow extension - Two joint muscle - Active insufficiency in full shoulder extension and elbow extension

Question 32

What is the origin, insertion and action of the anconeus muscle?

Answer 32

O: lateral epicondyle of humerus I: Ulna A: not a prime mover in any joint action **stabilizer in pronation/supination

Question 33

What is the origin, insertion and action of the Pronator teres muscle?

Answer 33

O: medial epicondyle humerus, ulna I: radius A: pronation; assists in elbow flexion

Question 34

What is the origin, insertion and action of the pronator muscles?

Answer 34

O: ulna I: radius A: forearm pronation

Question 35

What is the origin, insertion and action of thesupinator muscle?

Answer 35

O: lateral epicondyle of humerus I: radius A: forearm supination

Question 36

What is a force couple to move the radius?

Answer 36

- The supinator and bicep muscles work together to move the radius around the ulna. - ANd move radius in forearm supination

Question 37

What are some elbow flexors?

Answer 37

- Brachialis -Brachioradialis | - Biceps Brachii - Wrist flexors

Question 38

What are some elbow extensors?

Answer 38

- Triceps - Anconeus | - Wrist extensors

Question 39

What are some supinators?

Answer 39

- Bicep Brachii | - Supinator

Question 40

What are some pronator muscles?

Answer 40

- Pronator teres | - Pronator quadratus