Arm and Elbow

Question 1

What part of humerus articulates with radius

Answer 1

capitulum (condyle)

Question 2

What part of humerus articulates with ulna

Answer 2

trochlea (condyle)

Question 3

Label

Answer 3

• A:Coronoid fossa
• Unlettered: Radial fossa
• B: lateral epicondyle
• C: capitulum (condyle)
• D: medial supraepicondylar ridge
• E: medial epicondyle
• F: trochlea (condyle)
• G: lateral supraepicondylar ridge
• H: olecranon fossa

Question 4

label

Answer 4

Question 5

4 elbow articulations

Answer 5

1. humeroulnar
2. humeroradial
3. proximal radioulnar
4. distal radioulnar

Question 6

humeroulnar is a ____ joint for _____

Answer 6

hinge, flexion/extension

Question 7

humeroradial is a ____ joint for _____

Answer 7

modified hinge, flexion/extension and supination/pronation

Question 8

proximal radioulnar is a ____ joint for _____

Answer 8

pivot, supination/pronation

Question 9

distal radioulnar is a ____ joint for _____

Answer 9

pivot, supination/pronation

Question 10

what is the purpose of the annular ligament?

Answer 10

• encircles head of radius
• holds head of radius against ulna
• protects against distal dislocation of radius

Question 11

what is lateral collateral ligament purpose

Answer 11

• lateral epicondyle to annular ligament of radius
• protects against medial deviation of forearm
• taut in full extension

Question 12

medial collateral ligament purpose

Answer 12

• medial epicondyle of humerus to coronoid process and olecranon process
• protects against lateral deviation of forearm

Question 13

What is Tommy John surgery

Answer 13

Ulnar colalteral ligament (UCL) reconstruction

UCL replaced with tendon from elsewhere in body

Question 14

What happens at the elbow during supination?

Answer 14

radial head spins on capitulum

includes humeroradial joint, proximal and distal radioulnar joints

Question 15

muscles acting on elbow (posterior & anterior)

Answer 15

• Anterior:
  
  • biceps brachii
  • brachialis
• Posterior:
  
  • triceps brachii
  • anconeus
  • brachioradialis

Question 16

attachments of biceps brachii

Answer 16

• Short head: coracoid process of scapula
• Long head: supraglenoid tubercle
• Both: radius via bicipital aponeurosis

Question 17

action of biceps brachii

Answer 17

flexes elbow and humerus, supinates the forearm

Question 18

innervation of biceps brachii

Answer 18

musculocutaneous nerve

Question 19

Brachialis attachments

Answer 19

distal, anterior humerus

coronoid process of ulna

Question 20

action of brachialis

Answer 20

flexes the forearm

Question 21

innervation of brachialis

Answer 21

musculocutaneous nerve

Question 22

triceps brachii attachments

Answer 22

• long head: infraglenoid tubercle
• lateral head: posterior superior humerus
• medial head (deep): posterior inferior humerus
• All: olecranon of ulna

Question 23

innervation of triceps brachii

Answer 23

radial nerve

Question 24

anoconeus attachments

Answer 24

lateral epicondyle of humerus

olecranon of ulna

Question 25

action of anoconeus

Answer 25

extends the forearm

Question 26

innervation of anoconeus

Answer 26

radial nerve

Question 27

brachioradialis attachments

Answer 27

lateral portion of distal humerus lateral, distal radius

Question 28

action of brachioradialis

Answer 28

flexes elbow

Question 29

innervation of brachioradialis

Answer 29

radial nerve

Question 30

supinator attachments

Answer 30

lateral epicondyle of humerus and proximal ulna proximal radius

Question 31

action of supinator

Answer 31

supinates forearm

Question 32

innervation of supinator

Answer 32

radial nerve

Question 33

list muscles acting of radioulnar joints

Answer 33

1. supinator 2. biceps brachii 3. pronator teres 4. pronator quadratus

Question 34

pronator teres attachments

Answer 34

coronoid process and medial epicondyle lateral surface of radius

Question 35

action of pronator teres

Answer 35

pronates and flexes forearm

Question 36

innervation of pronator teres

Answer 36

median nerve

Question 37

attachments of pronator quadratus

Answer 37

distal anterior ulna distal anterior radius

Question 38

action of pronator quadtatus

Answer 38

pronates forearm

Question 39

innervation of pronator quadratus

Answer 39

median nerve