arm & elbow

Question 1

List the condyles of the humerus

Answer 1

Capitulum

Trochlear

Question 2

List the epicondyles of the humerus and function

Answer 2

Medial
lateral
-primary site of muscle attachment

Question 3

List the three fossa of the humerus

Answer 3

Olecranon
coronoid
radial

Question 4

Humeroulnar articulation( type and action)

Answer 4

hinge

flexion and extension

Question 5

humeroradial articulation(type and action)

Answer 5

modified hinge

• flexion/extension
• supination/pronation

Question 6

proximal radioulnar (type and action)

Answer 6

pivot

supination/pronation

Question 7

distal radioulnar (type and action)

Answer 7

pivot supination/pronation

Question 8

Annular ligament

Answer 8

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

Question 9

Lateral collateral ligament

Answer 9

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

Question 10

medial collateral ligament

Answer 10

Medial epicondyle of humerus to coronoid process and olecranon process

Question 11

what structures are close in extension?

Answer 11

Olecranon process is close to the distal humerus in the olecranon fossa

Question 12

what structures are close in flexion?

Answer 12

Coronoid process and radius approach their respective fossa

Question 13

what happens in supination and what is included?

Answer 13

radial head spins on the capitulum

• humeroradial joint
• proximal and distal radioulnar joints

Question 14

What are the muscles acting on the elbow in the anterior compartment and what innervates them?

Answer 14

biceps brachii
brachialis
-Musculocutaneous nerve

Question 15

What are the muscles acting on the elbow in the posterior compartment and what innervates them?

Answer 15

triceps
anconeus
brachioradialis
-Radial nerve

Question 16

Biceps brachii(attachments)

Answer 16

• Short head: coracoid process of the scapula
• long head: supraglenoid tubercle
• both heads: radius via bicipital aponeurosis

Question 17

Biceps brachii(action and innervation)

Answer 17

flexes elbow
supinates the forearm
-musculocutaneous nerve

Question 18

Brachialis(attachments)

Answer 18

distal anterior humerus

coronoid process of the ulna

Question 19

Brachialis(action and innervation)

Answer 19

Flexes forearm

-Musculocutaneous nerve

Question 20

Triceps brachii(attachments)

Answer 20

Long head: intfraglenoid tubercle
lateral head: posterior inf. humerus
Medial head: posterior inf humerus
all heads: olecranon of the ulna

Question 21

Triceps brachii(action and innervation)

Answer 21

Extend elbow

-radial nerve

Question 22

Anoconeus(attachments)

Answer 22

Lateral epicondyle of humerus

olecranon of ulna

Question 23

Anoconeus(action and innervation)

Answer 23

extends the forearm

radial nerve

Question 24

brachioradialis (attachments)

Answer 24

Lateral portion of distal humerus

-lateral, distal radius

Question 25

Brachioradialis (action and innervation)

Answer 25

flexes elbow

radial nerve

Question 26

Supinator(attachments)

Answer 26

lateral epicondyle of humerus and proximal ulna

proximal radius

Question 27

Supinator(action and innervation)

Answer 27

supinates forearm

-radial nerve

Question 28

What are the muscles acting on the radioulnar joint?

Answer 28

Biceps brachii
pronator teres
pronator quadratus

Question 29

Pronator Teres(attachments)

Answer 29

cornoid process and medial epicondyle

-lateral surface of radius

Question 30

Pronator teres (action and innervation)

Answer 30

pronates and flexes forearm

median nerve

Question 31

pronator quadratus(attachments)

Answer 31

Distal anterior ulna

distal anterior radius

Question 32

pronator quadratus(action and innrvation)

Answer 32

pronates forearm

median nerve