Deck 6: Muscles of the Elbow and Radioulnar Joints

Question 1

Which is an action of the biceps brachii?

A)flexion of the hand at the wrist joint
B)supination of the forearm at the radioulnar joints
C)extension of the arm at the glenohumeral joint
D)elevation of the scapula at the scapulocostal joint

Answer 1

B

Question 2

Which are actions of the brachioradialis?

A)flexion of the forearm at the elbow joint and radial deviation (abduction)of the hand at the wrist joint
B)flexion and extension of the forearm at the elbow joint
C)radial deviation (abduction)and ulnar deviation (adduction)of the hand at the wrist joint
D)pronation and supination of the forearm at the radioulnar joints

Answer 2

D

Question 3

Which are the attachments of the pronator teres?

A)lateral supracondylar ridge of the humerus to the styloid process of the radius
B)medial epicondyle of the humerus (via the common flexor tendon)and the coronoid process of the ulna to the lateral radius
C)lateral epicondyle of the humerus (via the common extensor tendon)and the ulnar tuberosity to the lateral radius
D)medial epicondyle of the humerus (via the common flexor tendon)and the coronoid process of the ulna to the radial hand on the anterior side

Answer 3

B

Question 4

Which is an action of the brachioradialis?

A)extension of the arm at the glenohumeral joint
B)flexion of the arm at the glenohumeral joint
C)extension of the forearm at the elbow joint
D)flexion of the forearm at the elbow joint

Question 5

Which are attachments of the biceps brachii?

A)infraglenoid tubercle of the scapula and the acromion process of the scapula to the radial tuberosity
B)supraglenoid tubercle of the scapula and the coracoid process of the scapula to the medial shaft of the humerus
C)distal 1/2 of the anterior shaft of the humerus to the ulnar tuberosity
D)supraglenoid tubercle of the scapula and the coracoid process of the scapula to the radial tuberosity

Question 6

Which are attachments of the brachialis?

A)coracoid process and supraglenoid tubercle of the scapula to the radial tuberosity
B)proximal 1/2 of the anterior shaft of the humerus to the coronoid process of the ulna
C)posterior humerus to the olecranon process of the ulna
D)distal 1/2 of the anterior shaft of the humerus to the ulnar tuberosity

Question 7

If a muscle crosses the radioulnar joints on the posterior side with a horizontal orientation to its fibers,what will its action be?

A)flexion of the forearm at the elbow joint
B)extension of the forearm at the elbow joint
C)pronation of the forearm at the radioulnar joints
D)supination of the forearm at the radioulnar joints

Question 8

Which are the attachments of the anconeus?

A)lateral epicondyle of the humerus to the posterior ulna
B)medial epicondyle of the humerus to the posterior ulna
C)medial condyle of the femur to the proximal posterior fibula
D)lateral sacrum to the greater trochanter of the femur

Question 9

If a muscle crosses the elbow joint posteriorly,what will its action be?

A)flexion of the forearm at the elbow joint
B)extension of the forearm at the elbow joint
C)pronation of the forearm at the radioulnar joints
D)extension of the arm at the glenohumeral joint

Question 10

Which are the attachments of the pronator teres?

A)medial epicondyle of the humerus (via the common flexor tendon)and the medial supracondylar ridge of the humerus and the medial surface of the coronoid process to the proximal 1/3 of the lateral radius
B)lateral epicondyle of the humerus (via the common extensor tendon)and the lateral supracondylar ridge of the humerus to the middle 1/3 of the lateral radius
C)medial epicondyle of the humerus (via the common flexor tendon)and the medial supracondylar ridge of the humerus and the coronoid process to the middle 1/3 of the lateral radius
D)anterior distal 1/4 of the ulna to the anterior distal 1/4 of the radius

Question 11

Which muscles attach onto the radius?

A)pronator teres,flexor carpi radialis,and flexor carpi ulnaris
B)flexor carpi radialis,extensor carpi radialis longus,and extensor carpi radialis brevis
C)anconeus and triceps brachii
D)pronator teres,pronator quadratus,and supinator

Question 12

Which is an action of the triceps brachii?

A)extension of the forearm at the elbow joint
B)flexion of the forearm at the elbow joint
C)abduction of the arm at the glenohumeral joint
D)supination of the forearm at the radioulnar joints

Question 13

Which are the attachments of the supinator?

A)lateral supracondylar ridge of the humerus to the styloid process of the radius
B)medial epicondyle of the humerus (via the common flexor tendon)and the coronoid process of the ulna to the lateral radius
C)medial epicondyle of the humerus and the proximal radius to the proximal 1/3 of the ulna
D)lateral epicondyle of the humerus and the proximal ulna to the proximal 1/3 of the radius

Question 14

If a muscle crosses the elbow joint anteriorly,what will its action be?

A)flexion of the forearm at the elbow joint
B)extension of the forearm at the elbow joint
C)flexion of the arm at the glenohumeral joint
D)dorsiflexion of the foot at the ankle joint

Question 15

Which are actions of the biceps brachii?

A)flexion of the arm at the glenohumeral joint and flexion of the forearm at the elbow joint
B)flexion of the arm at the glenohumeral joint and pronation of the forearm at the radioulnar joints
C)flexion of the forearm at the elbow joint and extension of the arm at the glenohumeral joint
D)supination and pronation of the forearm at the radioulnar joints

Question 16

Which are the attachments of the brachioradialis?

A)lateral supracondylar ridge of the humerus to the styloid process of the radius
B)medial supracondylar ridge of the humerus to the styloid process of the ulna
C)medial epicondyle of the humerus (via the common flexor tendon)to the radial hand on the anterior side
D)lateral epicondyle of the humerus to the styloid process of the radius

Question 17

Which is (are)an action of the biceps brachii?

A)flexion of the forearm at the elbow joint
B)pronation of the forearm at the radioulnar joints
C)flexion of the hand at the wrist joint
D)all of the above

Question 18

Which is an action of the brachialis?

A)supination of the forearm at the radioulnar joints
B)pronation of the forearm at the radioulnar joints
C)flexion of the forearm at the elbow joint
D)extension of the forearm at the elbow joint

Question 19

Which are the attachments of the pronator quadratus?

A)medial epicondyle of the humerus (via the common flexor tendon)and the coronoid process of the ulna to the lateral radius
B)anterior proximal ulna to the anterior proximal radius
C)posterior distal ulna to the anterior distal radius
D)anterior distal ulna to the anterior distal radius

Question 20

Which are attachments of the triceps brachii?

A)infraglenoid tubercle of the scapula and the posterior shaft of the humerus to the olecranon process of the ulna
B)distal 1/2 of the anterior shaft of the humerus to the ulnar tuberosity
C)supraglenoid tubercle of the scapula and the posterior shaft of the humerus to the olecranon process of the ulna
D)infraglenoid tubercle of the scapula and the posterior shaft of the humerus to the ulnar tuberosity

Question 21

Which is an action of the anconeus?

A)pronation of the forearm at the radioulnar joints
B)supination of the forearm at the radioulnar joints
C)extension of the forearm at the elbow joint
D)flexion of the forearm at the elbow joint

Question 22

Which muscle(s)can flex the forearm at the elbow joint?

A)flexor digitorum superficialis
B)flexor carpi radialis
C)extensor carpi radialis longus
D)all of the above

Question 23

Which is an eccentric function of the brachialis?

A)restrains/slows pronation of the forearm at the radioulnar joints
B)restrains/slows supination of the forearm at the radioulnar joints
C)restrains/slows extension of the forearm at the elbow joint
D)restrains/slows flexion of the forearm at the elbow joint

Question 24

Which is true?

A)the long head of the biceps brachii does abduction of the arm at the glenohumeral joint
B)the short head of the biceps brachii does pronation of the forearm at the elbow joint
C)the short head of the biceps brachii does abduction of the arm at the glenohumeral joint
D)the long head of the biceps brachii does adduction of the arm at the glenohumeral joint

Question 25

Which muscles supinate the forearm at the radioulnar joints?

A)pronator teres and supinator
B)biceps brachii and pronator quadratus
C)biceps brachii and supinator
D)pronator teres and pronator quadratus

Question 26

Which are actions of the biceps brachii?

A)flexion of the forearm at the elbow joint and extension of the arm at the glenohumeral joint
B)flexion of the forearm at the elbow joint and supination of the forearm at the radioulnar joints
C)flexion of the forearm at the elbow joint and pronation of the forearm at the radioulnar joints
D)flexion of the forearm at the elbow joint and flexion of the hand at the wrist joint

Question 27

Which muscles pronate the forearm at the radioulnar joints?

A)pronator teres and supinator
B)biceps brachii and pronator quadratus
C)biceps brachii and pronator teres
D)pronator teres and pronator quadratus

Question 28

Which are actions of the pronator teres?

A)pronation of the forearm at the radioulnar joints and extension of the forearm at the elbow joint
B)pronation of the forearm at the radioulnar joints and flexion of the forearm at the elbow joint
C)supination of the forearm at the radioulnar joints and extension of the forearm at the elbow joint
D)supination of the forearm at the radioulnar joints and flexion of the forearm at the elbow joint

Question 29

Which is true?

A)only the long head of the biceps brachii does flexion of the arm at the glenohumeral joint
B)both heads of the biceps brachii pronate the forearm at the radioulnar joints
C)both heads of the biceps brachii flex the arm at the glenohumeral joint
D)only the short head of the biceps brachii flexes the forearm at the elbow joint

Question 30

Which muscle(s)can extend the forearm at the elbow joint?

A)extensor carpi radialis longus
B)extensor carpi radialis brevis
C)extensor carpi ulnaris
D)all of the above

Question 31

Which is an action of the pronator quadratus?

A)pronation of the forearm at the radioulnar joints
B)supination of the forearm at the radioulnar joints
C)flexion of the hand at the wrist joint
D)extension of the hand at the wrist joint

Question 32

Which can flex the forearm at the elbow joint?

A)triceps brachii and biceps brachii
B)supraspinatus and brachialis
C)brachialis and biceps brachii
D)supraspinatus,infraspinatus,teres minor,and subscapularis

Question 33

Which is an action of the supinator?

A)flexion of the hand at the wrist joint
B)pronation of the forearm at the radioulnar joints
C)supination of the forearm at the radioulnar joints
D)extension of the hand at the wrist joint

Question 34

Which is an eccentric function of the triceps brachii?

A)restrains/slows flexion of the forearm at the elbow joint
B)restrains/slows extension of the forearm at the elbow joint
C)restrains/slows adduction of the arm at the glenohumeral joint
D)restrains/slows pronation of the forearm at the radioulnar joints

Question 35

Which is (are)eccentric functions of the biceps brachii?

A)restrains/slows extension of the forearm at the elbow joint
B)restrains/slows supination of the forearm at the radioulnar joints
C)restrains/slows extension of the hand at the wrist joint
D)all of the above

Question 36

Which is an action of the pronator teres?

A)supination of the forearm at the radioulnar joints
B)pronation of the forearm at the radioulnar joints
C)extension of the forearm at the elbow joint
D)flexion of the arm at the glenohumeral joint

Question 37

Which is an action of the pronator teres?

A)flexion of the forearm at the elbow joint
B)extension of the forearm at the elbow joint
C)supination of the forearm at the radioulnar joints
D)extension of the arm at the glenohumeral joint

Question 38

Which is an eccentric function of the brachioradialis?

A)restrains/slows flexion of the arm at the glenohumeral joint
B)restrains/slows extension of the arm at the glenohumeral joint
C)restrains/slows flexion of the forearm at the elbow joint
D)restrains/slows extension of the forearm at the elbow joint

Question 39

If a muscle crosses the elbow joint anteriorly,what joint action can it restrain/slow?

A)extension of the forearm at the elbow joint
B)flexion of the forearm at the elbow joint
C)extension of the arm at the glenohumeral joint
D)plantarflexion of the foot at the ankle joint

Question 40

Which is true?

A)all three heads of the triceps brachii extend the arm at the glenohumeral joint
B)the long head of the triceps brachii adducts and extends the arm at the glenohumeral joint
C)only the medial head of the triceps brachii extends the forearm at the elbow joint
D)none of the above

Question 41

In what position is the brachioradialis most effective as a flexor of the forearm at the elbow joint?

A)when the forearm is halfway between full pronation and full supination at the radioulnar joints
B)when the forearm is in full supination at the radioulnar joints
C)when the forearm is in full pronation at the radioulnar joints
D)none of the above;the amount of pronation/supination of the forearm at the radioulnar joints is irrelevant to the ability of the brachioradialis to perform flexion of the forearm at the elbow joint

Question 42

What muscle is sometimes known as the "hitchhiker muscle?"

A)extensor carpi radialis longus
B)brachioradialis
C)flexor carpi ulnaris
D)palmaris longus

Question 43

What nerve runs between the two heads of the pronator teres?

A)median nerve
B)radial nerve
C)musculocutaneous nerve
D)axillary nerve

Question 44

What nerve innervates the brachialis?

A)median nerve
B)axillary nerve
C)obturator nerve
D)musculocutaneous nerve

Question 45

The humeral head of the pronator teres arises proximally from the medial epicondyle of the humerus as a part of what structure?

A)common flexor tendon
B)common extensor tendon
C)rotator cuff tendon
D)nuchal ligament

Question 46

The "deep head" of the triceps brachii is another name for which head of the triceps brachii?

A)long head
B)lateral head
C)medial head
D)short head

Question 47

Elbow joint flexor muscles whose bellies are located in the anterior arm are innervated by what nerve?

A)median
B)axillary
C)musculocutaneous
D)radial

Question 48

What nerve innervates the pronator teres?

A)median nerve
B)axillary nerve
C)radial nerve
D)ulnar nerve

Question 49

What nerve innervates the triceps brachii?

A)radial nerve
B)common fibular nerve
C)median nerve
D)musculocutaneous nerve

Question 50

Elbow joint extensor muscles are innervated by what nerve?

A)median
B)axillary
C)musculocutaneous
D)radial

Question 51

The anconeus is one of six muscles that arise proximally from what structure?

A)olecranon process of the ulna
B)medial epicondyle of the humerus
C)lateral epicondyle of the humerus
D)deltoid tuberosity of the humerus

Question 52

What nerve innervates the pronator quadratus?

A)median nerve
B)axillary nerve
C)radial nerve
D)ulnar nerve

Question 53

What are the three heads of the triceps brachii?

A)anterior,middle,and posterior
B)long,short,and middle
C)superficial,deep,and long
D)long,medial,and lateral

Question 54

What nerve innervates the anconeus?

A)median nerve
B)axillary nerve
C)radial nerve
D)ulnar nerve

Question 55

What nerve innervates the brachioradialis?

A)median nerve
B)axillary nerve
C)radial nerve
D)ulnar nerve

Question 56

What nerve innervates the biceps brachii?

A)median nerve
B)axillary nerve
C)obturator nerve
D)musculocutaneous nerve

Question 57

Which one of the following muscles can both pronate and supinate the forearm at the radioulnar joints?

A)pronator teres
B)supinator
C)brachioradialis
D)flexor carpi radialis

Question 58

What strong,large muscle accounts for much of the reason that the contour of the biceps brachii is so visible?

A)triceps brachii
B)coracobrachialis
C)brachioradialis
D)brachialis

Question 59

What nerve innervates the supinator?

A)median nerve
B)axillary nerve
C)radial nerve
D)ulnar nerve

Question 60

Why is the "bicipital" groove of the humerus so named?

A)because the tendon of the long head of the biceps brachii runs through it
B)because the tendon of the short head of the biceps brachii runs through it
C)because the belly of the biceps brachii lies over it
D)because the tendon of the short head of the biceps femoris runs through it