Arm And Elbow

Question 1

Which condyle of the distal humerus articulates with the ulna?

Answer 1

Trochlea

Question 2

Which condyle of the distal humerus articulates with the radius?

Answer 2

Capitulum

Question 3

What type of joint is the elbow joint?

Answer 3

Synovial; hinge

Question 4

What three fossae on the distal humerus prevent excessive flexion and extension?

Answer 4

Olecranon fossa (extension), radial and coronoid fossae (flexion)

Question 5

What are the stabilizing ligaments of the elbow joint?

Answer 5

Ulnar collateral, radial collateral and annular ligaments

Question 6

Which muscles are part of the anterior compartment of the brachium?

Answer 6

Biceps brachii, coracobrachialis and brachialis

Question 7

What are the attachments of biceps brachii?

Answer 7

SH: Coracoid process to radial tuberosity
LH: Supraglenoid tubercle of scapula and intertubercular groove of humerus to radial tuberosity

Question 8

What are the functions of the biceps brachii?

Answer 8

Elbow flexion, supination

Question 9

What are the attachments of coracobrachialis?

Answer 9

Coracoid process to anterior/medial shaft of humerus

Question 10

What is the function of the coracobrachialis?

Answer 10

Flexion, weak adduction and medial rotation of glenohumeral joint

Question 11

What are the attachments of brachialis?

Answer 11

Anterior/medial shaft of humerus to ulnar tuberosity

Question 12

What is the function of the brachialis?

Answer 12

Flexion of the elbow joint

Question 13

What is the motor innervation of the anterior arm?

Answer 13

Musculocutaneous nerve

Question 14

What is the sensory innervation of the anterior arm?

Answer 14

Single brachial plexus nerve

Question 15

Which muscles make up the posterior compartment of the brachium?

Answer 15

Triceps brachii, anconeus

Question 16

What are the attachments of triceps brachii?

Answer 16

LH: Infraglenoid tubercle of scapula to olecranon process
M/LaH: posterior shaft of humerus to olecranon process

Question 17

What are the functions of the triceps brachii?

Answer 17

Extension of the elbow, adduction and extension of glenohumeral joint from long head only

Question 18

What are the attachments of anconeus?

Answer 18

Posterior aspect of lateral epicondyle of humerus to olecranon process

Question 19

What is the function of the anconeus?

Answer 19

Elbow extension and stabilization

Question 20

What gives motor innervation to the posterior arm?

Answer 20

Radial nerve

Question 21

What nerve gives sensory information to the posterior arm?

Answer 21

Single brachial plexus nerve

Question 22

Which blood vessel supplies the posterior arm and the anterior arm?

Answer 22

Brachial artery (anterior) and deep brachial artery (posterior)

Question 23

What borders the cubital fossa laterally and medially?

Answer 23

Brachioradialis (lateral), pronator teres (medial)

Question 24

What are the roof, floor and superior border of cubital fossa?

Answer 24

Roof: Bicipital aponeurosis
Floor: Brachialis
Superior border: Above humeral epicondyles

Question 25

What are the contents of the cubital fossa?

Answer 25

Tendon of biceps brachii, brachial artery, median nerve