Arm and Cubital Fossa

Question 1

What are the muscles of the arm divided into?

Answer 1

Anterior and Posterior compartments

Question 2

What do the muscles of the anterior compartment of the arm do?

Answer 2

Flexors of arm and elbow

Question 3

What nerve innervates the muscles of the anterior compartment of the arm?

Answer 3

Musculocutaneous

Question 4

What muscles are situated in the anterior compartment of the arm?

Answer 4

Biceps Brachii
Brachialis
Coracobrachialis

Question 5

What are the attachments of the biceps brachii?

Answer 5

Long head - supraglenoid tubercle of scapula
Short head - coracoid process

Insert into radial tuberosity

Question 6

What are the actions of the biceps brachii?

Answer 6

• Supination and flexion of elbow (when supine)
• Long head prevents the head of the humerus moving superiorly and short head resists dislocation
• Weak flexion of arm

Question 7

What is the most powerful supinator of the forearm?

Answer 7

Biceps Brachii

Question 8

What muscle is highlighted and what is its innervation?

Answer 8

Biceps Brachii

Musculocutaneous (C5-6)

Question 9

What nerve pierces the coracobrachialis?

Answer 9

Musculocutaneous nerve

Question 10

What are the attachments of coracobrachilais?

Answer 10

Origin- coracoid process of scapula

Insertion- medial mid-shaft of humerus

Question 11

What are the actions of coracorachialis?

Answer 11

Flexion of arm and assists with adduction

Question 12

What is this muscle and its innervation?

Answer 12

Coracobrachialis

Musculocutaneous nerve

Question 13

What are the attachments of brachialis?

Answer 13

Origin - Distal half of the anterior surface of the humerus

Insertion - Ulnar tuberosity and coronoid process

Question 14

What is the role of brachialis?

Answer 14

Flexion of elbow

Question 15

What is the most powerful elbow flexor?

Answer 15

Brachialis

Question 16

What is this muscle and its innervation?

Answer 16

Brachialis

Musculocutaneous (small component of lateral fibres from radial nerve)

Question 17

What muscle is situated in the posterior compartment of the arm?

Answer 17

Triceps Brachii

Question 18

What is this muscle and its innervation?

Answer 18

Triceps Brachii

Radial nerve

Question 19

What are the attachments of the triceps brachii?

Answer 19

Long head - infraglenoid tubercle of scapula
Medial head - posterior surface of shaft of humerus (inf. to radial groove)
Lateral head - humerus (sup. to radial groove)

Insertion - olecranon of ulna

Question 20

What are the actions of triceps brachii?

Answer 20

Extension of elbow

Long had resists dislocation

Question 21

Where does the brachial artery divide into its terminal branches?

Answer 21

In or close to the cubital fossa

Divides into radial and ulnar branches

Question 22

Which artery forms a common interosseous branch?

Answer 22

Ulna

Common branch then gives off anterior and posterior interosseous branches to supply deep structures of the forearm

Question 23

What do the radial and ulnar nerves pass through to reach the forearm?

Answer 23

Radial - lateral intermuscular septum

Ulnar - medial intermuscular septum

Question 24

What is highlighted?

Answer 24

Humerus - medial epicondyle

Question 25

What is highlighted?

Answer 25

Medial epicondyle of humerus

Question 26

What is highlighted?

Answer 26

Humerus - lateral epicondyle

Question 27

What is highlighted?

Answer 27

Trochlea of humerus

Question 28

What is highlighted?

Answer 28

Humerus - Capitulum

Question 29

What is highlighted?

Answer 29

Coronoid fossa of humerus

Question 30

What is highlighted?

Answer 30

Olecranon fossa of humerus

Question 31

What are the boundaries of the cubital fossa?

Answer 31

Lateral - Brachioradialis Medial - Pronator teres Roof - Skin, fascia, biceptial aponeurosis Floor - Brachialis

Question 32

What is the communication between the basilic and cephalic veins?

Answer 32

Communicate via the median cubital vein in the cubital fossa

Question 33

What does the cephalic vein drain?

Answer 33

Lateral side of the dorsum of the hand, passes along the roof of the anatomical snuffbox, then runs up lateral side of forearm to cubital fossa

Question 34

What does the basilic vein drain?

Answer 34

Medial side of the dorsum of the hand and medial forearm before reaching the cubital fossa

Question 35

What is the contents of the cubital fossa?

Answer 35

Medial to Lateral - Median nerve - bifurcation of brachial artery into ulnar and radial arteries - tendon of biceps

Question 36

What type of joint is the elbow?

Answer 36

Synovial hinge

Question 37

True or False? | The ulna moves during pronation

Answer 37

False! | The radial head moves around the rounded capitulum of the humerus in pronation and supination

Question 38

What facilitates the rotation of the radius around the humerus in pronation and supination?

Answer 38

Annular ligament

Question 39

What is being highlighted?

Answer 39

Annular ligament

Question 40

What prevents adduction and abduction of the elbow?

Answer 40

Medial and lateral collateral ligaments

Question 41

What is highlighted?

Answer 41

Lateral (radial) collateral ligament

Question 42

What is highlighted and what are its parts?

Answer 42

Medial (ulnar) collateral ligament | - Posterior, anterior and oblique bands

Question 43

What is highlighted?

Answer 43

Head of radius

Question 44

What is highlighted?

Answer 44

Radial tuberosity

Question 45

What is highlighted?

Answer 45

Styloid process of radius

Question 46

What is highlighted?

Answer 46

Styloid process of ulna

Question 47

What is highlighted?

Answer 47

Trochlear notch of ulna

Question 48

What is highlighted?

Answer 48

Coronoid process of ulna