Compartments of the arm

Question 1

Which muscles are in the anterior compartment of the arm?

Answer 1

Coracobrachialis

Brachialis

Biceps brachii

Question 2

Where is the origin of the coracobrachialis?

Answer 2

Coracoid process

Question 3

Where is the insertion of the coracobrachialis?

Answer 3

Midway down humerus on medial aspect

Question 4

What is the function of the coracobrachilais?

Answer 4

Adducts shoulder

-letting you hold things underarm

Question 5

Which nerve supplies the coracobrachialis?

Answer 5

Musculocutaneous

Question 6

Where is the origin of the long head of the biceps brachiii?

Answer 6

Supraglenoid tubercle of scapula

Question 7

Where is the origin of the short head of the biceps brachii?

Answer 7

Coracoid process

Question 8

Where is the insertion of the biceps brachii?

Answer 8

Heads join together at mid humerus

common tendon in radial (bicipital) tuberosity

Question 9

What is the function of the biceps brachii?

Answer 9

Supinator of forearm when elbow is flexed

Elbow flexor when forearm is supinated

At shoulder it acts to stabilise humeral head within glenoid and is a weak flexor

Question 10

Which nerve supplies the biceps brachii?

Answer 10

Musculocutaneous

Question 11

Where is the origin of the brachialis?

Answer 11

Distal half of the anterior humeral shaft

Medial intermuscular septum

Question 12

Where is the insertion of the brachialis?

Answer 12

Converges distally to form tendon that inserts into coronoid process of ulna

Question 13

What is the function of the brachialis?

Answer 13

Main flexor of elbow

Question 14

Which nerve supplies the brachialis?

Answer 14

Musculocutaneous

Question 15

Which muscle is found in the posterior compartment of the forearm?

Answer 15

Triceps brachii (3 heads)

Question 16

Where is the origin of the long head of the triceps brachii?

Answer 16

Infraglenoid tubercle of scapula

Question 17

Where is the origin of the lateral head of the triceps brachii?

Answer 17

Lateral lip of spiral groove above deltoid tuberosity

Question 18

Where is the origin of the medial head of the tricep s brachii?

Answer 18

Medial aspect of the spiral groove of the humerus

Question 19

Where is the insertion of the long head of the triceps brachii?

Answer 19

Posterosuperior aspect of olecranon

same as lateral head

Question 20

Where is the insertion of the lateral head of the triceps brachii?

Answer 20

Posterosuperior aspect of olecranon

same as long head

Question 21

Where is the insertion of the medial head?

Answer 21

Olecranon

-some fibres insert into capsule of elbow joint

Question 22

What is the function of the triceps brachii?

Answer 22

Stabilises shoulder joint

Extensor of elbow joint

Aids extension of shoulder

Question 23

Which nerve supplies the triceps brachii?

Answer 23

Radial

Question 24

What is the path taken by the musculocutaneous nerve?

Answer 24

Arises from lateral cord of brachial plexus

Perforates and supplies coracobrachialis

Passes to the lateral aspect of the arm between biceps brachii and brachialis

Becomes lateral cutaneous nerve of the forearm just above the elbow

Question 25

Does the median nerve give branches to the arm?

Answer 25

No

Question 26

Where is the medial cutaneous nerve of the arm located and what does it supply?

Answer 26

Pierces deep fascia in superior part of arm to supply the skin on the anterior and medial aspects

Question 27

Where is the medial cutaneous nerve of the forearm located and what does it supply?

Answer 27

Pierces deep fascia on the medial aspect of the arm with the basilic vein. It supplies the skin over the inferior part of the arm, then passes into the medial side of the forearm

Question 28

The brachial artery is a continuation of which other vessel?

Answer 28

The axillary artery

Question 29

Where does the brachial artery start?

Answer 29

Lower border of teres major

Question 30

Where does the brachial artery end? What does it divide into?

Answer 30

Distal to the radius at the level of the neck of the radius Radial and ulnar arteries

Question 31

Where does the brachial artery run?

Answer 31

Along medial border of the coracobrachialis and biceps brachii accompanied by the venae commitantaes

Question 32

What are the branches of the brachial artery?

Answer 32

Profunda brachii artery Nutrient branches to the humerus Superior ulnar collateral artery Inferior ulnar collateral artery Muscular branches

Question 33

Where does the profunda brachii artery run?

Answer 33

Posterolaterally with the radial nerve in the spiral groove of the humerus

Question 34

Which structure does the superior ulnar collateral artery accompany?

Answer 34

Ulnar nerve

Question 35

Which muscles are supplied by the muscular branch of the brachial artery?

Answer 35

Biceps brachii, brachialis and coracobrachialis

Question 36

What is another term for deep veins? What is their function?

Answer 36

Venae commitantaes Accompany main arteries (usually paired) Communicate with superficial veins

Question 37

Where does blood in the radial and ulnar veins flow to in the upper limb?

Answer 37

Radial and ulnar veins unite to form the brachial veins After receiving tributaries from corresponding braches of the brachial artery they form the axillary vein at the lower border of teres major Joined by basilic vein

Question 38

Describe the path taken by the radial nerve from the brachial plexus to supply the arm

Answer 38

Arises from the posterior cord of the brachial plexus Lies posterior to the axillary and brachial arteries Winds between the lateral and medial heads of the triceps in the spiral groove with the profunda brachii artery Braches given off to supply each head proximal to the part that is being innervated

Question 39

How does the radial nerve leave the arm?

Answer 39

Pierces the lateral intermuscular septum to reach the cubital fossa where it lies between the brachialis and brachioradialis