Anterior compartment of the arm

Question 1

Name the origin of coracobrachialis

Answer 1

Apex of the coracoid process

Question 2

Name the insertion of coracobrachialis

Answer 2

Linear roughening on the midshaft of the humerus on the medial side

Question 3

Which nerve innervates coracobrachialis?

Answer 3

Musculocutaneous nerve (C5,C6)

Question 4

What is the function of coracobrachialis?

Answer 4

Flexor of the arm at the glenohumeral joint

Question 5

Name the origin of each head of biceps brachii

Answer 5

Long head: Supraglenoid tubercle of the scapula

Short head: Apex of the coracoid process

Question 6

Name the insertion of biceps brachii

Answer 6

Radial tuberosity

Question 7

Which nerve innervates biceps brachii?

Answer 7

Musculocutaneous nerve (C5,C6,C7)

Question 8

What is the function of biceps brachii?

Answer 8

Powerful flexor of the forearm at the elbow joint

Supinator of the forearm

Accessory flexor of the arm at the glenohumeral joint

Question 9

Name the origin of brachialis

Answer 9

Distal half of the anterior aspect of the humerus (medial and lateral surfaces)

and adjacent intermuscular septae (these aponeurotic sheets run transversely to separate anterior and posterior compartments)

Question 10

Name the insertion of brachialis

Answer 10

Tuberosity of the ulna

Question 11

What is the innervation to brachialis?

Answer 11

Musculocutaneous nerve (C5,C6)

Small contrubution by radial nerve (C7) to lateral part of the muscle

Question 12

What artery does the brachail artery follow from?

And at what muscle border?

Answer 12

Axillary artery

Inferior border of teres major

Question 13

Where does the brachial artery end?

Answer 13

Just distal to the elbow joint

Question 14

What does the brachial artery divide into?

Answer 14

Radial and ulnar arteries

Question 15

Name the branches of the brachial artery

Answer 15

Profunda brachii artery

Has branches to radial and middle colateral arteries

Muscular branches

Superior and inferior ulnar colateral arteries

Nutrient arteries (to bone e.g. humerus)

Question 16

What muscle does the musculocutaneous nerve enter the arm through?

Answer 16

Coracobrachialis

Question 17

What muscles sandwich the musculocutaneous nerve?

Answer 17

Biceps brachii and brachialis

Question 18

What does the musculocutanous nerve bcome?

Lateral to which tendon?

Answer 18

Lateral cutaneous nerve of the forearm

Emerges at the elbow lateral to the biceps tendon

Question 19

What motor innervation does the musculocutaneous nerve supply?

Answer 19

All muscles in the anterior compartment of the arm

Question 20

What cutaneous innervation does the musculocutaneous nerve supply?

Answer 20

Skin on the lateral surface of the forearm

Question 21

Which nerve passes down the medial side of the arm and is associated with the brachial artery?

Answer 21

Median nerve

Question 22

What are the branches of the median nerve in the arm?

Answer 22

There aren’t any

Question 23

Which nerve enters the arm with the axillary artery and the median nerve?

Answer 23

Ulnar nerve

Question 24

In the middle of the arm, the medial nerve penetrates what to enter the posterior compartment?

Answer 24

Intermuscular septum

Question 25

What does the medial nerve pass before entering the anterior compartment of the forearm?

Answer 25

It passes posterior to the medial epicondyle of the humerus

Question 26

What are the branches of the ulnar nerve in the arm?

Answer 26

There aren’t any