Muscles Of The Upper Arm

Question 1

What are the 4 muscles of the upper arm?

Answer 1

Bicep brachii, coracobrachialis, brachialis and triceps brachii

Question 2

What nerve innervates the Biceps?

Answer 2

Musculocutaneous

Question 3

What nerve innervates the coracobrachialis?

Answer 3

Musculocutaneous

Question 4

What nerve innervates the brachialis?

Answer 4

Musculocutaneous

With contributions from the radial nerve

Question 5

What artery supplies the bicep brachii?

Answer 5

Branches of Brachial artery

Question 6

What artery supplies the brachialis muscles?

Answer 6

Branches of brachial artery

and radial recurrent artery

Question 7

What artery supplies the coracobrachialis muscle?

Answer 7

Brachial artery

Question 8

What connective tissue sheet is given off as the biceps brachii enter the forearm?

Answer 8

Bicipital aponeurosis

Question 9

What does the bicipital aponeurosis form?

Answer 9

The roof of the cubital fossa and blends with the deep fascia and anterior forearm

Question 10

What are the attachments of the bicep brachii?

Answer 10

Long head- supraglenoid tubercle
Short head- coracoid process
Both heads insert distally into the radial tuberosity and fascia of the forearm via the bicipital aponeurosis

Question 11

What is the function of the bicep brachii?

Answer 11

Supination of the forearm

Flexes the forearm

Question 12

What does the bicep tendon reflex test?

Answer 12

Spinal cord segment C6

Question 13

What are the attachments of the coracobrachialis?

Answer 13

Originates from the coracoid process of the scapula (passes through Axilla) attached to medial side of the humeral shaft (same level as deltoid tubercle)

Question 14

What is the function of the coracobrachialis?

Answer 14

Flexion of the arm at the shoulder

Weak adduction

Question 15

What are the attachments of the brachialis?

Answer 15

Originates from the medial and lateral surfaces of the humeral shaft and inserts into the ulna tuberosity (distal to the elbow joint)

Question 16

What is the action of the brachialis?

Answer 16

Flexion at the elbow

Question 17

Of the two heads which bicep tendon is more likely to rupture?

Answer 17

The long head

Question 18

What are the characteristics of rupture of the bicep tendon?

Answer 18

Popeye sign (when elbow is flexed)

*wont notice much weakness in upper limb due to action of the brachialis and supination muscles

Question 19

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

Answer 19

Tricep brachii

Question 20

Which of the heads of the triceps lies deep?

Answer 20

The medial head

Question 21

What is the arterial supply to the tricep brachii?

Answer 21

Profunda brachii artery

Question 22

What are the 3 heads of the tricep called?

Answer 22

Lateral, long and medial

Question 23

What are the attachments of the tricep brachii?

Answer 23

Long head -Originates from the infraglenoid tubercle
Lateral head- from the humerus, superior to radial groove
Medial head- humerus, inferior to radial groove

All heads converge and tendon inserts into the olecranon of the ulna

Question 24

What is the function of tricep brachii?

Answer 24

Extension of the arm at the elbow

Question 25

What is the innervation of the tricep brachii?

Answer 25

Radial nerve (C7, C8)

Question 26

What does a tap on the tricep tendon test?

Answer 26

The spinal segment C7