Biceps Brachii Flashcards

Explore the two heads of biceps brachii, their attachments, nerve supply, actions, anatomical relations, and clinical importance.

Card 1 of 25Question

Which compartment of the arm contains the biceps brachii muscle?

The anterior compartment of the arm.

In This Section

1. Which compartment of the arm contains the biceps brachii muscle?

The anterior compartment of the arm.

2. How many heads does the biceps brachii normally have?

Two heads, a long head and a short head.

3. Where does the long head of the biceps brachii originate?

The supraglenoid tubercle of the scapula and adjacent superior glenoid labrum.

4. Where does the short head of the biceps brachii originate?

The tip of the coracoid process of the scapula.

5. Which muscle shares an origin with the short head of the biceps brachii?

The coracobrachialis muscle.

6. Where does the main distal tendon of the biceps brachii insert?

The radial tuberosity of the radius.

7. What is the bicipital aponeurosis?

A fibrous expansion of the distal biceps tendon that blends with the antebrachial fascia.

8. Which forearm muscle is crossed superficially by the bicipital aponeurosis?

The pronator teres muscle.

9. Which nerve supplies the biceps brachii?

The musculocutaneous nerve.

10. Which spinal nerve roots primarily contribute to the innervation of biceps brachii?

C5 and C6.

11. Which artery primarily supplies blood to the biceps brachii?

Muscular branches of the brachial artery.

12. What are the two principal actions of biceps brachii at the elbow and forearm?

Elbow flexion and forearm supination.

13. In which forearm position is the biceps brachii especially effective at flexing the elbow?

With the forearm supinated.

14. What is the main rotational action of biceps brachii on the forearm?

Supination, rotating the radius to turn the palm anteriorly or upward.

15. What action does biceps brachii assist with at the shoulder joint?

Flexion of the arm at the shoulder.

16. Through which groove does the tendon of the long head of biceps brachii pass?

The intertubercular groove of the humerus.

17. What is the relationship of the long head of biceps brachii tendon to the glenohumeral joint?

It is intracapsular but extrasynovial.

18. Which structure helps stabilize the long head of the biceps tendon near the intertubercular groove?

The biceps pulley complex, including the superior glenohumeral and coracohumeral ligaments.

19. Which muscle lies deep to biceps brachii in the anterior arm?

The brachialis muscle.

20. Which two structures form the medial and lateral boundaries of the cubital fossa proximally?

Pronator teres medially and brachioradialis laterally.

21. Which structure forms part of the superior boundary of the cubital fossa?

An imaginary line connecting the medial and lateral epicondyles of the humerus.

22. How is the biceps tendon positioned relative to the brachial artery in the cubital fossa?

The biceps tendon lies lateral to the brachial artery.

23. Which deep tendon reflex evaluates the biceps brachii and primarily the C5 spinal segment?

The biceps tendon reflex.

24. What characteristic deformity can follow rupture of the proximal long head of biceps brachii?

A Popeye deformity caused by distal retraction of the muscle belly.

25. Which movement is particularly weakened after a complete distal biceps tendon rupture?

Forearm supination, especially against resistance.