Advanced Triceps Brachii Quiz

Q1. Which spinal nerve root is primarily assessed by the triceps tendon reflex?

• C5
• C3
• C7
• T1

Q2. Which nerve carries the motor and reflex pathways involved in the triceps tendon reflex?

• Musculocutaneous nerve
• Radial nerve
• Median nerve
• Ulnar nerve

Q3. Why may elbow extension remain partly preserved after a radial nerve lesion in the radial groove?

• Biceps brachii becomes an elbow extensor
• The median nerve supplies the triceps distally
• The triceps does not require nerve supply for extension
• Some triceps innervation arises proximal to the lesion

Q4. A radial nerve lesion in the axilla is more likely than a lesion in the radial groove to cause which triceps-related deficit?

• Loss of forearm pronation only
• Severe weakness of elbow extension
• Loss of elbow flexion only
• Loss of finger adduction only

Q5. The long head of the triceps brachii forms a boundary of which posterior shoulder spaces?

• Femoral triangle and adductor canal
• Quadrangular space, triangular space, and triangular interval
• Cubital tunnel and radial tunnel only
• Carpal tunnel and Guyon canal

Q6. What is the relationship of the long head of triceps to the quadrangular space?

• It forms the lateral boundary
• It passes through the center of the space
• It forms the medial boundary
• It forms the superior boundary

Q7. What is the relationship of the long head of triceps to the triangular space?

• It forms the lateral boundary
• It forms the medial boundary
• It forms the superior boundary
• It does not contribute to the space

Q8. A complete rupture of the distal triceps tendon would most directly impair which action?

• Wrist extension
• Elbow flexion
• Forearm pronation
• Active elbow extension

Q9. Why can the long head of the triceps contribute to stabilization of the glenohumeral joint?

• It forms the glenoid labrum
• It attaches directly to the clavicle
• It passes through the intertubercular sulcus
• It crosses the shoulder joint from its scapular origin

Q10. Which description best summarizes the triceps brachii muscle?

• A radial nerve supplied three-headed posterior arm muscle that primarily extends the elbow
• A median nerve supplied shoulder muscle that primarily abducts the arm
• A musculocutaneous nerve supplied anterior arm muscle that primarily flexes the elbow
• An ulnar nerve supplied forearm muscle that primarily flexes the wrist