Final answer:
The nurse should tap the tendon at the front of the elbow, which attaches the biceps brachii muscle to the radius, to elicit the bicep reflex, assessing the C5-C6 nerve roots.
Step-by-step explanation:
To elicit the bicep reflex, a nurse should tap the tendon that attaches the biceps brachii muscle to the radius bone, which is located in the anterior (front) part of the elbow. This is not the triceps, brachioradialis, patellar, or Achilles. In the context of a neurological exam, deep tendon reflexes, like the bicep reflex, help assess the integrity of the lower motor neurons and the reflex arc. It specifically assesses the C5-C6 nerve roots. When the biceps tendon is tapped, the forearm should show a slight reflexive flexion.