Which reflex is associated with nerve roots C5 and C6?

The biceps reflex is associated with the nerve roots C5 and C6. This reflex involves the contraction of the biceps muscle when the biceps tendon, located at the front of the elbow, is tapped with a reflex hammer. The sensory input from this tap is conducted through the C5 and C6 spinal nerves, which control the biceps muscle's action.

In clinical practice, testing the biceps reflex helps assess the integrity of the C5 and C6 nerve roots and can provide valuable information concerning the functioning of the upper arm and associated neurological pathways. The reflex mechanism is particularly useful in identifying neurological deficits or issues within the cervical region.

Other options such as the patellar reflex, ankle reflex, and triceps reflex are associated with different nerve roots and do not involve C5 and C6 specifically. The patellar reflex predominantly involves the L2-L4 nerve roots, the ankle reflex involves the S1-S2 nerve roots, and the triceps reflex is associated with C6-C8. Understanding these associations is crucial for performing the neurological examinations effectively.