What reflex is assessed at spinal levels L2, L3, and L4?

The reflex assessed at spinal levels L2, L3, and L4 is the quadriceps reflex, commonly referred to as the patellar reflex. This reflex is initiated by a tap on the patellar tendon, which is located just below the kneecap. When the tendon is tapped, it stretches the quadriceps muscle, leading to a contraction of this muscle group and resulting in the knee extension. This reflex is a classic assessment used in neurological examinations to evaluate the integrity of the lumbar spine segments L2, L3, and L4.

The other reflexes listed correspond to different spinal levels. For example, the triceps reflex is assessed at the C6-C7 spinal levels, the biceps reflex is evaluated at the C5-C6 levels, and the brachioradialis reflex is tested at the C5-C6 levels as well. Thus, while all these reflexes are important for assessing different regions of the nervous system, the quadriceps reflex specifically targets the lumbar region associated with L2-L4, making it the correct choice for this question.