Where is the stimulation site for D waves located?

The stimulation site for D waves is located directly caudal to the surgical site. This placement is crucial because D waves are associated with the motor pathways that allow for the assessment of motor function during surgeries, particularly those involving the spinal cord.

By stimulating the area directly caudal to the surgical site, it enables the detection of motor responses that potentially indicate integrity and function of the descending motor tracts. This strategic location helps provide real-time feedback during surgical procedures, ensuring that any manipulation of the spinal cord does not compromise these critical pathways.

In contrast, stimulation sites above the surgical site or at the mid-thoracic level might not accurately reflect the function of the pathways at the level being operated on. Similarly, stimulation near the cranial nerves would not adequately assess the spinal motor pathways and would be unrelated to the goal of monitoring D waves in relation to spinal surgeries. This clarity on the stimulation site is essential for effective intraoperative monitoring and ensuring patient safety.