1. To date, there is no consensus on the essential diagnostic criteria for diagnosing a myofascial trigger point:
2. According to the DC/TMD diagnostic criteria, pain of muscle origin spreading upon palpation but within the muscle boundary is considered:
3. The mechanical effect of dry needling and trigger point injections may activate the endogenous opioid system:
4. Which of the following algogenic substances have been used to induce experimental muscle pain:
5. The palpation pressure recommended by DC/TMD to elicit muscle pain spreading or referral is: