Question: where are trigger points located in the body
[{'answer': 'muscles', 'provenance': [{'wikipedia_id': '1626362', 'title': 'Myofascial trigger point', 'start_paragraph_id': 11, 'start_character': 354, 'end_paragraph_id': 11, 'end_character': 361, 'bleu_score': 1.0, 'section': 'Section::::Pathophysiology.\n'}]}, {'answer': 'in the fascia surrounding skeletal muscle'}, {'answer': 'hyperirritable spots in the fascia surrounding skeletal muscle'}, {'provenance': [{'wikipedia_id': '1626362', 'title': 'Myofascial trigger point', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 631, 'bleu_score': 0.9415674898824081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9468904525218410195}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1626362', 'title': 'Myofascial trigger point', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 982, 'bleu_score': 0.694107313399525, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9468904525218410195}, 'section': 'Section::::Pathophysiology.\n'}]}, {'provenance': [{'wikipedia_id': '1626362', 'title': 'Myofascial trigger point', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9468904525218410195}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1626362', 'title': 'Myofascial trigger point', 'section': 'Section::::Pathophysiology.\n', 'start_paragraph_id': 11, 'end_paragraph_id': 11, 'meta': {'evidence_span': ['Activation of trigger points may be caused by a number of factors, including acute or chronic muscle overload, activation by other trigger points (key/satellite, primary/secondary), disease, psychological distress (via systemic inflammation), homeostatic imbalances, direct trauma to the region, collision trauma (such as a car crash which stresses many muscles and causes instant trigger points) radiculopathy, infections and health issues such as smoking.', 'Activation of trigger points may be caused by a number of factors, including acute or chronic muscle overload, activation by other trigger points (key/satellite, primary/secondary), disease, psychological distress (via systemic inflammation), homeostatic imbalances, direct trauma to the region, collision trauma (such as a car crash which stresses many muscles and causes instant trigger points) radiculopathy, infections and health issues such as smoking.']}}]}, {'provenance': [{'wikipedia_id': '1626362', 'title': 'Myofascial trigger point', 'section': 'Section::::Diagnosis.\n', 'start_paragraph_id': 15, 'end_paragraph_id': 15, 'meta': {'evidence_span': ['Usually there is a taut band in muscles containing trigger points', 'Practitioners do not agree on what constitutes a trigger point, but the assessment typically considers symptoms, pain patterns and manual palpation. Usually there is a taut band in muscles containing trigger points, and a hard nodule can be felt. Often a twitch response can be felt in the muscle by running your finger perpendicular to the muscle\'s direction; this twitch response often activates the "all or nothing" response in a muscle that causes it to contract. Pressing on an affected muscle can often refer pain. Clusters of trigger points are not uncommon in some of the larger muscles, such as the gluteus group (gluteus maximus, gluteus medius, and gluteus minimus). Often there is a heat differential in the local area of a trigger point.', 'Practitioners do not agree on what constitutes a trigger point, but the assessment typically considers symptoms, pain patterns and manual palpation.']}}]}, {'provenance': [{'wikipedia_id': '1626362', 'title': 'Myofascial trigger point', 'section': 'Section::::Pathophysiology.\n', 'start_paragraph_id': 12, 'end_paragraph_id': 12, 'meta': {'evidence_span': ['Trigger points form only in muscles', '(via systemic inflammation), homeostatic imbalances, direct trauma to the region, collision trauma (such as a car crash which stresses many muscles and causes instant trigger points) radiculopathy, infections and health issues such as smoking. Trigger points form only in muscles. They form as a local contraction in a small number of muscle fibers in a larger muscle or muscle bundle. These in turn can pull on tendons and ligaments associated with the muscle and can cause pain deep within a joint where there are no muscles. The integrated hypothesis theory states that trigger points form from excessive release of acetylcholine which produces sustained depolarization of muscle fibers. Indeed, the trigger point has an abnormal biochemical composition with elevated concentrations of acetylcholine, noradrenaline and serotonin and a lower pH. These sustained contractions of muscle sarcomeres compresses local blood supply restricting the energy needs of the local region. This crisis of energy produces sensitizing substances that interact with some nociceptive (pain) nerves traversing in the local region which in turn can produce localized pain within the muscle at the neuromuscular junction (Travell and Simons 1999).', 'Trigger points form only in muscles.']}}]}]