Question: where are descending tracts found in the spinal cord
[{'answer': 'lateral corticospinal tract', 'provenance': [{'wikipedia_id': '5134196', 'title': 'Lateral corticospinal tract', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5134196', 'title': 'Lateral corticospinal tract', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 768, 'bleu_score': 0.984188478234951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13973632637738456506}, 'section': 'Section::::Structure.\n'}]}]