Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

Which vertebral levels correlate with general gastrointestinal structures?

1. T10-L1

2. L1-L2

3. T12

4. T8-T10

The correct answer is: T10-L1

The correct association of vertebral levels with general gastrointestinal structures is primarily found in the range from T10 to L1. This area corresponds to the sympathetic innervation of the abdominal organs, which includes portions of the gastrointestinal tract. The spinal segments from T10 to L1 are critical for the sympathetic nervous system, providing innervation to abdominal organs through the celiac and superior mesenteric ganglia. For example, structures such as the stomach, small intestine, and parts of the large intestine receive sympathetic stimuli from these thoracic and lumbar levels, facilitating various digestive and metabolic processes. As the sympathetic fibers descend, they pass through the diaphragm and contribute to the autonomic regulation necessary for gastrointestinal function. Other options may refer to specific vertebral levels that relate to certain organs, but do not encompass the general overview of gastrointestinal innervation. For instance, L1-L2 is more localized and may involve structures such as the lower part of the intestines rather than the entire digestive system. T12 is isolated and does not capture the breadth of GI structures. The T8-T10 range is also limited and does not address the full extent of the sympathetic innervation required for gastrointestinal functions. Thus, T10 to L1 effectively conveys the range relevant to the