👉 The thoracoabdominal region is a subregion of the abdominal cavity that includes the thoracic and lumbar regions, as well as the sacrum. It extends from the iliac crest to the sacroiliac joint and from the ilium to the coccyx. The thoracoabdominal region plays an important role in several bodily functions, including digestion, circulation, and sexual function. The thoracic region includes the ribs, sternum, and spine, which are involved