The correct answer is option 4: Splanchnology. Splanchnology is the study of the organs within the body cavities, especially the visceral or internal organs. It focuses on understanding the structure, function, and diseases of organs such as the heart, lungs, liver, and intestines.
Option 1, Angiology, is the study of blood vessels and the lymphatic system. Option 2, Arthrology, is the study of joints. Option 3, Anthrology, does not exist as a field of study and may be a typo.
In summary, splanchnology is the specifically focused study of visceral organs within the body, making it the correct answer.