American Academy of Professional Coders (AAPC) Practice Exam

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Which of the following does NOT belong to the five types of body cavities?

Cranial cavity
Thoracic cavity
Pelvic cavity
Internal cavity

The correct answer is: Internal cavity

The five main types of body cavities are essential for organizing the human body's structures and systems. The cranial, thoracic, abdominal, pelvic, and spinal cavities are all recognized anatomical spaces housing vital organs and structures. The cranial cavity protects the brain, while the thoracic cavity contains the heart and lungs, and the pelvic cavity houses reproductive organs and the lower part of the digestive tract. The internal cavity, however, is not a recognized anatomical term used to describe a specific body cavity. It may refer to general spaces within the body but lacks the specificity and clinical relevance of the established cavity types. This distinction clarifies that internal cavity does not fit within the accepted classification of body cavities.