What does the prefix 'endo' refer to?

The prefix 'endo' is derived from the Greek word meaning "within" or "inside." In medical and biological terminology, 'endo' is frequently used to describe structures or conditions that are located inside a particular organ or system. For example, the term 'endocardium' refers to the inner lining of the heart, indicating that it is situated within the heart itself. Understanding prefixes like 'endo' is essential in physical therapy, as it helps technicians accurately comprehend and communicate about anatomy and various conditions that may affect the body.