What does "exo-" indicate in medical terminology?

In medical terminology, the prefix "exo-" signifies something that is external or situated outside. It is derived from the Greek word "exō," which means outside or outward. This prefix is commonly used in various medical terms to describe structures or conditions that are located on the outer side of something, such as "exogenous," which refers to substances or factors that originate from outside an organism or system.

Understanding the meaning of prefixes like "exo-" helps in deciphering complex medical terminology, allowing health professionals to communicate specific ideas about bodily functions, diseases, or treatments effectively. In this context, knowing that "exo-" refers to "outside" can aid in distinguishing it from other prefixes that imply different spatial relationships, such as those indicating inner locations or positions relative to one another.