* By distance: If we're talking about physical distance from the skin, then the answer would depend on the specific body part. For example, in a human, the bones are generally furthest from the surface. However, if you're looking at the entire body, the brain might be considered the furthest structure from the skin, sitting deep within the skull.
* By function: If you're asking about structures that are functionally furthest from the surface, then the answer could be something like the nervous system or hormonal system. These systems have a vast network of cells that extend throughout the body, influencing many processes from the inside.
To give you a better answer, please clarify your question:
* What kind of body are you talking about? (Human, animal, etc.)
* What are you referring to by "structure"? (Organ, system, cell type, etc.)
* What is the context of your question? (Anatomy, physiology, biology, etc.)
Once you provide more information, I can help you find the answer!
