What is the term for direction toward the origin of attachment to the trunk?

The term that describes direction toward the origin of attachment to the trunk is "proximal." In anatomical terminology, "proximal" refers to a location that is closer to the point of attachment of a limb or structure to the trunk of the body. For example, the shoulder is proximal to the elbow because it is nearer to where the arm attaches to the body.

Understanding this term is important in fields such as medicine and biology, as it helps to accurately describe the relative positions of different body parts, especially when discussing injuries, surgeries, or anatomical features. The opposite of proximal is "distal," which refers to a location that is further away from the point of attachment.