What is the study of internal structures as they relate to overlying skin known as?

The study of internal structures as they relate to overlying skin is referred to as surface anatomy. This branch of anatomy focuses on the features and landmarks of the body that can be observed or palpated on the surface. It is essential for understanding how internal structures are positioned relative to the skin, which is especially useful in medical fields like physical examination and surgery. Surface anatomy helps in identifying the contours and positions of underlying structures, aiding healthcare professionals in diagnosis and treatment.

The other options pertain to different fields of study; for instance, histology examines tissues at the microscopic level, regional anatomy focuses on specific areas of the body and their interconnected systems, and pathology investigates diseases and their effects on body structures.