Anatomical Reference -

Focuses on structure, evolution, and development .

Towards the head (upper) vs. towards the feet (lower) . anatomical reference

Towards the midline vs. away from the midline toward the sides. Focuses on structure, evolution, and development

Do you need focus on a (e.g., the foot, the brain, or the heart)? Focuses on structure

For deep academic study, researchers use specialized journals and databases:

Is this for a paper or a basic biology overview? Anatomical Concepts - an overview | ScienceDirect Topics