MMORPG.com Ultima Online guru V D writes this short guide to the Anatomy skill in the game, defining what it means for each score bracket in both Strength and Dexterity.
If you are a fighter, then there is absolutely no reason to not complete your Anatomy training. Anatomy is essential for all fighting characters. Being well skilled in anatomy provides your character with the knowledge of where to hit opponents for the most damage. Also you will have the ability to heal if you possess any healing skill, and a good anatomy skill will make you able to heal a higher number of points. For example, when you reach 61% you can cure poison, 80% (and 81% healing) you can resurrect another player using bandages. When you reach GM level, you will cause 20% extra damage with each successful hit to your enemy.
Read the Anatomy Trainging Guide