See Galen De anat. adm. 226.3-15: “The bones must be learnt . . . before dissecting the muscles, for these two form the groundwork of the other parts, the foundations, as it were, of a building. And next, study arteries, veins, and nerves. Familiarity with dissection of these will bring you to the inward parts and so to a knowledge of the viscera, the fat, and the glands, which also you should examine separately, in detail. Such should be the order of your training.” (tr. Singer 1956 p. 5).