The final text contained in MS 166 is De anatomia vivorum, a text that appears in medieval collections of Galenic texts, although it is not truly a work of that ancient Greek physcian and scholar. Due to some of the sources used within the treatise (Latin translations from Avicenna, Gerard of Cremona, and Razes), the text has been dated to roughly 1225. It also seems to have been composed in perhaps Paris or West Germany. It is a very early example of a medieval text that contains Aristotelian biological theory, by an anonymous author.

The treatise begins on f. 253v with the words, Medicorum anathomicos necesse est precognoscere quod humanum corpus cum sit compositum. It ends on f. 266r with: proximum est hepar et ita patet diversitas inter Galenum et Aristotelem. Explicit Anathomia.

Finally, a colophon on f. 266r reads: In vitium verti nimium fateor supra lite. Si studium non est nimium per tempora vite.

By the hand of the second scribe in MS 166.