It’s undeniable that people in Heathendom like to learn earlier stages of Germanic languages. Typically in the Anglosphere this is Old Norse because of Ásatrú, but outliers do exist. Most, however, want to learn just religious terms, even if that is only a tiny percentage of the overall language. So let’s be contrary and learn about the body in Old English.
The art of medicine is lǣcecræft (masculine). A lǣce (masculine) is a doctor or a physician; a lǣce is also a leech, which was likely assimilated into the first set of meanings by popular etymology. Lācnian is to heal, treat, or cure, while hǣlan is to heal. Doing so probably requires lācnung (“medicine”, feminine), which is possibly a sealf (“salve”, feminine), but all of this might cost lǣcefeoh (“physician’s fee”, neuter). Just be careful of an unlǣce (“unskilled physician”, masculine).
Let’s go over the body now.