Jamieson, Fausset and Brown on 1 Corinthians 12:14

14. Translate, "For the body also." The analogy of the body, not consisting exclusively of one, but of many members, illustrates the mutual dependence of the various members in the one body, the Church. The well-known fable of the belly and the other members, spoken by Menenius Agrippa, to the seceding commons [Livy, 2.32], was probably before Paul's mind, stored as it was with classical literature.