Roman Catechism 20.22

Chapter 20 — Part II: The Sacraments — Extreme Unction

Section 22. Administration of Extreme Unction — The Sacred Unction is to be applied not to the entire body, but to the organs of sense only, -- to the eyes, on account of sight; to the ears, on account of hearing; to the nostrils, on account of smell; to the mouth, on account of taste and speech; to the hands, on account of touch. The sense of touch, it is true, is diffused throughout the entire body, yet it is more developed in the hands.