Under what conditions does the Catholic Church explicitly call the laity extraordinary ministers?
Extraordinary ministers are seen in almost every parish. For the most part, they help the parish priest in the distribution of Holy Communion, as well as a few other functions surrounding the administration of the Eucharist.
In every celebration of the Eucharist, there should be a sufficient number of ministers of Holy Communion so that it may be distributed in a reverent and orderly manner. Bishops, priests and deacons distribute Holy Communion in virtue of their office as ordinary ministers of the Body and Blood of the Lord. When the size of the congregation or the incapacity of the bishop, priest, or deacon requires it, the celebrant may be assisted by other bishops, priests, or deacons. If such ordinary ministers of Holy Communion are not present, "the priest may call upon extraordinary ministers to assist him, i.e., duly instituted acolytes or even other faithful who have been deputed for this purpose. In case of necessity, the priest may also depute suitable faithful for this single occasion (GIRM 162)." - Extraordinary Ministers of Holy Communion at Mass
The Catholic Encyclopedia says the following about extraordinary ministers and the sacrament of baptism.
In case of necessity, baptism can be administered lawfully and validly by any person whatsoever who observes the essential conditions, whether this person be a Catholic layman or any other man or woman, heretic or schismatic, infidel or Jew.
The essential conditions are that the person pour water upon the one to be baptized, at the same time pronouncing the words: "I baptize thee in the name of the Father and of the Son and of the Holy Ghost." Moreover, he must thereby intend really to baptize the person, or technically, he must intend to perform what the Church performs when administering this sacrament.
The Roman Ritual adds that, even in conferring baptism in cases of necessity, there is an order of preference to be followed as to the minister. This order is: if a priest be present, he is to be preferred to a deacon, a deacon to a subdeacon, a cleric to a layman, and a man to a woman, unless modesty should require (as in cases of childbirth) that no other than the female be the minister, or again, unless the female should understand better the method of baptizing. The Ritual also says that the father or mother should not baptize their own child, except in danger of death when no one else is at hand who could administer the sacrament. Pastors are also directed by the Ritual to teach the faithful, and especially midwives, the proper method of baptizing. When such private baptism is administered, the other ceremonies of the rite are supplied later by a priest, if the recipient of the sacrament survives.
Thus my question: Does the Catholic Church explicitly call laity extraordinary ministers elsewhere in the administration of her sacraments or in her liturgy, other than the two mentioned above?