The ministerial orders of the Roman Catholic Church are those of bishop, presbyter (more commonly called priest in English), and deacon. The ordained priesthood and the common priesthood (or priesthood of all the baptized faithful) are different in function and essence. The Catholic Church teaches that when a man participates in priesthood, he participates in the priesthood of Christ Himself. All men who, through the Sacrament of Holy Orders, have become priests participate in Christ's priesthood; they act in persona Christi Capitis, in the person of Christ, the Head of His Body, the Church.