who is the head of this church?
Pope
Catholic Church
 The pope, who is the Bishop of Rome (and whose titles also include Vicar of Jesus Christ and Successor of St. Peter), is the chief pastor of the whole church,
what was the structure of the roman catholic church based on UNANSWERABLE
wiki:13008049
Catholic Church [SEP] Introduction
The Catholic Church, sometimes referred to as the Roman Catholic Church, is the largest Christian church, with approximately 1.3 billion baptised Catholics worldwide . As the world's oldest and largest continuously functioning international institution, it has played a prominent role in the history and development of Western civilization. The church consists of almost 3,500 dioceses (also called "local churches") around the world on every continent, each shepherded by its bishop. The pope, who is the Bishop of Rome (and whose titles also include Vicar of Jesus Christ and Successor of St. Peter), is the chief pastor of the whole church, entrusted with the universal Petrine ministry of unity and correction.