There are a number of individual roles that must be accounted for when looking at the group of individuals that makes up the project management team. Breaking it down more carefully, you will see that the term project management team is comprised of the individual and unique members of the project team who find themselves to be directly involved in any or all project management related activities. There are a number of lower level team members who may be assigned specific tasks, and some higher level members who bear a larger portion of responsibility. Typically the project management team is broken down into some sort of a hierarchal format and that structure is typically headed up by a project management team leader, a term which is often used interchangeably with project manager. The project manager is typically the person who is directly responsible for the activities of the project team, and typically will take the reigns to steer the ship in the right direction.
This term is defined in the 3rd and the 4th edition of the PMBOK.