Riverside County and San Bernardino County to the north form this metro area. Like many such metro areas in the Southwest, it extends far into uninhabited desert areas, in this case east through the Mojave Desert to the Nevada/Arizona border. Larger than nine U.S. states, it is often referred to as the Inland Empire.
I agree with tchrist that the word doctor in doctor appointment is a noun (attributive noun I believe), although the definition of an attributive noun is a noun used as an adjective, so maybe it's just semantics at some point.
The Appointments Clause is part of Article II, Section 2, Clause 2 of the United States Constitution, which empowers the President of the United States to nominate, and with the advice and consent of the United States Senate, appoint public officials. Although the Senate must confirm certain principal officers, Congress may by law delegate the Senate's advice and consent role when it comes to inferior officers.