The interior is articulated with fluted Doric pilasters, without pedestals, and as a result there are inconsistencies at the juncture of the raised presbytery, which is flanked by the imperial and royal sepulchres. This leads on the east to the oblong Sagrario, open towards the principal retable and giving access to the monstrances. The church is connected to the austerely decorated private royal apartments on the south side, and an opening to the presbytery allowed the king to contemplate the high altar from his bedroom. The focal point of the palace is the two-storey Patio de los Mascarones, with arches supported by columns on one level and galleries on three sides. It is reached through a long room on the east side and gives access to the queen’s chamber on the north side.