It is square with a trapezoid apse covered by a ribbed vault. The chapel is hexagonal with a sexpartite ribbed vault. The interior comprises a single aisle under a ribbed vault. Unlike a ribbed vault, the entire arch is a structural member. It is also called a "ribbed vault". The chapter house has a quadripartite ribbed vault high. It is a medieval-style chapel with a ribbed vault and two relatively simple altarpieces. It is octagonal, with its ribbed vault supported on a central column. Adam, Noah, Abraham and Jacob are represented on the ribbed vault. The main chapel of the apse is covered by a Gothic ribbed vault. It is placed in its own hexagonal structure, with a ribbed vault roof. The ribbed vault of this square room was distempered during the renovations of 1727. The ribbed vault is large in scale and the first of its kind in Spain. The former city gate has a pointed archway, and a ribbed vault for the ceiling.