pen·e·tra·li·a 
(pĕn′ĭ-trālē-ə)
(pĕn′ĭ-trālē-ə)pl.n.
1. The innermost parts of a building, especially the sanctuary of a temple.
2. The most private or secret parts; recesses: the penetralia of the soul.
[Latin penetrālia, from neuter pl. of penetrālis, inner, from penetrāre, to penetrate; see PENETRATE.]