Panagia Kera is a compact form of a cross-in-square church with a dome. The north and south arms of the cross have semicircular ends, like apses. On the south side of the church there is a single-nave chapel, covered with a pointed barrel vault which is supported by a transverse arch.
At least four construction phases can be detected: The initial building dates from the 11th century. In the 14th century, a stone wall with a door, separating the sanctuary from the main church, was added. During a third construction period in the same century (14th), the church was extended towards the west. Finally, in the 15th-16th century, the single-nave chapel, consecrated to the worship of St. Anna, was added to the south side of the church.
Traces of fresco decoration are preserved in more than one layer. A few wall-paintings dating from the 11th century can be seen in the upper part of the apse of the sanctuary. Most of the wall-paintings though date from the 2nd half of the 14th century.
GEROLA, Giuseppe (μετ. ΛΑΣΣΙΘΙΩΤΑΚΗΣ Κ.), Τοπογραφικός κατάλογος των τοιχογραφημένων εκκλησιών της Κρήτης, Ηράκλειο, 1961
ΧΑΡΙΤΟΠΟΥΛΟΣ, Ευάγγελος, Η ενδοχώρα νότια του Ρεθύμνου κατά τον Ύστερο Μεσαίωνα : μελέτη και αξιολόγηση των αρχαιολογικών δεδομένων με εφαρμογή γεωγραφικών συστημάτων πληροφοριών (GIS), Πετρούπολη, 2009