The orbital surface of frontal bone, or the orbital part of frontal bone, is one of the three parts of the frontal bone. The other two parts are the squamous part and the nasal part. It consists of two triangular plates, the orbital plates, separated by a quadrilateral indentation, the ethmoidal notch. This notch contains the cribiform plate of the ethmoid bone and the frontal air sinuses open in front of it. The orbital plates have smooth, concave surfaces and form the largest part of the roofs of the orbit. They both contain a shallow fossa for the lacrimal gland.
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