There are 4 sets of sinuses ordinarily present in humans, but congenital absence or hypoplasia of one or more sinus cavities is not uncommon. The maxillary and ethmoidal sinuses form during the third ...
Expert Rev Ophthalmol. 2007;2(04):557-570. Anterior and posterior ethmoidal foramina transmit the ethmoidal branches of the ophthalmic artery. The anterior and posterior ethmoidal foramina are located ...
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