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Figure 3: The cranial openings of the ethmoidal canal. The brown line in lateral margin of the olfactory fossa represents the dura mater branch of the anterior ethmoidal artery. The orange line indicates the dura mater branch of the middle ethmoidal artery. The blue line represents the dura mater branch of the posterior ethmoidal artery. The cranial opening of the optic canal was located at the medial side of the anterior clinoid process. The red line represents the ophthalmic artery. Crista galli (CG), ophthalmic artery (OA), anterior clinoid process (ACP)

Figure 3: The cranial openings of the ethmoidal canal. The brown line in lateral margin of the olfactory fossa represents the dura mater branch of the anterior ethmoidal artery. The orange line indicates the dura mater branch of the middle ethmoidal artery. The blue line represents the dura mater branch of the posterior ethmoidal artery. The cranial opening of the optic canal was located at the medial side of the anterior clinoid process. The red line represents the ophthalmic artery. Crista galli (CG), ophthalmic artery (OA), anterior clinoid process (ACP)