Fig. 43-22. A, Right lateral aspect showing the structures related to the cavernous sinus. The numerals 2 to 6 on the internal carotid artery indicate the successive parts of the artery; parts 2 to 4 constitute the anteriorly directed carotid siphon. (After Cunningham.) B, Coronal section through the cavernous sinus along the plane XY in A. Although the maxillary nerve is shown here in rather close relation to the sinus (as it is usually depicted), according to W. R. Henderson (J. Anat., 100:905, 1966) the nerve is embedded in the dura of the middle cranial fossa, lateral to the sinus. Click for high resolution image.