In this tutorial, we will draw the neuroanatomy of the cavernous sinus. Key structures/terms: sella turcica, pituitary body, optic nerves, sphenoid sinuses, venous trabeculations, cavernous sinus, lesser wing of the sphenoid bone, optic canal, superior orbital fissure, draw foramen rotundum, draw foramen ovale, cervical segment, carotid space, petrous segment, carotid canal, lacerum segement, foramen lacerum, trigeminal ganglion, cavernous sinus segment, clinoid segment, ophthalmic segment, ophthalmic artery, communicating segment, suprasellar cistern, anterior clinoid process, apex of the petrous bone/upper clivus, sella turcica, medial temporal lobe, Meckel's cave, optic nerve, oculomotor nerve, trochlear nerve, abducens nerve, trigeminal nerve: ophthalmic division, maxillary division, mandibular division.