Variable transparency in a Middle Fossa approach to the skull base. The VM permits user exploration of approaches. Variable transparency allows for learning anatomy in disparate positions. Note the fidelity of the anatomy [Greater Superficial Petrosal Nerve and Geniculate Ganglion (olive), Superior Petrosal Sinus (turquoise) and Carotid Artery (red)]. The transparent function allows further appreciation of the anatomical relationships of structures [Sigmoid Sinus (blue), Emissary Vessels (red), and Superior Semicircular Canal (Green)].