1. The document describes 5 clinical cases involving structures of the head and neck. 2. Case 1 involves a mass in the pterygopalatine fossa caused by the sphenopalatine ganglion, which receives sensory roots from the maxillary nerve and parasympathetic/sympathetic roots. 3. Case 2 describes cavernous sinus thrombosis resulting from spread of infection from a nasal septum abscess through venous plexuses and emissary veins.