FIG 6. Right lateral view of the craniocervical junction in a venous corrosion cast. Note the presence of a prominent mastoid emissary vein (n) connecting to a deep cervical vein (m). The carotid artery venous plexus is clearly visible (l). b, transverse sinus; d, cavernous sinus; c, sigmoid sinus; a, superior jugular bulb; v, pterygoid plexus; g, posterior condylar vein; h, lateral condylar vein; u, internal jugular vein.