Pterygoid Venous Plexus — MFDS Part 1 MCQ

Correct answer: E — Foramen ovale emissary veins

The correct answer is E. Emissary venous channels traversing the foramen ovale provide a direct communication between the pterygoid venous plexus and the cavernous sinus. A related channel may instead traverse the sphenoidal emissary foramen (foramen of Vesalius), but this does not make another listed option correct. This communication provides a potential route for infection to spread from the infratemporal region into the cranial cavity. The deep facial vein connects the pterygoid plexus with the facial venous system, while the maxillary vein carries extracranial drainage from the plexus toward the retromandibular vein. The retromandibular and external jugular veins therefore participate in extracranial drainage rather than forming the direct cavernous sinus connection.

Reference: Leonel LCP et al. Topographic and microscopic anatomical description of the emissary sinus of foramen ovale in adult humans. Clinical Neurology and Neurosurgery. 2018;169:77–85. https://pubmed.ncbi.nlm.nih.gov/29635105/