Posterior Ethmoidal Nerve - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The posterior ethmoidal nerve is a sensory nerve of the nasal region. It supplies sensory innervation to the dura mater and sphenoid and posterior ethmoidal paranasal sinuses. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Course The posterior ethmoidal nerve arises within the bony orbit as a branch of the nasociliary nerve (itself a branch of the ophthalmic division of the trigeminal nerve). It travels medially, leaving the orbit and entering the cranial cavity via the posterior ethmoidal foramen. It is accompanied by the posterior ethmoidal artery and vein. Within the anterior cranial fossa, it terminates as sensory nerves to the sphenoid and posterior ethmoidal sinuses. Sensory Supply The posterior ethmoidal nerve provides sensory innervation to the following structures: Sphenoid sinus Posterior ethmoidal sinus Dura mater associated with the anterior cranial fossa. Frequent questions What is the posterior ethmoidal nerve? The posterior ethmoidal nerve is a sensory nerve that supplies the dura mater and the sphenoid and posterior ethmoidal paranasal sinuses. It plays a crucial role in sensory innervation within the nasal region. What structures does the posterior ethmoidal nerve innervate? This nerve provides sensory innervation to the sphenoid sinus, posterior ethmoidal sinus, and the dura mater associated with the anterior cranial fossa. Its function is vital for sensory perception in these areas. How does the posterior ethmoidal nerve enter the cranial cavity? The posterior ethmoidal nerve enters the cranial cavity by passing through the posterior ethmoidal foramen after originating from the nasociliary nerve in the orbit. It travels medially and is accompanied by the posterior ethmoidal artery and vein. What is the origin of the posterior ethmoidal nerve? The posterior ethmoidal nerve originates as a branch of the nasociliary nerve, which is itself a branch of the ophthalmic division of the trigeminal nerve. This anatomical relationship is essential for its sensory functions. What is the clinical significance of the posterior ethmoidal nerve? The posterior ethmoidal nerve is clinically significant as it provides sensory innervation to critical structures in the nasal region, which can be involved in conditions affecting sinus health and cranial sensation. Understanding its pathway and function is important for diagnosing related conditions. Rate This Article