Anterior Ethmoidal Nerve - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The anterior ethmoidal nerve is a sensory nerve of the nasal region. It supplies sensory innervation to the dura matter, nasal cavity, and part of the external nose. 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 anterior ethmoidal nerve arises within the bony orbit as a terminal branch of the nasociliary nerve (itself a branch of the ophthalmic division of the trigeminal nerve). It leaves the orbit and enters the cranial cavity via the anterior ethmoidal foramen. It is accompanied by the anterior ethmoidal artery and vein. The anterior ethmoidal nerve then passes beneath the dura matter (to which it supplies anterior meningeal branches). It descends through a small foramen lateral to the crista galli of the ethmoid bone to enter the roof of the nasal cavity. Now within the nasal cavity, it travels along the internal aspect of the nasal bone, giving rise to medial and lateral internal nasal branches. It terminates as the external nasal nerve, which pierces the nasal cartilage to supply to the skin of the external nose. By TeachMeSeries Ltd (2026) Fig 1The anterior ethmoidal nerve arises within the bony orbit as a terminal branch of the nasociliary nerve. Sensory Supply The anterior ethmoidal nerve supplies sensation to structures in the head via its branches: Anterior meningeal branches – supplies the dura mater associated with the anterior cranial fossa. Medial internal nasal branch – supplies the anterior and superior aspect of the nasal septum. Lateral internal nasal branch – supplies the anterior aspect of the lateral nasal wall. External nasal nerve – supplies the skin of the nasal dorsum and nasal tip. Frequent questions What is the function of the anterior ethmoidal nerve? The anterior ethmoidal nerve is a sensory nerve that provides sensation to the dura mater, nasal cavity, and part of the external nose. It plays a crucial role in the sensory innervation of these structures. Where does the anterior ethmoidal nerve originate? The anterior ethmoidal nerve originates from the nasociliary nerve, which is a branch of the ophthalmic division of the trigeminal nerve. It arises within the bony orbit before entering the cranial cavity. What structures does the anterior ethmoidal nerve supply? The anterior ethmoidal nerve supplies sensory innervation to the dura mater, the nasal cavity, and the skin of the external nose. Its branches include the anterior meningeal branches, medial and lateral internal nasal branches, and the external nasal nerve. How does the anterior ethmoidal nerve enter the nasal cavity? The anterior ethmoidal nerve enters the nasal cavity by passing through a small foramen lateral to the crista galli of the ethmoid bone. It then travels along the internal aspect of the nasal bone. What is the significance of the external nasal nerve? The external nasal nerve is the terminal branch of the anterior ethmoidal nerve and supplies sensation to the skin of the nasal dorsum and tip. This branch is essential for the sensory perception of the external nose. Rate This Article