"It then enters the superior nasal cavity by descending through the cribriform plate by passing through the nasal slit immediately lateral to the crista galli to supply the mucosa of the anterosuperior half of the nasal septum and lateral nasal wall. It grooves the internal surface of the nasal bone and terminates by piercing the nasal cartilage to become the external nasal nerve, supplying the skin of the dorsal nose and the nasal apex."