The ethmoidal nerves, which arise from the

nasociliary nerve The nasociliary nerve is a branch of the ophthalmic nerve, itself a branch of the trigeminal nerve (CN V). It is intermediate in size between the other two branches of the ophthalmic nerve, the frontal nerve and lacrimal nerve. Structure The na ...

, supply the ethmoidal cells; the posterior branch leaves the

orbital cavity In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket, or it can also be used to imply the contents. In the adult human, the volume of the orbit is , of ...

through the

posterior ethmoidal foramen Lateral to either olfactory groove are the internal openings of the anterior and posterior ethmoidal foramina (or canals). The posterior ethmoidal foramen opens at the back part of this margin under cover of the projecting lamina of the sphenoi ...

and gives some filaments to the sphenoidal sinus. There are two ethmoidal nerves on each side of the face: * posterior ethmoidal nerve * anterior ethmoidal nerve

References

External links

ufl.edu
Trigeminal nerve {{neuroanatomy-stub