Posterior ethmoidal foramen
Encyclopedia
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 sphenoid
Sphenoid bone
The sphenoid bone is an unpaired bone situated at the base of the skull in front of the temporal bone and basilar part of the occipital bone.The sphenoid bone is one of the seven bones that articulate to form the orbit...

, and transmits the posterior ethmoidal vessels and nerve
Posterior ethmoidal nerve
The posterior ethmoidal nerve is a branch of the nasociliary nerve.It passes through the posterior ethmoidal foramen, with the posterior ethmoidal artery.It carries sensory information from the sphenoid sinus and posterior ethmoidal air cells....

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