Question:hard
Onodi cells and Haller cells are associated with the following structures, respectively:
Onodi cells and Haller cells are associated with the following structures, respectively:
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Onodi sits posteriorly near the optic nerve; Haller sits low in the orbital floor.
Updated On: Jun 24, 2026
- Optic nerve and orbital floor
- Optic nerve and internal carotid artery
- Optic nerve and ethmoidal air cells
- Orbital floor and internal carotid artery
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The Correct Option is A
Solution and Explanation
Both Onodi and Haller cells are anatomical variants of the ethmoid air cells, and the question asks which neighbouring structure each one threatens.
Start with the Onodi cell. It is the most posterior ethmoid cell that balloons backward and upward into the sphenoid area, wrapping near the optic nerve. Because of this, surgeons must be cautious of optic nerve injury when operating in this region, so the Onodi cell is linked to the optic nerve.
Now the Haller cell, also called the infraorbital ethmoid cell. It grows downward into the floor of the orbit near the maxillary sinus opening, so it is tied to the orbital floor and can obstruct maxillary sinus drainage.
Pairing them in the order asked gives optic nerve for the Onodi cell and orbital floor for the Haller cell.
\[\boxed{\text{Optic nerve and orbital floor}}\]
Start with the Onodi cell. It is the most posterior ethmoid cell that balloons backward and upward into the sphenoid area, wrapping near the optic nerve. Because of this, surgeons must be cautious of optic nerve injury when operating in this region, so the Onodi cell is linked to the optic nerve.
Now the Haller cell, also called the infraorbital ethmoid cell. It grows downward into the floor of the orbit near the maxillary sinus opening, so it is tied to the orbital floor and can obstruct maxillary sinus drainage.
Pairing them in the order asked gives optic nerve for the Onodi cell and orbital floor for the Haller cell.
\[\boxed{\text{Optic nerve and orbital floor}}\]
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