Question

Onodi cells and Haller cells are associated with the following structures, respectively:

• A. Optic nerve and orbital floor
• B. Optic nerve and internal carotid artery
• C. Optic nerve and ethmoidal air cells
• D. Orbital floor and internal carotid artery

Hint:

Onodi sits posteriorly near the optic nerve; Haller sits low in the orbital floor.

Answer 1

The Correct Option is A

Step 1: Define Onodi (Odoni) cells.
Onodi cells are the most posterior ethmoid air cells that pneumatise laterally and superiorly to lie in close relation to the optic nerve (and often the internal carotid artery) within the sphenoid region. Their clinical importance is the intimate relationship with the optic nerve, which is at risk during endoscopic sinus surgery.

Step 2: Define Haller cells.
Haller cells (infraorbital ethmoid cells) are ethmoid air cells that extend along the floor of the orbit, around the region of the infraorbital canal and the maxillary sinus ostium. They are associated with the orbital floor and can narrow the maxillary sinus drainage pathway.

Step 3: Match to the options.
Onodi cell relates to the optic nerve; Haller cell relates to the orbital floor. The correct pairing is therefore optic nerve and orbital floor.

Step 4: Conclusion.
The answer is optic nerve and orbital floor (option A). This matches the printed key.