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Anatomy & Physiology of Nose

Question
22 out of 33
 

Onodi cells and Haller cells are seen in relation to [AIIMS Nov 09]



A Optic nerve and-floor of orbit

B Optic nerve and internal carotid artery

C Optic nerve and nasolacrimal duct

D Orbital floor and nasolacrimal duct

Ans. A Optic nerve and floor of orbit.

The Onodi and Haller cells are ethmoidal air cells.

Ethmoidal sinuses

They very from 8 to 18 in number and lie within the lateral part of ethmoid bone (between nasal cavity and orbit) called as ethmoidal labyrinth.

Ethmoidal sinuses are divided into 2 groups: (Note earlier there were 3 groups):

- Anterior

- Middle

- Posterior

Now middle group is incorporated in anterior group.

Anterior ethmoidal air cells

Anterior Group.

Middle ethmoidal air cells

Posterior group

Open into the middle meatus

2 cells are important in this group:

Agar cells:

Related to lacrimal sac and duct

Haller cells:

Related to orbital floor

These ethmoid cells extend into the roof of maxillary sinus ostium. These cells remain asymptomatic or affect maxillary sinus ventilation and drainage resulting in recurrent

or chronic maxillary sinusitis. They are present in 10 % of population

Form a round elevation k/a ethmoidal bulla on the lateral wall of nasal cavity Middle ethmoidal sinus drains into middle meatus above the ethmoidal bulla

Posterior ethmoidal air cells drain

into superior meatus and some in

sphenoethmoidal recess

Most important cells of this group are:

Onodi cells:

They are the most posterior ethmoidal cells which lie in close association with optic nerve,

in the floor of orbit. Onodi cells must be recognised during the endoscopic sinus surgery on posterior ethmoid to avoid optic nerve injury.

Anatomy & Physiology of Nose Flashcard List

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