NIME Next Batch PGI Quest in Delhi from 10 August to 20 August
B. Optic nerve & Internal carotid artery
C. Optic nerve and naso lacrimal duct
D. Orbital floor and nasolacrimal duct
Onodi cells and Railer cells of ethmoid labyrinth seen in relation to following respectively?
A. Optic nerve & floor of orbitB. Optic nerve & Internal carotid artery
C. Optic nerve and naso lacrimal duct
D. Orbital floor and nasolacrimal duct
Ans. B. Optic nerve
&Internalcarotid artery
Explanation:
1. Ethmoid bone is a pumatic bone and has numerous air cells around the nose.
1. Ethmoid bone is a pumatic bone and has numerous air cells around the nose.
2. Onodi cells are formed by
pneumatization of the most posterosuperior ethmoid air cells over the sphenoid
sinus.
3. Onodi
cell is the most posterior ethmoidal
cell that is present superior & lateral to the sphenoid and is intimately
related to the optic nerveand
internal carotid artery.
4. The presence of Onodi cells
increases the chance that the optic nerve and/or carotid artery would be
exposed in
the pneumatized cell, over the
sphenoid sinus.
5. Optic nerve may be
seriously damaged in ESS (Endoscopic sinus surgery).
6. Hailer cell is a pneumatized
ethmoid cell that projects along the medial roof of the maxillary sinus.
7. Hailer cell represent
an extension of anterior ethmoidal air cells extending into the
infra-orbital margin (roof of
maxillary sinus).
8. Enlarged Hailer cells may
contribute to narrowing of the ethmoidal infundibulum and recurrent sinusitis
