ossification in the ethmoid region
The rich vascular supply of the nose originates from the ethmoid branches of the internal carotid arteries and the facial and internal maxillary divisions of the external carotid arteries.
The frontal, maxillary and most of the ethmoid sinuses drain into this small channel.
On each side of the groove the dura is rough, because of its attachment to the cribriform plate of the ethmoid bone and because it is pierced by numerous olfactory nerve bundles.
Branches of the nasal nerve have been described passing to the frontal, ethmoidal , and sphenoidal sinuses.
At least 1 percent of persons in the population have symptomatic nasal polyps and up to 42 percent may have asymptomatic polyps on careful examination of the middle meatus, middle turbinate and ethmoids .
Due to the paucity of cases reported in the literature, treatment of ethmoidal adenocarcinoma with orbital compression is best discussed by referring to other paranasal tumours that invade the orbit.
Fleshy bundles may pass from the front and upper part of the planum of the ethmoid bone across the orbit to the levator.
Maxillary and ethmoidal sinuses were normal.
The two frontal sinuses are just above the eyebrows, the two maxillary sinuses by the cheekbones and the two ethmoidal sinuses are between the nasal cavity and the eye sockets, and drain into the middle of the nose.