The part of the skull lying immediately in front of the cranial cavity and in relation to the nasal capsules constitutes the =ethmoidal region=.
The plane of the tentorium is called the =tentorial plane=, and the angles that it makes with the basicranial axis and with the occipital and ethmoidal planes vary much in different mammals.
The ethmoidal region is the only one in which much of the primordial cartilaginous cranium remains.
The plane of the cribriform plate is called the =ethmoidal plane=, and as was the case also with the occipital plane, the angle that it makes with the basicranial axis varies much in different mammals, and is of importance.
Both cartilage and membrane bones take part in the formation of the skull, and a considerable amount of cartilage remains unossified, especially in the ethmoidal and sphenoidal regions.
This development also has the effect of making the ethmoidal and occipital planes lie, not at right angles to the basicranial axis, but almost in the same straight line with it.
In advanced stages of the disease, attended with much defluxion from the nose, the cells of the ethmoidal bone and the frontal sinuses are filled with pus.
Occasionally bleeding occurs from one of the anterior ethmoidal veins, and under these circumstances the blood flows downwards between the middle turbinal and the septum.
The treatment consists in extending the operation for the frontal or maxillary sinus so as to ensure drainage of the ethmoidal cells.
The presence of polypi and granulations, with pus oozing out from between them, and increasing after withdrawal of the probe, and the detection of carious bone are significant of ethmoidal suppuration.
If, on the other hand, the pus is detected in the olfactory sulcus, attention must be directed to the posterior ethmoidal cells and sphenoidal sinus (Fig.
If on examination by anterior rhinoscopy, pus is seen in the middle meatus, suspicion should be aroused of its origin in the maxillary sinus, frontal sinus, or anterior ethmoidal cells, as all these cavities communicate with that channel.
The operation for draining the sphenoidal sinus is extended by removing the inner wall of the posterior ethmoidal cells.
Between it and the inferior turbinated body is the middle meatus, with which communicate the openings of the maxillary sinus, the frontal sinus, and the anterior ethmoidal cells.
Besides, this operation does not deal with the orbital recess of the sinus, or the orbito-ethmoidal cells--the most important part of the operation.
The beak of a punch-forceps is seen in a posterior ethmoidal cell (which has been opened) and pressing against the anterior wall of the sphenoidal cavity.
If this cannot be done without anxiety as regards the attachment of the pulley of the superior oblique, it is better to risk this than to leave pus-secreting pockets of orbito-ethmoidal cells cut off from drainage in the roof of the orbit.
If the growth extends upwards and inwards to the ethmoidal region this infralabial opening can be combined with Moure’s operation.
With a large sharp spoon, acting from above downwards and forwards, the ethmoidal labyrinth can be cleared away with any tumour which may have infiltrated it.
He now agrees that it is safer to leave the external angle with a small drainage tube running inwards and downwards to the area of the fronto-ethmoidal cells.
Thus in one instance it may extend far out into the wing of the sphenoid, while in another it may be even smaller than a posteriorethmoidal cell invading the body of the sphenoid bone and lying above it.
The canula might be thought to have entered the frontal sinus, whereas the X-rays show that its point has only penetrated an ethmoidal cell.
When the ethmoidallabyrinth is being cleared, or the sphenoidal sinus opened, a sponge may be placed in the post-nasal space as described above until the operation is completed.
A strip of ribbon gauze is loosely packed in the lower part of the enlarged fronto-ethmoidal space, and the end is led down to the nasal orifice.
This would be called for particularly in growths so large that they could not be attacked through the narrow vestibule of the nose, and for those in which the attachment is evidently in the ethmoidal region.
Below the bridge is the opening to the ethmoidal region.
If the ethmoidal labyrinth has not been completely dealt with, one or two cells may continue to secrete.
The latter is undoubtedly to be preferred in all cases of well established chronic purulent sinusitis with fungating mucosa and involvement of the ethmoidal cells.
Defn: Of or pertaining to both the sphenoidal and the ethmoidal regions of the skull, or the sphenethmoid bone; sphenethmoidal.
On the lower surface of the frontal lobes there exists a strongly marked ethmoidal prominence.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ethmoidal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
