In the Orthoptera the position is quite different, for one tegmen more or less lies over the other.
Thus, if the procedure be carried out through the tegmen tympani, the brain is explored in an upward direction.
This procedure in the case of polypi arising from the region of the tegmen tympani has been known to give rise to fatal meningitis.
In removing the bone, it must be remembered that the tegmen tympani is exceedingly thin, and unless care is taken pieces of bone may be pressed inwards on to the overlying dura mater.
In doing so he may suddenly meet with a gush of purulent discharge coming through an opening in the bone in the region of the tegmen tympani or sigmoid sulcus.
In this instance the bone is being removed above the tegmen tympani in order to expose the lower portion of the middle fossa.
If there be disease of the tegmen tympani and the symptoms point to a temporo-sphenoidal abscess, the brain should be explored through this opening in the bone (Fig.
A, Above the tegmen tympani; B, Through the tegmen tympani.
Its roof, the tegmen tympani, a plate of bone frequently of extreme thinness, separates the cavity of the middle ear from the middle fossa of the cranium.
Its roof, the tegmen tympani, is continuous with that of the attic.
It forms the highest point of the labyrinth, becoming fused with the innermost portion of the tegmen tympani, and is in such close relationship with the upper surface of the petrous bone as to cause a smooth elevation on its surface.
In this case the Anal Area of one Tegmen covers that of the other.
Tegmen flexible, with distinct ambulacrals and numerous small interambulacrals; mouth and food-grooves remain supra-tegminal and open.
Monocyclica in which the dorsal cup is confined to the patina and occasional intercalated anals; such ambulacrals or interambulacrals as enter the tegmen remain supra-tegminal and not rigidly united.
Monocyclica with dorsal cup primitively confined to the patina and an occasional single anal; tegmen solid; portions of the proximal brachials and their ambulacrals tend to be rigidly incorporated in the theca.
The tegmen in most primitive forms, as well as in the embryonic stages of the living Antedon (fig.
Diagram of a simple form of Crinoid, with five arms, each forking once; the one nearest the observer is removed to expose the tegmen of five orals.
The tegmen tympani are relatively large, but proportionately short.
The delicate, spindle-shaped columellae lie ventral to thetegmen tympani and squamosals, are spatulate distally, and have a broad basal attachment to the auditory region.
The auditory regions are relatively massive and bear narrow tegmen tympani; the distal ends of the tegmen tympani are medial to the lateral edge of the pterygoids in dorsal view.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "tegmen" in a variety of sentences. We hope that you will now be able to make sentences using this word.
