Distension ofTheca of Extensor of the Digit 151 Fig.
In the carpal region, the flexors of the phalanges are contained together in the carpal sheath, and this is the principal theca in the carpal region.
The theca through which the deep digital flexor (perforans) plays in the tarsal region, begins about three inches above the inner tibial malleolus and extends about one-fourth of the way down the metatarsus.
In addition to aspirating synovia, the introduction of equal parts of alcohol and tincture of iodin into the theca is necessary.
Distension of theca of the extensor of the digit (extensor pedis).
A chronic inflammatory involvement of a theca through which an important tendon plays may cause adhesions to form.
Jungermannia and Marchantia have a calyptra, which the other genera are without; and in Jungermannia the theca has a sort of sheath, which is sometimes called the calyx.
When the calyptra falls, the theca is found to be covered with a little lid called the operculum; which also falls off in time, and shows the mouth or stoma of the theca.
The theca has no lid, but bursts into valves; and it generally contains not only sporules, but tubes formed of curiously twisted threads, called elaters.
In the cavity of the theca is a central axis called the columella, and around that are found the sporules, kept together by the lining of the theca, which forms a kind of open bag.
Numbers of ova die without reaching maturity, the follicular cells degenerate, and the follicle becomes filled with the cells of the theca interna, which have a resemblance to those of the true corpus luteum.
In the wall of the follicle two layers are distinguished, the theca externa, which is more fibrous, and the theca interna, which is more cellular.
Buds from the theca interna invade the follicle and form the connective tissue of the corpus luteum.
The theca is greatly distended over a variable extent of the cord; the cerebro-spinal fluid is increased in quantity and is under considerable tension; and the cord itself presents a shrunken appearance.
When the theca of the cord is directly infected the spinal symptoms predominate at first, but as the condition progresses it involves the cerebral membranes, and symptoms of acute general lepto-meningitis ensue.
Theca porous; septa compact and reduced in number.
As the process continues a number of calicles are formed, imbedded in a spongy tissue in which the canals ramify, and it is impossible to say where the theca of one corallite ends and that of another begins.
In others the peripheral ends of the septa are united only by bars or trabeculae, so that the theca is perforate, and in many such perforate corals the septa themselves are pierced by numerous perforations.
B), but the presence of the canal system in the perforate theca leads to a modification of the process.
Epitheca, an offset of the basal plate which surrounds the base of the theca in a ring-like manner, and in some corals may take the place of a true theca.
Corals have been divided into Aporosa and Perforata, according as the theca and septa are compact and solid, or are perforated by pores containing canals lined by endoderm.
The various forms therefore may not depend proximately on fructification itself, but on the peculiar growth given to the species, in the same way in fact as we have the numerous modifications of the theca in mosses, etc.
On the coalescence of the septa with the theca the space between the two limbs of the Y becomes filled up with calcareous tissue.
The theca does not arise till after the septa have become formed, and is at first a somewhat membranous cup quite distinct from the septa.
After the formation of the theca the septa become divided into two cycles by the predominant growth of six of them.
Thus while the mouth of the sicula is directed downwards, that of the first serial theca is pointed upwards, making a theoretical angle of about 180 deg.
From this bud is developed the first zooid and first serial thecaof the colony.
This theca grows in the direction of the apex of the sicula, to which it adheres by its dorsal wall.
From this first theca originates a second, opening in the same direction, and from the second a third, and soon, in a continuous linear series until the polypary is complete.
When the theca vertebralis was opened purulent matter flowed out, and a purulent effusion was found in patches on the brain.
Theca compressed in the oro-anal plane and a bilateral symmetry thus induced, affecting the food-grooves and, usually, the thecal plates and stem.
In this development of brachial extensions of the theca the genital organs were involved, and their ripe products formed at the ends of the brachia or in the branches therefrom.
The theca became sessile, and in its later developments much flattened (fig.
The crinoid type was differentiated by the extension of the food-grooves and associated organs along radial outgrowths from the theca itself.
These constituted the arms (brachia), and five definite radial plates of the theca were specialized for their support.
The pear-shaped body is encased in a theca formed by a number of polygonal plates, and is attached by its narrow end.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "theca" in a variety of sentences. We hope that you will now be able to make sentences using this word.
