The Egyptians not only employed the semicircular arch; they made use, in a few instances, of the pointed form, and many of their underground buildings have roofs cut out of the rock in the form of a segmental vault.
After the masonry had hardened, piers were built on the arches to support the segmental timbers.
The rock near the shaft contained many wet rusty seams, and settlement was detected in the segmental tunnel timbering soon after the widening of the heading was completed.
Soon after their formation the blind ends of the segmental tubes come in contact with, and open into the segmental duct, and each of them becomes divided into four parts.
In Birds the development of the segmental tubes is more complicated[259].
The next important change concerns the segmental duct, which becomes longitudinally split into two complete ducts in the female, and one complete duct and parts of a second duct in the male.
In the adult however many of the segmentalorgans become compound, and may have as many as twenty funnels, etc.
In Coeciliidae the earliest stages are not known, but the tubes present in the adult (Spengel) a truly segmental arrangement, and in the young each of them is single, and provided with only a single peritoneal funnel.
In the Coeciliidae the junction takes place in an homologous part of the Wolffian body, but, owing to the development of the anterior segmental tubes, which are rudimentary in the Urodela, it is situated some way behind the front end.
From the analogy of the splitting of the segmental duct of the Vertebrata into the Muellerian and Wolffian ducts, as a result of a combined generative and excretory function (vide p.
The mesonephros of the Ammocoete undergoes at the metamorphosis complete atrophy, and is physiologically replaced by a posterior series of segmental tubes, opening into the hindermost portion of the segmental duct (Schneider).
In the case of Reptilia the anterior two or three segmental tubes in the region of the testis probably have this function.
The embryonic excretory organs of vertebrates, consisting primarily of the segmental tubes and segmental ducts.
A segmental tubule; one of the tubules of the primitive urinogenital organs; a segmental organ.
Any surface of semicircular or segmental form; especially, the piece of wall between the curves of a vault and its springing line.
The gill-slits were considered by Dohrn to be derived from the segmental organs of Annelids, which were present originally in every segment of the primitive ancestor.
Each gill had its veins and arteries, each had its branch of the ventral nerve-cord, and between each successive pair of gills a segmental organ opened to the exterior" (p.
Cunningham,[412] of an internal segmental duct in Lanice, into which several nephridia opened, seemed to strengthen this view.
Except at the gate floors, there is a segmental invert of dressed stone of such curvature that it is 6 feet 6 inches lower in the middle than at the side walls.
The masonry of this entrance has curved battering sides, with a segmental invert.
The figures also illustrate the circular and segmental forms of yoke construction.
In form, these yokes may be either circular or segmental as shown in figs.
The segmental organs of Peripatus, Annelids, and Vertebrates do not appear to be possible equivalents of the excretory organs of Arthropods.
The segmental tubes forming the Wolffian body of Vertebrates have at first no outlet, and embryologists have hesitated to regard this phase of development as the permanent condition of any ancestral form.
Some little way in front of the point where the two segmental ducts coalesce to form the urinary bladder, the genital ridge comes into view.
From these two extracts it is clear that Semper regards both the vasa efferentia, and central canal of the testis network, as well as the longitudinal canal of the Wolffian body, as products of the anterior segmental tubes.
The figure shews two segmental tubes opening into the body-cavity and connected with a primary Malpighian body, and also, by a fibrous connection, with a secondary Malpighian body of the preceding segment.
In the region between the insertion of the genital ridge (or ovary, as we may more conveniently call it) and the segmental duct we detected the openings of a series of peritoneal funnels of the excretory tubes (Plate 39, fig.
The outer layer of their capsule is for the most part formed of flattened cells; but, between the opening of the segmental tube and the efferent tubulus of the kidney, their cells become columnar.
After the formation of their junctions with the segmental duct, other changes soon take place in the segmental tubes.
In the lateral regions of the trunk the two segmental or archinephric ducts (sg.
Semper's view also differs from ours, in that he believes the Wolffian duct to correspond in its entirety with the segmental duct.
The section is taken through the point where the segmental duct and Wolffian duct have just become separate; gr.
It also shews one segmental tube (rst) imperfectly connected with the accessory Malpighian body of the preceding segment of the kidney.
Above the calotte are the three windows of the first floor room, 88, covered by segmental arches.
The second, third, and fifth recesses contain low doors covered by a segmental arch.
Though the columns are of stone masonry, the capitals, together with the arches and walls they carry, and the segmental vaults, are of brick.
A circular valve disk with concentric segmental ports revolves at the same rate as the crank over ports in the valve face common to the three cylinders.
To this are attached two sets of arms A of wood or iron, which support circularsegmental plates, B, termed shrouds.
The cavity A is filled with steam, and to support the disks P against the pressure segmental blocks B of cast iron are placed behind them, the number of these blocks being as indicated by the dotted radial lines in the figure.
A segmental circular saw is one in which the saw is composed of segments secured by screws to a disc, the construction being such as shown in Fig.
Two segmental slots in the base admit of a rotary movement of the vice within a range of 90 deg.
Two small Segmental Curves, filled with dots, and 2 Signs like ladders.
It is about seven and twenty feet long, by thirteen across, having a narrow square headed opening at the East end, and a rude segmental doorway, and a narrow window divided into two parts on the South side.
Like every thing else, this window has submitted to the chisel of modern art, wherefore the ornamental portions have been worked off in order to form a segmental head.
In this type of construction, the primary part of the tunnel structure consists of an iron shell, formed of segmental rings, bolted together through inside flanges, and forming a large articulated pipe or tube, circular in section.
The inner side of the door has a segmental head and on either jamb are tall twisted shafts.
Inside the vault is Gothic and segmental, but the west window is even more strange than the southern; its inner arch is segmental and there are window seats in the thickness of the wall.
At about the level of the pendant the open space is crossed by a cusped segmental arch supporting elaborate flowing tracery.
All the openings have segmental pointed heads with rather poor mouldings.
Each is subdivided into two lights with segmental round heads, supporting a vesica-like opening.
This is the segmental duct, which persists, apparently, as the Wolffian duct (W.
These tubuli are the segmental tubes or nephridia.
We are now in a position to notice, without any danger of misconception, what is called the segmentaltheory of the skull.
Connected with the foremost one is seen a body which looks like the remnant of a segmental tube and its opening (rst?
The section passes through a leg, and shews the opening of the segmental organ (o.
The segmental tube and opening are not in the plane of the section, but the dilated vesicle is shewn into which the segmental tube opens.
Growth from vesicle at the end of a segmental tube to join the collecting tube of the preceding segment.
Close to the hindermost vas efferens is seen a body which resembles a rudimentary segmental tube (rst?
The section represented shews that in some instances the formation of the oviduct and Wolffian duct is accompanied by a division of the lumen of the segmental duct into two not very unequal parts.
The sections shew that the oviduct arises as a thickening on the under surface of the segmental duct into which at the utmost a very narrow prolongation of the lumen of the segmental duct is carried.
It also shews the segmental duct and the junction of the latter with its fellow of the right side to form the so-called bladder, this part being represented as cut open.
The first three pairs of segmental organs consist only of the vesicle and duct leading to the exterior.
It illustrates the structure of the primitive ova, segmental tubes, notochord, etc.
With reference to these it deserves to be noted that the segmental tubes behind the anus are quite disconnected, as is proved by the fact that a tube is absent on one side in 9c but reappears in 9d.
The terminal portion has the same histological characters as in the case of the hinder segmental organs.
This rudiment of the permanent kidneys consists of coiled urinary canals with Malpighian capsules and vascular coils (without ciliated funnels), of the same structure as the segmental mesonephridia of the primitive kidneys.
From these segmental muscle-plates, which are chiefly concerned in the segmentation of the Vertebrates, proceed the lateral muscles of the stem, as we find in the simplest form in the Amphioxus (Figure 2.
The segmental canals (a pair in each segment of the middle part of the body) open internally by a ciliated funnel into the body-cavity.
In the Selachii also we find a longitudinal row of segmental canals on each side, which open outwards into the primitive renal ducts (nephrotomes, Chapter 1.
At the headstock end, this rock-shaft carries another segmental pinion meshing with rack teeth formed on the cross-slide.
The rear end of this yoke has rack teeth meshing with the teeth of a segmental pinion, which is fastened to rock-shaft B.
Almost always they are semicircular, but instances of the employment of a segmental arch, or of one the outline of which is a little more than half a circle, may be occasionally met with.
The columns are surmounted by a small square slab, technically called an abacus, and heavy square beams or architraves span the spaces between the columns, while the roof between the architraves has a slightly segmental form.
These muscles, like the other voluntary muscles of the body, are derived from the primitive myotomes and are therefore segmental in origin.
The mesenchyme in which they arise is segmental in origin (sclerotom), which suggests that they too may have been primitively segmental, but in existing fishes there are commonly two sets of arcualia to each body segment.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "segmental" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: analytic; analytical; incomplete; part; partial; sectional
