Also, only the part nearest the carapace is muscular, the rest forming a long tendinous prolongation of the plastron wall (the primordial cranium), as seen in the figure.
The anterior dorso-plastron muscle (63) is attached dorsally to the carapace in the middle line, being joined to its fellow of the opposite side.
The nature of the change by which the muscle known in the scorpion as the anterior dorso-plastron muscle (63) was probably converted into the superior oblique muscle of the vertebrate, is represented in the drawings Fig.
The prosomatic skeleton of Limulus; the entosternite or plastron compared with the trabeculae of Ammocoetes; similarity of position, of structure, of origin in fibrous tissue.
In the prosomatic region the corresponding muscles are not so clearly defined in Limulus; they are apparently attached to the plastron forming the group of plastro-tergal muscles.
No part of the plastron stains purple with thionin; it hardly stains at all, or gives only a very slight blue colour.
The same structure is seen in the plastron of Hypoctonus, of Thelyphonus, and to a certainty in all the members of the scorpion group.
The next pair of muscles is the pair of anterior dorso-plastron muscles (63).
All the evidence points to the plastron as resembling the basi-cranial skeleton of Ammocoetes in its composition and in the origin {143}of its cells in a white fibrous tissue.
It appears,' she said, 'that Pierre Plastron was in the hospital all the time, and heard and saw many wonderful things.
I cried--'when I tell thee, Maman, that this Pierre Plastron knows nothing!
The slab bearing impressions of Brontozoum Gracillimum has a mark about fourteen inches long and two wide, which may be attributed to the plastron or breast-plate of the tortoise.
Both of these impressions are made apparently by theplastron of the turtle.
Plastral length was measured from the posterior edge of the plastron to the anteriormost edge of the ventral surface; other measurements were maximal.
The anterior and posterior lobes of the plastron had been folded over the bridge, forming a three-ply thickness of bone.
The Museum has an incomplete carapace and plastron (No.
Posterior lobe of | Posterior lobe of | Posterior lobe of plastron flares | plastrondoes not | plastron does not laterally.
The left half of the plastron is relatively complete, lacking only the epiplastron and entoplastron.
The humero-pectoral sulcus crosses the plastron behind the entoplastron in a straight line, and reaches the border anterior to the axillary notch.
Hewitt[5] gives two illustrations of carved wooden figures in Bamberg Cathedral, which show a plastron de fer worn over the jupon, which seems to be studded with metal.
Setting aside the plastron de fer, which, as has been noticed, is seldom shown in representations of armour, we find the first additional defence was the Poleyne or knee-cop.
An immensely long coral chain is wound countless times about the throat, and dangling from it are sacred medallions and variously sized crosses, the whole forming a plastron which descends to the waist.
It is important, therefore, to determine of how many bones the plastron is composed, since the full number of elementary parts of which an organ is composed is best seen when the organ is at the maximum of its development.
There are nine bones in the plastron of the tortoise.
The most highly developed sternum (according to this definition) is theplastron of the tortoise, whose structure it dominates (p.
Note the ligaments which attach the plastron to the shoulder and pelvic girdles.
In the two subspecies last named the longitudinal ridges on the plastronare indistinct or wanting and the bridge forms a lesser angle with the horizontal plane of the plastron.
Ground color of soft parts dark olive to slate gray or black; ground color of carapace olive to slate gray; ground color of plastron pale yellow, markings blackish, tinged with brown in younger specimens, sooty black in most adults.
The Queen's importunities decided the King to have a plastron made, to ward off a poniard thrust.
Composed of fifteen thicknesses of Italian taffeta, this plastron consisted of a vest and a large belt.
A, A, A, A; with half a dozen quick strokes of the knife detach the plastron from the flesh of the body, and lift it up until the interior of the body is exposed.
The skin is left attached to the front of the plastron for apparent reasons, but the plastron is turned up and over the head to completely expose the interior.
Defn: The second lateral plate in theplastron of turtles; -- called also hyosternum.
Defn: The third lateral plate in the plastron of turtles; -- called also hyposternum.
One of the first pair of lateral plates in the plastron of turtles.
They are really membrane bones, and are in no way homologous with true ribs, but correspond rather with the more posterior of the bones constituting the plastron of Chelonia.
The plastron is imperfectly ossified, and not united with the pelvis, and the whole surface of both carapace and plastron is covered with a tough leathery skin, without horny shields.
The unpaired ossification in the plastron of Chelonia is an interclavicle, and a representative of the same bone occurs arising from the sternum in Pterosauria.
In the Leathery Turtle (Dermochelys) the carapace and plastron differ completely from those of any other living form.
The carapace and plastron have a rough granular surface covered with skin and without any horny shields.
The three anterior elements of the plastron are respectively homologous with the interclavicle and two clavicles of other reptiles, while the remaining elements of the plastron are probably homologous with the abdominal ribs of Crocodiles.
The plastron is imperfectly ossified, and marginal bones may be absent, or if present are confined to the posterior portion of the carapace.
In Ichthyosauria, Sauropterygia, Crocodilia and Sphenodon, abdominal splint ribs occur; and probably all except the first of the paired ossifications forming the plastron of Chelonia are of similar character.
They are wanting too in the Chelonia, unless the first pair of ossifications in the plastron are to be regarded as clavicles.
The carapace and plastron vary in the extent to which they are ossified, and except in Dermochelys[72] and its allies are covered by horny plates.
It remains open in some turtles in which the plastron is longer than 100 millimeters.
The plastron of a juvenal box turtle is not completely immovable.
Hatchlings flex the plastron chiefly in the region of the humeropectoral seam, rather than at the anlage of the transverse hinge.
A movable plastron has occurred independently in two groups of emyids in the New World and in at least three groups in the Old World.
Reduction of the plastron is correlated with a general lightening of the shell, probably associated with the increased vagility of this species.
Extent of closure of the costoperipheral fontanelles in relation to length of plastron in 17 skeletons of T.
Adult box turtles, when walking, characteristically carry the forelobe of the plastron slightly flexed.
In general, the markings of the plastron are less sharply defined than the markings of the carapace (Pl.
Terrapene, nevertheless, is adapted for terrestrial existence and differs from all other North American emyids in having a hinged and movable plastron and a down-turned (although often notched) maxillary beak.
By the time adult or subadult size is reached, the plastron appears to have a pattern of pale radiations on a dark background.
Emargination of the plastron has occurred at the places where the limbs rub against it during locomotion.
Normal" rate of growth was determined by averaging records of increase in length of plastron for turtles in each age group.
I had ordered shirts, and ties too, and, not being in the habit of wearing undergarments, I had to consider what to do with the small tab beneath the plastron that should have anchored me forrard.
Upon the plastronand carapace these scales form large plates, the arrangements and appearances of which vary in different species, some of them being often remarkably beautiful.
Strauss-Durckheim (1) was the first to insist on the affinity between Limulus and the Arachnids, indicated by the presence of a free suspended entosternum orplastron or entosternite in both.
In this attitude the flat plastronforms the drumhead, so to speak, the carapace acting as a resonator.
It will be observed that it is the plastron or ventral surface that he is striking, as shown by the notches in its forward and hinder edges, though the plates are incorrectly drawn.
A strange figure it was, clad in garments that shone misty white in the shadow, whose fringes fluttered in the warm wind and whose glowing plastron glittered in the starlight.
She spread the straight sleeves apart, smoothing out the dangling fringe, and her hand lingered with a strange gentleness a-down the glowing plastron of bright beads.
The juvenal pattern consists of spots and ocelli; the plastron measures 3.
The plastron of soft-shelled turtles (Testudinata, Trionychidae): a new interpretation.
Plastron The plastron is united to the carapace by ligamentous tissue and is somewhat flexible anteriorly and posteriorly.
Septal ridges present; external and proportional characteristics variable (see accounts of subspecies); range in length of plastron (cm.
Juvenal pattern of black ocelli and spots, and two or more black, interrupted, lines paralleling rear margin of carapace; pale postocular and postlabial stripes often united on side of head; length of plastron short.
Anteriorly the plastron is somewhat hingelike and may contact the anteriormost edge of the carapace.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "plastron" in a variety of sentences. We hope that you will now be able to make sentences using this word.
