In Amniotic animals the base of the skull appears bent in on the abdominal side, so that the head sinks upon the breast.
It is no wonder that transforming conditions of adaptation powerfully influenced the Vertebrate tribes also in the beginning of the Trias period, and caused the origin of Amniotic animals.
Again, the amniotic fluid prevents injuries that might otherwise befall the child in case the mother wears her clothing too tight.
Ultimately, theamniotic fluid assists in dilating the mouth of the womb, which remains closed until the beginning of the process that terminates with birth.
Likewise, rupture of the sack containing the fetus, with escape of the amniotic fluid, indicates that the culmination of events will not long be delayed.
Some physicians believe that the fetus swallows the amniotic fluid and thus secures nourishment.
The raw maternal surface was formerly attached to the inside of the uterus; the fetal surface, covered by the amniotic membrane, was in contact with the amniotic fluid.
This fluid, called "The Waters" by those who have no special knowledge of anatomy, is technically designated as the Amniotic Fluid.
In the earlier months of pregnancy the amniotic fluid is not abundant; later it increases rapidly, so that by the end of the period it measures about a quart, and frequently even more.
Harmful as the practice of tight-lacing during pregnancy is, it does not, thanks to the presence of the amniotic fluid, result in the disfigurement of the child.
Their size and number vary with the degree of abdominal distention, which in turn depends upon various factors, such as the size of the child and the quantity of amniotic fluid.
The uterine contractions at the onset of labor compress the fluid; in turn the fluid attempts to escape but is held in check by the amniotic membrane, which it drives into the canal leading from the uterine cavity to the vagina.
The slightly yellow amniotic fluid is itself clear, but small particles of dead skin and other material cast off from the surface of the child's body are floating in it, and may cause turbidity.
The uppermost layer will form the external covering of the embryo, and also the amniotic folds; from it there differentiates out at a very early stage the rudiment of the central nervous system, forming a more or less independent layer.
The most interesting point to be noticed in connection with the yolk-sack circulation of Scyllium is the fact of its being formed on a completely different type to that of the Amniotic Vertebrates.
In order to establish my hypothesis on the nature of the primitive streak, it is necessary to find the representatives of both these parts in the primitive streak of the amniotic vertebrates.
The following paragraphs contain a detailed attempt to establish the above view by a careful comparison of the primitive streak and its adjuncts in the amniotic vertebrates with the blastopore in Elasmobranchii.
The permeability of the digestive tract at an early period, and the necessary entrance therein, according to the laws of hydrostatics, of the albuminous amniotic fluid.
The constant presence of nutritive substances in the amniotic fluid during the whole period of gestation.
Of or pertaining to the amnion; characterized by an amnion; as, the amniotic fluid; the amniotic sac.
A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; Ð formerly called allantoic acid and amniotic acid.
The gathering of "the waters," or the amniotic fluid.
The embryo floats in a watery fluid, which fills the space between the embryo and the amnion, and is called the amniotic fluid (Figures 1.
The embryo (a month old) hangs in the middle of the amniotic cavity by the ventral pedicle or umbilical cord, which connects it with the placenta (above).
The outer part of the lateral plates forms the ventral wall or the lower wall of the body, the two lateral plates bending considerably on the inner side of the amniotic fold, and growing towards each other from right and left.
Less frequently amniotic bands so constrict the digits or the limbs as to produce distortion, or even to sever the distal part--intra-uterine amputation.
Then, in the presence of the three visiting physicians, a sixth amniotic sac was delivered with its fetus.
There was complete absence of amnioticfluid during labor.
There is another observation of an accouchement terminating successfully twenty-three days after the loss of the amniotic fluid.
The secundines weighed ten pounds and there were nine quarts of amniotic fluid.
The placenta and membranes were normal, a fact indicating that the defect was not due to amniotic adhesions; the child had a club-foot on the left side.
Griffiths speaks of rupture of the amniotic sac at about the sixth month of pregnancy with no untoward interruption of the completion of gestation and with delivery of a living child.
We learn later that the fœtus floats in amniotic liquor.
Even the amniotic fluid and the nutritive liquid for the fœtus are present, and the wanderer remakes himself into a splendid king.
In narrower sense it is also seminal fluid and the amniotic liquor.
In A the amniotic folds have not quite met so as to cover the ventral plate.
G, which corresponds to D at a later stage, is introduced to shew the manner in which the allantois, now a considerable hollow body, whose cavity is continuous with that of the alimentary canal, becomes directed towards the amniotic fold.
In the tail of the Amniotic Vertebrata the primitive arrangement is also more or less retained, and the same holds good for the dorso-lateral trunk muscles of the Lacertilia.
The continuity of the pleuroperitoneal cavity, within the body, with the interior of the amniotic fold, outside the body, is evident; both cavities are dotted.
The serous membrane (or outer primitive amniotic fold) is, by the completion of the cleavage of the mesoblast and the withdrawal of the yolk-sack, entirely separated from the embryo.
The inner membrane thus built up forms a completely closed sack round the body of the embryo, and is called the amniotic sack, or amnion proper (fig.
This pulsation is probably due to the contraction of involuntary muscular fibres, which seem to be present in the attenuated portion of the mesoblast, forming part of the amniotic fold.
Amongst the amniotic Vertebrata the postanal gut is less developed than in the Ichthyopsida.
The second point is of some importance for understanding the relations of the formation of the layers in the amnioticand the non-amniotic Vertebrates.
Close to the body this space may be called the pleuroperitoneal cavity; but outside the body it runs up into either amniotic fold, and also extends some little way over the yolk.
The edge of this plate coincides with the line of the amniotic fold, and as this fold rises up the two sides of the plate become bent over the embryo and give rise to the inner limb of the amnion or amnion proper.
This organ is only found in a completely differentiated form in the amniotic Vertebrata.
In the Amniotic Vertebrates there is formed underneath the vertebral column and the transverse processes a system of muscles, forming part of the hyposkeletal system of Huxley, and called by Gegenbaur the subvertebral muscles.
The actual manner in which the amniotic folds meet is somewhat peculiar (His and Koelliker).
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "amniotic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
