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placentas

placentas Sentence Examples

  • c, The one-celled ovary cut a, The anther, con transversely, having three taining pollen parietal placentas.

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  • below upwards and leaving the placentas with the seeds attached to the replum or framework of the septum.

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  • The ovary is incompletely divided into many chambers by the ingrowth of the placentas which bear numerous ovules and form in the fruit a many-seeded short capsule opening by small valves below the upper edge.

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  • The ovary of passionflowers is one-celled with three parietal placentas, and bears at the top three styles, each capped by a large button-like stigma.

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  • The flowers spring from, or are enclosed in, a spathe, and are unisexual and regular, with generally a calyx and corolla, each of three members; the stamens are in whorls of three, the inner whorls are often barren; the two to fifteen carpels form an inferior ovary containing generally numerous ovules on often large, produced, parietal placentas.

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  • In many cases, however, the placentas are formations from the axis (axile), and are not connected with the carpellary leaves.

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  • This is seen in cases where the margins of the carpel do not unite, but remain separate, and consequently two placentas are formed in place of one.

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  • apocarpous, there are generally separ ate placentas at each of their margins.

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  • - Diagrammatic section of a five-carpellary ovary, in which the edges of the carpels, bearing the placentas and ovules o, are not folded inwards.

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  • The placentas are parietal, and the ovules appear sessile on the walls of the ovary.

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  • In these cases the marginal placentas meet in the axis, and unite so as to form a single central one (figs.

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  • In these instances the placentas may be formed at the margin of the united contiguous leaves, so as to appear single, or the margins may not be united, each developing a placenta.

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  • - Diagrammatic section of a five-carpellary ovary, in which the septa (s) proceed inwards for a certain length, bearing the placentas and ovules (o).

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  • In this case the ovary is unilocular, and the placentas are parietal.

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  • From the centre, processes go to circumference, ending in curved placentas bearing the ovules.

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  • Free central placentation, there fore, has been accounted for in two ways: either by supposing that the placentas in the early state were formed on the margins of 2 FIG.

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  • carpellary leaves, and that in the progress of development these leaves separated from them, leaving the placentas and ovules free in the centre; or by supposing that the placentas are not marginal but axile formations, produced by an elongation of the axis, and the carpels verticillate leaves, united together around the axis.

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  • At other times they are vertical, as in Datura, where the ovary, in place of being two-celled, becomes four-celled; in Cruciferae, where the prolongation of the placentas forms a vertical partition; in Astragalus and Thespesia, where the dorsal suture is folded inwards; and in Oxytropis, where the ventral suture is folded inwards.

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  • The early scans had shown two separate placentas - one each side of the uterus.

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  • c, The one-celled ovary cut a, The anther, con transversely, having three taining pollen parietal placentas.

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  • below upwards and leaving the placentas with the seeds attached to the replum or framework of the septum.

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  • The ovary is superior and one-celled, with three parietal placentas and numerous ovules; it bears a single style, which ends in a dilated or hood-like stigma (fig.

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  • 5), the perianth which is generally petaloid occupying the two outer whorls, followed by two whorls of stamens, with a superior ovary of three carpels in the centre of the flower; the ovary is generally three-chambered and contains an indefinite number of anatropous ovules on axile placentas (see fig.

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  • It was the scene of two naval battles of the t Transverse section of the fruit of the melon (Cucumis melo), showing the placentas (p1), with the seeds attached to them.

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  • The ovary is incompletely divided into many chambers by the ingrowth of the placentas which bear numerous ovules and form in the fruit a many-seeded short capsule opening by small valves below the upper edge.

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  • The ovary of passionflowers is one-celled with three parietal placentas, and bears at the top three styles, each capped by a large button-like stigma.

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  • The flowers spring from, or are enclosed in, a spathe, and are unisexual and regular, with generally a calyx and corolla, each of three members; the stamens are in whorls of three, the inner whorls are often barren; the two to fifteen carpels form an inferior ovary containing generally numerous ovules on often large, produced, parietal placentas.

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  • In many cases, however, the placentas are formations from the axis (axile), and are not connected with the carpellary leaves.

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  • This is seen in cases where the margins of the carpel do not unite, but remain separate, and consequently two placentas are formed in place of one.

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  • apocarpous, there are generally separ ate placentas at each of their margins.

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  • - Diagrammatic section of a five-carpellary ovary, in which the edges of the carpels, bearing the placentas and ovules o, are not folded inwards.

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  • The placentas are parietal, and the ovules appear sessile on the walls of the ovary.

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  • In these cases the marginal placentas meet in the axis, and unite so as to form a single central one (figs.

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  • When the carpels in a syncarpous pistil do not fold inwards so that the placentas appear as projections on the walls of the ovary, then the ovary is unilocular (fig.

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  • 95) and the placentas are parietal, as in Viola (fig.

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  • In these instances the placentas may be formed at the margin of the united contiguous leaves, so as to appear single, or the margins may not be united, each developing a placenta.

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  • - Diagrammatic section of a five-carpellary ovary, in which the septa (s) proceed inwards for a certain length, bearing the placentas and ovules (o).

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  • In this case the ovary is unilocular, and the placentas are parietal.

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  • - Transverse section of the fruit of the Melon (Cucumis Melo), showing the placentas with the seeds attached to them.

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  • From the centre, processes go to circumference, ending in curved placentas bearing the ovules.

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  • may fold inwards very slightly, or they may be applied in a valvate manner, merely touching at their margins, the placentas then being parietal (fig.

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  • Cases occur, however, in which the placentas are not connected with the walls of the ovary, and form what is called a free central placenta (fig.

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  • Free central placentation, there fore, has been accounted for in two ways: either by supposing that the placentas in the early state were formed on the margins of 2 FIG.

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  • carpellary leaves, and that in the progress of development these leaves separated from them, leaving the placentas and ovules free in the centre; or by supposing that the placentas are not marginal but axile formations, produced by an elongation of the axis, and the carpels verticillate leaves, united together around the axis.

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  • At other times they are vertical, as in Datura, where the ovary, in place of being two-celled, becomes four-celled; in Cruciferae, where the prolongation of the placentas forms a vertical partition; in Astragalus and Thespesia, where the dorsal suture is folded inwards; and in Oxytropis, where the ventral suture is folded inwards.

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  • Fraternal twins are easy to identify on an ultrasound as they always have their own placentas.

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  • Retained placentas may also be a problem.

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  • Watch for the placentas, and make sure each one comes out after the birth of the last kitten.

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  • The implantation of several embryos and placentas in the endometrium of the uterus results in a competition for space and inevitably some implant in an area without good circulation.

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  • If the two fetuses have separate amniotic sacs, they can either share a placenta or have two separate placentas.

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  • The day the egg splits determines whether your twins will have one large placenta they share with two umbilical cords or two separate placentas.

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