Definitions of placenta

  1. that part of the ovary of a flowering plant where the ovules form
  2. the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus
  3. The vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth.
  4. The part of a pistil or fruit to which the ovules or seeds are attached.
  5. A highly vascular fetal organ through which the fetus absorbs oxygen and other nutrients and excretes carbon dioxide and other wastes. It begins to form about the eighth day of gestation when the blastocyst adheres to the DECIDUA.
  6. 1. The organ of communication between the fetus and the mother; it is formed from the outer layer of the fetal envelopes, or chorion, and is of flat circular form, about the size of a soup- plate, or seven inches in diameter. The fetal surface is smooth and from it proceeds the umbilical cord; the maternal surface is marked by a number of lobules, or cotyledons, which project into sinuses in the wall of the uterus, being there bathed in the maternal blood; by this means the fetal blood receives oxygen and nutriment and gives up waste material, the placenta therefore performing the functions of respiration, nutrition, and excretion. After the expulsion of the child the placenta is called the after- birth. 2. An enlarged spleen, a clot, or other body having a resemblance to a placenta. 3. In botany, the sporophore, the part of the ovary of a plant which contains the ovules.
  7. Membranous sac, with bloody contents from which fetus derives its sustenance; the after birth.
  8. The spongy organ connecting the fetus in the womb with the mother: ( bot.) the part of a plant to which the seeds are attached:- pl. PLACENTAE.
  9. A temporary organ that connects the embryo or foetus to the womb; the afterbirth; the part of a plant to which the seeds are attached.
  10. In anat., the roundish, flat, flesh- like substance in the womb, forming the principal medium of communication between the parent and child, and which, being expelled after the birth, is popularly called the after- birth; in bot., the cellular part of the carpel bearing the ovule.
  11. The ovule- bearing part of the carpel; in eutherian Mammals, a double vascular spongy structure formed by interlocking of foetal and maternal tissue in the uterus, and in which maternal and foetal blood are in close proximity, allowing nutritive and respiratory elements to pass from the former to the latter by osmosis.

Usage examples for placenta

  1. The placenta removed, a new arrangement of the balance of power among the endocrines becomes necessary. – The Glands Regulating Personality by Louis Berman, M.D.
  2. It never enters the blood- vessels of the mother but passes to and from the placenta as long as pregnancy lasts. – The Prospective Mother A Handbook for Women During Pregnancy by J. Morris Slemons
  3. At the time of birth the placenta measures nearly an inch in thickness, is as large around as a breakfast- plate, and generally weighs a pound and a quarter, that is, approximately one- sixth of the weight of the child. – The Prospective Mother A Handbook for Women During Pregnancy by J. Morris Slemons
  4. When it is to be suckled, the calf should be left quietly with the cow: and by licking the calf and eating the placenta the cow will be settled, the calf will get to its legs, and all may be expected to be right. – Cattle and Cattle-breeders by William M'Combie
  5. The women carry the swords for the purpose of frightening the evil spirits, otherwise the latter might get hold of the placenta and make the child sick. – The Khasis by P. R. T. Gurdon
  6. The size and character of the placenta are important qualities. – Tomato Culture: A Practical Treatise on the Tomato by William Warner Tracy
  7. Other causes are laceration of the cotyledons of the womb, or from an antecedent inflammation of the placenta, and the unnatural adhesion of the membranes to the womb, which bleeds when the two are torn apart. – Special Report on Diseases of Cattle by U.S. Department of Agriculture J.R. Mohler
  8. It is evident from the conditions in these mammals that both hair and milk glands were evolved before the placenta. – Hormones and Heredity by J. T. Cunningham
  9. Bang and Stribolt subsequently examined pieces of placenta from a large number of cases of contagious abortion, and found the bacillus microscopically in practically all cases. – Contagious Abortion of Cows by Ward J. MacNeal
  10. This results in a separation between the fetal and maternal placenta. – Common Diseases of Farm Animals by R. A. Craig, D. V. M.
  11. When the placenta is removed, after labor, the post- pituitary can act, and a free flow of milk is established. – The Glands Regulating Personality by Louis Berman, M.D.
  12. It has no placenta, or arrangement by which the blood- vessels of the mother are brought into connection with the blood- vessels of the foetus, in order to supply it with food until it is fully developed. – The Story of Evolution by Joseph McCabe
  13. The placenta in the womb is provided with all the machinery necessary to the preparation of blood, such as is used for all purposes in forming and developing a child. – Philosophy of Osteopathy by Andrew T. Still
  14. No nerves run in the cord and none pass from the uterine tissues to the placenta. – Psychotherapy by James J. Walsh
  15. The placenta is carefully preserved in an earthen vessel in the house till after the naming ceremony has taken place. – The Khasis by P. R. T. Gurdon
  16. Geoffrey graciously accepted the placenta, but utterly declined all further intimacy. – Mistress Margery by Emily Sarah Holt
  17. Pigeons, Lady Torrington's pigeon, 258. Placuna placenta, pearls of, 380. Planaria, 398. See Radiata. – Sketches of the Natural History of Ceylon by J. Emerson Tennent
  18. If pregnancy and the consequent placenta do not occur, it shrinks and turns into a scar, the false corpus luteum. – The Glands Regulating Personality by Louis Berman, M.D.
  19. The placenta is credited with all the varieties of life- giving potency that are attributed to the Mother- Goddess. – The Evolution of the Dragon by G. Elliot Smith