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Formation and structure of the placenta
Placentation is the formation, type and structure, or modes of arrangement of the placenta. The function of placentation is to transfer nutrients, respiratory
Placentation
Female organs of a flower
born on a line of placentation at the inner angle of each locule, this is axile placentation. An ovary with free central placentation, on the other hand
Gynoecium
Physiological process in the endometrium
trophoblast cell invasion of the endometrium occurs, also known as hemochorial placentation. This allows maternal blood to come into direct contact with the fetal
Decidualization
Medical condition
attachment to the uterine wall, this is known as abnormal placentation. Abnormal placentation can categorised into 3 types, depending on the depth of infiltration
Antepartum_bleeding
Female plant reproductive structure
patterns of ovule attachment, or placentation, can be found among plant species, these include: Apical placentation: The placenta is at the apex (top)
Ovule
Australian general practitioner and health writer
occurrence of placentation in the scincid lizard, Lygosoma entrecasteauxi.". Proc. Linn. Soc. N.S.W. 50: 472–486. Weekes, H.C. (1927a). Placentation and other
Claire_Weekes
Vascular structure in the placenta
Benirschke (2007). "Placentation". Comparative Placentation. Retrieved 26 February 2026. R. Bowen (8 August 2000). "Placentation in Ruminants (Cattle
Placental_cotyledon
Medical condition
Furuya M, Ishida J, Aoki I, Fukamizu A (2008). "Pathophysiology of placentation abnormalities in pregnancy-induced hypertension". Vasc Health Risk Manag
Placental_disease
World's largest deer
World's Wildlife. DK Adult (2005), ISBN 0789477645 2."Comparative Placentation". Placentation.ucsd.edu. Retrieved 17 August 2012. Geist, Valerius (1998). Deer
Largest_cervids
Group of marsupial mammals
1091650311. PMID 5346723. S2CID 85011250. Krause, W.J. & Cutts, H. (1985). "Placentation in the Opossum, Didelphis virginiana". Acta Anatomica. 123 (3): 156–171
Opossum
Hypertension occurring during pregnancy
fully understood. It is likely related to factors such as: Abnormal placentation (formation and development of the placenta) Immunologic factors Prior
Pre-eclampsia
First stage of pregnancy
stages of implantation including two pre-implantation stages that precede placentation, the first four are similar across the species. The five stages are migration
Implantation_(embryology)
Genus of flowering plants
Erythranthe (species with axile placentation and long pedicels), placed 46 into Diplacus (species with parietal placentation and sessile flowers), placed
Diplacus
Species of carnivorous plant
flower is superior and the flower has regular symmetry. It has basal placentation, with 1 locule and 5 carpels. It flowers mostly in the summer, but in
Plumbago_auriculata
Study of flower structures
and compositae (Asteraceae). There are different types of placentation: Marginal placentation: is typical of a unicarpellate gynoecium (Leguminosae) or
Floral_morphology
Clade of flowering plants
formation* Successive microsporogenesis Syncarpous gynoecium Parietal placentation Monocotyledonous seedling Persistent radicle Haustorial cotyledon tip
Monocotyledon
Order of egg-laying mammals
"Loss of egg yolk genes in mammals and the origin of lactation and placentation". PLOS Biol. 6 (3) e63. doi:10.1371/journal.pbio.0060063. PMC 2267819
Monotreme
Flowering plant reproductive part
grow from placental areas at the interior of the ovary. (This is axile placentation in a bi-locular fruit.) The placentae in Lunaria are along the margins
Ovary_(botany)
Species of flowering plant
Drawing of the structure of Asarum canadense including features such as flower, ovule placentation, leaves, and rhizomes.
Asarum_canadense
Organ that connects the fetus to the uterine wall
where it originated multiple times, including the genus Poeciliopsis. Placentation has also evolved in some reptiles. The mammalian placenta evolved around
Placenta
Genus of plants
seed with a curved embryo developed in a curved ovule with pendulous placentation, a berry anatomy that is similar to that of the genus Phytolacca. Though
Phytolacca
Family of flowering plants
pistil with two carpels. The ovary is superior with two locules. The placentation is axile. Ovules usually 2 per locule; sometimes 4, rarely many. Nectary
Oleaceae
Genus of antelope
Liddell and Scott. Benirschke, Kurt (2002). "Wildebeest, Gnu". Comparative Placentation. University of California San Diego. Retrieved 25 March 2014. Wilson
Wildebeest
Order of flowering plants
an ancestor which was characterized by a plurilocular ovary and axial placentation. This primitive flower might well be found in centrospermal stock as
Caryophyllales
Species of flowering plant
Carples: five, syncarpous, ovary superior, penta or multilocular with axile placentation, one ovule in each locule; style 1, passing through the staminal tube;
Sida_acuta
Family of flowering plants
one to 50 ovules that are anatropous or hemianatropous with axillar placentation. The development of the embryo sack can be the same as for Polygonum
Solanaceae
Eating members of one's own species
Eulitt; Robert L. Jarrell; Matthew A. Kelly (1993). "Uterogestation and placentation in elasmobranchs". Journal of Experimental Zoology. 266 (5): 347–367
Cannibalism
Genus of flowering plants
Erythranthe (species with axile placentation and long pedicels), 46 placed into Diplacus (species with parietal placentation and sessile flowers), two placed
Mimulus
Organic vessel in which an embryo first begins to develop
Patricia (November 2003). "Morphogenesis of extraembryonic membranes and placentation inMabuya mabouya (Squamata, Scincidae)". Journal of Morphology. 258 (2):
Egg
Botanical fruit with fleshy pericarp, containing one or many seeds
from the axis, and so nearer the fruit wall (i.e. by having "parietal placentation" in modern terminology). Nicaise Auguste Desvaux in 1813 used the terms
Berry_(botany)
Family of flowering plants that includes the primroses
having the petals united, stamens opposite the petals, free central placentation, bitegmic (two layered) ovules and nuclear endosperm formation.[clarification
Primulaceae
Species of deer
World's Wildlife. DK Adult (2005), ISBN 0789477645 "Comparative Placentation". Placentation.ucsd.edu. Retrieved 17 August 2012. Boitani, Luigi (1984) Simon
Sambar_deer
Genus of flowering plants
permanent, the stigma widened. The ovary is eightfold and has parietal placentation. The fruit is berry-like, the seeds are elliptical and thick-skinned
Hemitomes
Family of flowering plants comprising rock roses
filaments are free. The ovary is superior, usually with three carpels; placentation is parietal, with two or more ovules on each placenta. The fruit is a
Cistaceae
Group of eudicots known as core eudicots
growth from one carpel to another. The ovules are usually of axillary placentation. The pistil, finally, commonly terminates in a style and a stigma that
Pentapetalae
Historical order of dicotyledous flowering plants
It is a descriptive botanical name for placentae parietales (parietal placentation) that characterised those plants. Thus it could be used even today (for
Parietales
Period during the carrying of an embryo
Schwaha T, Genikhovich G, Ereskovsky AV (August 2016). "Matrotrophy and placentation in invertebrates: a new paradigm". Biological Reviews of the Cambridge
Gestation
Family of plants
and all have ovaries that are superior or half-inferior with parietal placentation. Salicaceae are divided into three subfamilies, with Salicoideae further
Salicaceae
Family of flowering plants
orthotropous, bitegmic, crassinucellated, pendulous, apical to marginal placentation, three or four staminodes 3-4, no nectaries Fruit in an achene, clavate
Platanaceae
Clade of primates endemic to the island of Madagascar
tarsiers) include a bicornuate (two-horned) uterus and epitheliochorial placentation. Because their thumbs are only pseudo-opposable, making their movement
Lemur
Large family of flowering plants
lateral lines. The ovary is inferior and has only one ovule, with basal placentation. In members of the Asteraceae, the fruit is achene-like, and is called
Asteraceae
Genus of flowering plants
three united carpels and an inferior ovary, three locules and axile placentation with fruit that is a loculicidal capsule. Crocus is an acaulescent (lacking
Crocus
Species of mammal
1163/156853983X00354. JSTOR 4534283. Allen, W. (2006). "Ovulation, Pregnancy, Placentation and Husbandry in the African Elephant (Loxodonta africana)". Philosophical
African_bush_elephant
Family of flowering plants in order Liliales, including lilies
style. There are numerous anatropous (curved) ovules which display axile placentation (parietal in Scoliopus and Medeola), usually with an integument and thinner
Liliaceae
Species of rodent
placenta.2003.11.002. PMID 15081638. Oliveira, M.F.; et al. (2006). "Placentation in the rock cavy, Kerodon rupestris (Wied)". Placenta. 27 (1): 87–97
Rock_cavy
Species of plant
is bicarpellary, syncarpous, superior, unilocular, ovule one, basal placentation, style single and filiform, stigma capitate. Fruits: oblong utricle Seeds:
Achyranthes_aspera
Genus of flowering plants
polyphyletic family Flacourtiaceae, but it was abnormal there due to its apical placentation, small embryos, and mucilaginous foliar epidermis. Analyses of DNA data
Gerrardina
Family of flowering plants
apotropous, unitegmic and crasinucelated, horizontal or pendulous, axial placentation. Fruit unilocular or dilocular, asymmetric, dry or drupaceous, indehiscent
Sabiaceae
Family of flowering plants
(syncarpous), with two to numerous ovules in each locule, with axile placentation of the ovules. Heterostyly – the presence of two (distylous) or three
Lythraceae
Genus of plants
1759. Historically, Prockia was characterized by having pseudo-axile placentation (i.e., parietal placentae that intrude into the center of the ovary and
Prockia
Subclass of mammals in the clade Theriiformes
(2015). "Retroviral envelope gene captures and syncytin exaptation for placentation in marsupials". Proceedings of the National Academy of Sciences of the
Theria
Species of carnivore
and produces one litter. The gestation period lasts from 36–43 days. Placentation occurs two weeks after mating, with the blastocyst stage lasting seven
Steppe_polecat
Animal species belonging to Tenrecidae family
Carter, A.M. (July 2007). "Placental Diversity in Malagasy Tenrecs: Placentation in Shrew Tenrecs (Microgale spp.), The Mole-Like Rice Tenrec (Oryzorictes
Mole-like_rice_tenrec
Occurrence of hand dominance among twins
monozygotic twins, the time in which the embryo divide has an impact on placentation. If the split of the embryo occurs within three days of fertilization
Twins_and_handedness
Consumption of a mother by her offspring
Development of the Strepsipteran Xenos vesparum Rossi Matrotrophy and placentation in invertebrates: a new paradigm Absurd Creature of the Week: The Fly
Matriphagy
within a carpel, ovary, or anther. Locule – multicarpellate – Placenta – Placentation – Axile – Basal – Free-central – Pariental – Septum – Simple pistil –
Glossary_of_plant_morphology
Species of mammal
Feb 4, 2023. "Kirk's dik-dik". www.ultimateungulate.com. "Comparative Placentation". Grubb, P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species
Kirk's_dik-dik
Maternal lymphocytes that make up 70% of the total found during pregnancy
circulating natural killer cells from the blood stream. Later during placentation, circulating natural killer cells are thought to be recruited to aid
Uterine_natural_killer_cells
Genus of flowering plants
to lobed. Each locule of the superior ovary has two ovules with axile placentation that are anatropous to campylotropous. The one- to five-pitted fruit
Boswellia
Human hormones produced during pregnancy
complications. During pregnancy, estrogen plays a role in supporting placentation through the modulation of angiogenic factor expression. Also, it develops
Pregnancy_hormones
Species of plant
Journal of the Adelaide Botanic Gardens (29): 23–36. Symon, D. E. (1987). "Placentation patterns and seed numbers in Solanum (Solanaceae) fruits". Journal of
Solanum_petrophilum
Tribe of plants
inferoid, trilocular ovary with numerous anatropic ovules with axillary placentation. The fruit is a loculicidal capsule, umbonate or truncate apically, with
Alstroemerieae
Group of flowering plants
meaning "with the seed in the center", referring to the free (central) placentation. It was used in the Engler system and the Wettstein system) for an order
Centrospermae
Species of flowering plant
celled but at maturity four celled due to the formation of septum, axile placentation, 1 ovule in each chamber; style gynobasic, long; stigma bifid subulate
Leucas_aspera
Family of flowering plants
inferior ovary (rarely secondarily superior, e.g. Gaertnera, Pagamea). Placentation is axial, rarely parietal (e.g. Gardenia); ovules are anatropous to hemitropous
Rubiaceae
Family of flowering plants
and thick; the stigma is apical and capitate, with two to six lobes. Placentation is parietal. Ovules number from two to many in one or two rows on each
Canellaceae
Species of antelope
ISBN 978-0-8018-8221-0. OCLC 62265494. Benirschke, K. "Wildebeest, Gnu". Comparative Placentation. Archived from the original on 15 March 2012. Retrieved 14 January 2014
Blue_wildebeest
Genus of trees
Hasseltia is unique among Salicaceae in that the species have pseudo-axile placentation, compound umbellate inflorescences, and a pair of glands embedded in
Hasseltia
Family of ray-finned fishes
degree of matrotrophy in a species is linked with a higher degree of placentation, including "a thicker maternal follicle, higher degree of vascularization
Poeciliidae
Family of flowering plants
composed of two to many connate carpels. The ovary is superior, with axial placentation, with capitate or lobed stigma. The flowers have nectaries made of many
Malvaceae
Study of how organisms develop and grow
1187945. PMC 3863715. PMID 20595612. Steven DH, ed. (1975). Comparative Placentation. London: Academic Press. Kimelman D, Martin BL (2012). "Anterior-posterior
Developmental_biology
Pregnancy between species
compatibility is related to the type of placentation, as mothers of species having the more invasive hemochorial placentation (such as humans) must create a stronger
Interspecific_pregnancy
Family of flowering plants
occasionally absent and the ovule is fused to the placenta, marginal placentation with various dispositions or apical. Fruit dehiscent or indehiscent,
Proteaceae
Unequal blood supply among multiple fetuses in the womb leading to deformity
causes hypovolemia, resulting in ischemia and poor end-organ perfusion. Placentation Theory: The incidence of velamentous cord insertion, an abnormal insertion
Twin-to-twin transfusion syndrome
Twin-to-twin_transfusion_syndrome
Eulitt, A.M.; Jarrell, R.L. & Kelly, M.A. (1993). "Uterogestation and placentation in elasmobranchs". Journal of Experimental Zoology. 266 (5): 347–367
Pregnancy_in_fish
Family of flowering plants
apotropous, bitegmicous, crassinucelate, pendulous ovules per carpel, placentation marginal in 2 series or apicoaxial. Fruit in ventricidal or slightly
Trochodendraceae
Genus of flowering plants
with a slight spiral twist. The ovary has a single locule with parallel placentation. The stigma is terminal and peltate. The fruit is a capsule that splits
Orphium
Species of plant
fruits are sausage-shaped pods which contain edible pulp. The gelatinous placentation contains seeds surrounded with white pulp that has a sweet flavor.[citation
Akebia_quinata
Species of legume
Illustration of placentation of seeds inside the pods of S. punicea
Sesbania_punicea
Species of plant
single-chambered, usually with 4 ovules, no style, hemispherical stigma, parietal placentation topped with creamy yellow pistillodes. Upper organs polycyclic, neutral
Arum_cyrenaicum
Species of mammal
A.C.; Jones, C.J.P.; Taylor, P.J.; Carter, A.M. (September 2009). "Placentation in the Egyptian Slit-faced Bat Nycteris thebaica (Chiroptera: Nycteridae)"
Egyptian_slit-faced_bat
Viral elements in human DNA
DG; Sison, A; Bagasra, O (July 2009). "Role of HERV-W syncytin-1 in placentation and maintenance of human pregnancy". Appl. Immunohistochem Mol Morphol
Human_endogenous_retrovirus-W
Common ancestor evolutionary evidence
"Loss of Egg Yolk Genes in Mammals and the Origin of Lactation and Placentation", PLOS Biology, 6 (3) e63, doi:10.1371/journal.pbio.0060063, PMC 2267819
Evidence_of_common_descent
Family of flowering plants
to many pistils, distinct to connate, with stigmas distinct. Marginal placentation, each pistil bearing one locule, with one to many ovules. Style short
Annonaceae
Virus-derived DNA in another organism
retroviruses to bona fide cellular genes: role of the captured syncytins in placentation". Placenta. 33 (9): 663–671. doi:10.1016/j.placenta.2012.05.005. PMID 22695103
Endogenous_viral_element
Medical condition
PMID 15743856. Norwitz ER (October 2006). "Defective implantation and placentation: laying the blueprint for pregnancy complications". Reprod. Biomed. Online
Gestational_hypertension
Family of flowering plants
glandular disk at the base of the gynoecium, and flowers have parietal placentation. The inflorescence is cymose, with simple or complex cymes. The fruits
Gentianaceae
Part of uterus modified in pregnancy
hormones, estrogen and progesterone. In animals exhibiting hemochorial placentation, the endometrium undergoes decidualization following implantation. If
Decidua
Protein family
"Loss of Egg Yolk Genes in Mammals and the Origin of Lactation and Placentation". PLOS Biology. 6 (3): e63. doi:10.1371/journal.pbio.0060063. PMC 2267819
Vitellogenin
Family of flowering plants comprising the acanthus
the corolla, and the ovary is superior and bicarpellated, with axile placentation. The fruit is a two-celled capsule, dehiscing somewhat explosively. In
Acanthaceae
Genus of flowering plants
also pepos. The seeds, which are attached to the ovary wall (parietal placentation) and not to the center, are large and fairly flat with a large embryo
Cucurbita
Knotweed family of flowering plants
produces only one ovule. The ovary is superior with basal or free-central placentation. The seeds are usually, but not always, 3-sided. The gynoecium terminates
Polygonaceae
Topics referred to by the same term
surface of the parietal bone Parietal cell, in the stomach Parietal placentation, refers to the formation, type and structure, or arrangement of placentas
Parietal
Species of plant
partially to fully divided into 2–5 locules, with axile or parietal placentation. The fruit is a capsule, typically ovoid and dehiscing longitudinally
Hypericum_microsepalum
Species of tree
the calyx are connately joined. The ovary is superior with an axile placentation, two locules and two carpels. The tree is native to the Caribbean, notably
Tabebuia_heterophylla
Species of flowering plant
and have glabrous filaments. The ovary is one-loculed with parietal placentation. The fruit is an ellipsoid-globose berry that becomes nodding at maturity
Monotropa_callistoma
Suborder of flowering plants
tepals, 5) pollen with spinulose and tubuliferous/punctate exine, 6) placentation free-central to basal, curved embryo, and 7) presence of perisperm with
Caryophyllineae
research into the immunology of trophoblast invasion and its role in placentation for over 25 years. She became a fellow of the Royal College of Obstetricians
Department of Pathology, University of Cambridge
Department_of_Pathology,_University_of_Cambridge
Genus of flowering plants
bundles in the lower left of the picture bend in the periphery, so the placentation is not parietal but involute." Holstein (2015): "a Ripening fruit of
Coccinia
Family of flowering plants
and margins that are smooth. Ovaries are superior, often with parietal placentation. The style is undivided and straight, and the stigma is often lobed.
Pittosporaceae
PLACENTATION
PLACENTATION
PLACENTATION
PLACENTATION
Girl/Female
Indian, Telugu
Kind of Things
Boy/Male
Arabic
One who serves a merciful man.
Girl/Female
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Goddess Paravati
Girl/Female
American, Australian, British, English, Hebrew
Sea of Bitterness; Derived from Mary; Bitter
Surname or Lastname
English
English : patronymic from Clark.
Boy/Male
Arabic
Great; Vast; Superior
Boy/Male
Hindu, Indian, Kannada, Sanskrit, Telugu
Lord of Strength
Boy/Male
Sikh
Dignity
Male
English
Anglicized form of Hebrew Eliyphelet, ELPALET means "my God is deliverance."Â
Girl/Female
Arabic, Islamic, Malaysian, Muslim, Pakistani, Romanian, Urdu
Shining; Beautiful; Great Fullness
PLACENTATION
PLACENTATION
PLACENTATION
PLACENTATION
PLACENTATION
n.
The mode in which the placenta is arranged or composed; as, axile placentation; parietal placentation.
n.
The mode of formation of the placenta in different animals; as, the placentation of mammals.