Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 3 complete abstracts (557 words), 9 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
The unborn young of a viviparous mammal, in the postembryonic period, after the major structures have been outlined. In humans, the unborn young from the end of the eighth week after conception until birth, as distinguished from the earlier embryo, mammalian.
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Fetuses; Fetal Tissue; Fetal Tissues; Tissue, Fetal; Tissues, Fetal; Mummified Fetus; Fetus, Mummified; Retained Fetus.
Where it fits in the MeSH classification
- Broader topics
- Embryonic Structures
- Narrower topics
- Aborted Fetus; Amniotic Fluid; Fetal Blood; Fetal Heart; Meconium; Umbilical Cord; Vernix Caseosa
- See also
- Fetoscopy; Gestational Age; Maternal-Fetal Exchange; Fetal Research
Related concepts
- Fertilization
- Birth
- Embryo
- Mammalian
Research landscape
PubMed indexes 174,184 records tagged with the MeSH heading “Fetus” (counts retrieved 2026-10-31). 16,928 of them (9.7%) were published from 2020 onward, and the busiest period so far is through 1999 with 98,032 records.
Reviews account for 12,406 records (7.1%) and meta-analyses for 476. Randomized controlled trials number 1,741 (1.0%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.
Show the data
| Period | Records |
|---|---|
| through 1999 | 98,032 |
| 2000-2009 | 30,458 |
| 2010-2019 | 28,766 |
| 2020 onward | 16,928 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 12,406 | 7.1% |
| Meta-analyses | 476 | 0.3% |
| Randomized controlled trials | 1,741 | 1.0% |
Method: PubMed query "Fetus"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-31.
Reading the evidence in anatomy and physiology
Anatomy describes how body structures are built and physiology describes how they normally work, so most findings here are descriptive or mechanistic rather than evidence about treatment. Much of what is known comes from dissection, imaging, tissue studies and experiments in animals, and measurements in healthy volunteers can differ from those in people with disease or at different ages. Normal ranges vary between individuals and populations. Check whether a result was measured in people or in another species, the age and health of the participants, and the method used.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
| Study / authors | Year | Source label / design | Europe PMC citations | Licence / source |
|---|---|---|---|---|
| Single-cell spatiotemporal dissection of the human maternal-fetal interface | 2026 | Research article Design not recorded in structured metadata | 8 | cc by PMID 41951740 · DOI · PMC13149032 |
| Engineered intestinal crypt geometry uncovers YAP1-dependent fetal-to-adult transition | 2026 | Research article Design not recorded in structured metadata | 7 | cc by PMID 41687611 · DOI · PMC12979008 |
| Intrathecal versus intravenous umbilical cord mesenchymal stem cells for ischemic stroke sequelae | 2025 | Randomized controlled trial Design not recorded in structured metadata | 6 | cc by PMID 41277536 · DOI · PMC12641229 |
Single-cell spatiotemporal dissection of the human maternal-fetal interface [1]
Abstract reading summary — source excerpts
- Opening excerpt
- The human maternal-fetal interface is characterized by mosaic intermingling of maternal and fetal cells1.
- Closing excerpt
- This resource provides a comprehensive spatially resolved single-cell multiomic reference of the human placenta and decidua and offers a framework for decoding their normal and disordered development.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (207 words)
The human maternal-fetal interface is characterized by mosaic intermingling of maternal and fetal cells1. Yet the underlying cellular, molecular and spatial programmes remain incompletely defined. Here we generate a comprehensive atlas of the human maternal-fetal interface across normal pregnancies from early gestation to term by integrating large-scale paired single-nucleus transcriptomic and chromatin accessibility profiling with submicrometre-resolution spatial transcriptomics and CODEX multiplex protein imaging2, substantially boosting the spatiotemporal resolution of prior research3. This framework delineates common and transient cell types, states and spatial niches across the fetal and maternal compartments, reconstructs transcriptional programmes that guide cytotrophoblast and decidual stromal cell differentiation, and resolves recurrent architecture structural units that build this interface. We identify previously unrecognized arterial endothelial state transitions during cytotrophoblast-mediated spiral artery remodelling and develop a machine learning model that predicts cytotrophoblast invasiveness from transcriptomic signatures. We further discover a decidual stromal cell subtype that suppresses cytotrophoblast invasion via endocannabinoid signalling at the human maternal-fetal interface. By integrating the atlas with genome-wide association data, we pinpoint maternal and fetal cells that are most vulnerable to pre-eclampsia, preterm birth or miscarriage. This resource provides a comprehensive spatially resolved single-cell multiomic reference of the human placenta and decidua and offers a framework for decoding their normal and disordered development.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41951740 · DOI · PMC13149032
Engineered intestinal crypt geometry uncovers YAP1-dependent fetal-to-adult transition [2]
Abstract reading summary — source excerpts
- Opening excerpt
- During morphogenesis, the intestine undergoes significant structural remodeling, transitioning from a simple tube of immature epithelium into a complex crypt-villus architecture housing mature cell types.
- Closing excerpt
- Our work provides a platform for modeling aspects of intestinal development and offers insights for refining stem cell differentiation protocols and regenerative strategies for intestinal disorders.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (139 words)
During morphogenesis, the intestine undergoes significant structural remodeling, transitioning from a simple tube of immature epithelium into a complex crypt-villus architecture housing mature cell types. However, the relationship between these structural changes and epithelial maturation has remained enigmatic. Using engineered scaffolds that replicate crypt-like geometries, we establish a robust platform for guiding the morphogenesis and differentiation of fetal intestinal cells into mature engineered tissues that mimic their in vivo counterparts. Mechanistically, tissue maturation is driven by cell crowding, leading to reduced YAP1 activation. Modulating YAP signaling in both engineered tissues and the developing mouse intestine alters epithelial lineage specification. These findings uncover a geometry-dependent mechanism that links tissue architecture to cell fate transitions. Our work provides a platform for modeling aspects of intestinal development and offers insights for refining stem cell differentiation protocols and regenerative strategies for intestinal disorders.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41687611 · DOI · PMC12979008
Intrathecal versus intravenous umbilical cord mesenchymal stem cells for ischemic stroke sequelae [3]
Abstract reading summary — source excerpts
- Opening excerpt
- BackgroundStroke is a leading cause of death worldwide.
- Closing excerpt
- Trial registrationNCT05292625.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (211 words)
BackgroundStroke is a leading cause of death worldwide. Traditional treatments have limitations, stem cell therapy has potential for regeneration after ischemic stroke. This study evaluated the safety and efficacy of allogeneic umbilical cord-derived mesenchymal stem cell (UC-MSC) infusion via the intravenous (IV) and intrathecal (IT) routes for treating neurological sequelae after ischemic stroke.MethodsThis phase II randomized controlled trial involved 32 patients aged 40-75 years with neurological sequelae after ischemic stroke. The patients were randomly assigned into two groups: 16 received two IT UC-MSC infusions plus rehabilitation therapy, and 16 received two IV UC-MSC infusions plus rehabilitation therapy. Additionally, 16 matched controls, paired with the IT group by sex, age (±5 years), and NIHSS, received only rehabilitation. UC-MSCs were administered at 1.5 × 106 cells/kg at baseline and 3 months. Outcomes were assessed at baseline, 3, 6, and 12 months using NIHSS, FIM, MAS, FMS, and SF-36.ResultsNo severe adverse events related to UC-MSC therapy were observed. Adverse event rate was lower in the IV group than the IT group. At 6 months, the IV group demonstrated significant improvements in NIHSS (p = 0.046), FIM (p = 0.028), and SF-36 (p ConclusionBoth IV and IT UC-MSC infusions improved neurological recovery and quality of life, with fewer adverse events in the IT group.Trial registrationNCT05292625.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41277536 · DOI · PMC12641229
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article Genome-wide associations for birth weight and correlations with adult disease [4]
- Research article Delayed vs early umbilical cord clamping for preterm infants: a systematic review and meta-analysis [5]
- Research article Strength of association between umbilical cord pH and perinatal and long term outcomes: systematic review and meta-analysis [6]
- Research article Effect of timing of umbilical cord clamping of term infants on maternal and neonatal outcomes [7]
- Research article Variants in the fetal genome near FLT1 are associated with risk of preeclampsia [8]
- Research article Prognostic accuracy of cerebroplacental ratio and middle cerebral artery Doppler for adverse perinatal outcome: systematic review and meta-analysis [9]
References
- Wang C, Zhou Y, Wang Y, Guha TK, Luo Z, Mustafaraj A, et al.. Single-cell spatiotemporal dissection of the human maternal-fetal interface. . 2026. PMID 41951740 · DOI · PMC13149032
- Maimets M, Nikolaev M, Lövkvist C, Bertillot F, Larsen HL, Bressan RB, et al.. Engineered intestinal crypt geometry uncovers YAP1-dependent fetal-to-adult transition. . 2026. PMID 41687611 · DOI · PMC12979008
- Nguyen LT, Nguyen TTN, Nguyen KT, Phung LN, Hoang VT, Phan TTK, et al.. Intrathecal versus intravenous umbilical cord mesenchymal stem cells for ischemic stroke sequelae. . 2025. PMID 41277536 · DOI · PMC12641229
- Horikoshi M, Beaumont RN, Day FR, Warrington NM, Kooijman MN, Fernandez-Tajes J, et al.. Genome-wide associations for birth weight and correlations with adult disease. Nature. 2016. PMID 27680694 · DOI · PMC5164934
- Fogarty M, Osborn DA, Askie L, Seidler AL, Hunter K, Lui K, et al.. Delayed vs early umbilical cord clamping for preterm infants: a systematic review and meta-analysis. Am J Obstet Gynecol. 2018. PMID 29097178 · DOI
- Malin GL, Morris RK, Khan KS. Strength of association between umbilical cord pH and perinatal and long term outcomes: systematic review and meta-analysis. BMJ. 2010. PMID 20466789 · DOI · PMC2869402
- McDonald SJ, Middleton P, Dowswell T, Morris PS. Effect of timing of umbilical cord clamping of term infants on maternal and neonatal outcomes. Cochrane Database Syst Rev. 2013. PMID 23843134 · DOI · PMC6544813
- McGinnis R, Steinthorsdottir V, Williams NO, Thorleifsson G, Shooter S, Hjartardottir S, et al.. Variants in the fetal genome near FLT1 are associated with risk of preeclampsia. Nat Genet. 2017. PMID 28628106 · DOI
- Vollgraff Heidweiller-Schreurs CA, De Boer MA, Heymans MW, Schoonmade LJ, Bossuyt PMM, Mol BWJ, et al.. Prognostic accuracy of cerebroplacental ratio and middle cerebral artery Doppler for adverse perinatal outcome: systematic review and meta-analysis. Ultrasound Obstet Gynecol. 2018. PMID 28708272 · DOI · PMC5873403
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-31.
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Evidence strength
EvidenceHelix's computed view of the study designs behind this topic: how common meta-analyses, randomized trials and reviews are, how recent the literature is, and a plain-language reading. It describes the design mix of the literature. It is not a quality appraisal of any study, and it is not medical advice.