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Multi-Fetal Pregnancy
By: Corinne DeRuiter
| Published: Jan 01, 2012
In humans, multi-fetal pregnancy occurs when a mother carries more than one fetus during the pregnancy. The most common multi-fetal pregnancy is…
ReproductionFetusHuman Development
Fate Mapping Techniques
By: Corinne DeRuiter
| Published: Nov 19, 2010
For more than 2000 years, embryologists, biologists, and philosophers have studied and detailed the processes that follow fertilization. The…
TechnologyCell Lineage
Conjoined Twins
By: Corinne DeRuiter
| Published: Nov 03, 2011
Conjoined twins are twins whose bodies are anatomically joined in utero. The degree to which the twins are attached can range from simple, involving…
Twins, ConjoinedReproductionFetus
Hensen's Node
By: Maria Doty, Corinne DeRuiter
| Published: Jun 21, 2011
A node, or primitive knot, is an enlarged group of cells located in the anterior portion of the primitive streak in a developing gastrula. The node…
GastrulationChicks
Fate Map
By: Corinne DeRuiter
| Published: Sep 08, 2010
Early development occurs in a highly organized and orchestrated manner and has long attracted the interest of developmental biologists and…
Cell Lineage
Gastrulation in Gallus gallus (Domestic Chicken)
By: Corinne DeRuiter, Maria Doty
| Published: Jun 21, 2011
Gastrulation is an early stage in embryo development in which the blastula reorganizes into three germ layers: the ectoderm, the mesoderm, and the…
GastrulationChicks
Congenital Vertebral Defects
By: Corinne DeRuiter
| Published: Sep 12, 2010
The spinal column is the central structure in the vertebrate body from which stability, movement, and posture all derive. The vertebrae of the spine…
Congenital, Hereditary, and Neonatal Diseases and AbnormalitiesReproductionVertebratesCongenital Disorders