amnions
Embryonic protective membranes
Amnions is the plural of amnion, the innermost membrane surrounding an embryo in reptiles, birds, and mammals.
The amnion forms a fluid-filled sac that protects the developing fetus: The amnions of the twin fetuses were examined by ultrasound.
The alternative plural amnia appears in technical writing.
Study of prenatal development
- gestationCarrying offspring in womb
- fetusGestating offspring
- embryoOrganism before birth
- zygoteFirst embryonic cell
blastocyst · morphogenesis · organogenesis · differentiation · prenatal · conception · implantation · ectoderm
Outer embryonic membrane
- sacBodily pouch structure
- permeabilityAbility to transmit fluids
- semipermeableAllowing partial passage
- osmosisSolvent crossing semipermeable barrier
diffusion · epithelium · tissue · lamina · basement · extracellular · matrix · collagen
Female reproductive organ
- placentaFetal nourishment organ
- pregnancyCarrying developing offspring
- wombFetal development organ
- umbilicalOf the cord connecting fetus
birth · labor · delivery · obstetrics · midwifery · prenatal · natal · neonate
Vertebrates with protective embryo sacs
- vertebratesAnimals with internal skeletons
- reptilesCold-blooded scaly vertebrates
- birdsEgg-laying flying vertebrates
- mammalsHair-bearing, milk-producing animals
tetrapods · egg · terrestrial · adaptation · evolutionary · clade
Softening force or fall
- bufferProtective intermediate space
- barrierObstruction preventing passage
- insulationThermal transfer prevention
- fluidSubstance that flows
shock absorption · buoyancy · enclosure · envelope · shielding · containment · surrounding · encasing
embryology
Study of prenatal development
zygote · blastocyst · morphogenesis · organogenesis · differentiation · prenatal · conception · implantation · ectoderm · mesoderm
chorion
Outer embryonic membrane
- sacBodily pouch structure
- permeabilityAbility to transmit fluids
- semipermeableAllowing partial passage
osmosis · diffusion · epithelium · tissue · lamina · basement · extracellular · matrix · collagen · elastin
uterus
Female reproductive organ
umbilical · birth · labor · delivery · obstetrics · midwifery · prenatal · natal · neonate · maternal
amniotes
Vertebrates with protective embryo sacs
- vertebratesAnimals with internal skeletons
- reptilesCold-blooded scaly vertebrates
- birdsEgg-laying flying vertebrates
mammals · tetrapods · egg · terrestrial · adaptation · evolutionary · clade
cushioning
Softening force or fall
- bufferProtective intermediate space
- barrierObstruction preventing passage
- insulationThermal transfer prevention
fluid · shock absorption · buoyancy · enclosure · envelope · shielding · containment · surrounding · encasing · safeguarding
- amniotic sacMembrane enclosing developing fetus
- amniotic fluidLiquid protecting unborn offspring