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Inner germ layer of embryonic development
Endoderm is the innermost of the three primary germ layers in the very early embryo. The other two layers are the ectoderm (outside layer) and mesoderm
Endoderm
Primary layer of cells in embryonic development
an endoderm, and are known as diploblasts. But most animals have a bilateral symmetry, and develop from three germ layers, an ectoderm, endoderm, and
Germ_layer
Outer germ layer of embryonic development
outermost layer, and is superficial to the mesoderm (the middle layer) and endoderm (the innermost layer). It emerges and originates from the outer layer of
Ectoderm
Phase of embryonic development
organogenesis, the three germ layers formed from gastrulation (the ectoderm, endoderm, and mesoderm) form the tissues and internal organs of the organism. The
Organogenesis
Embryonic inner cell mass tissue that forms the yolk sac and, later, chorion
the precursors of both the endoderm and mesoderm. In birds and mammals, it contains precursors to the extraembryonic endoderm of the yolk sac. In chick
Hypoblast
splanchnic) layer adheres to the endoderm, and with it forms the splanchnopleure (mesoderm external to the coelom plus the endoderm). somatopleure mesenchyme
Splanchnopleure
Embryologic stage in which germ layers form
germ layers are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). These germ layers form as epiblast cells move through the
Gastrulation
cells. These cells are constituents of three primary germ layers, the endoderm, mesoderm, and ectoderm. The science of the microscopic structures of the
Histogenesis
State of having two germ layers in embryonic development
early embryo in which there are two primary germ layers: the ectoderm and endoderm. Diploblasts are the organisms which develop with two germ layers, and
Diploblasty
Protein-coding gene in the species Homo sapiens
regulatory elements. The DMR in particular bears the most distal definitive endoderm-specific enhancer at the SOX17 locus. SOX17 itself has recently been defined
SOX17
Embryonic cell structure
(primitive ectoderm) and a lower layer called the hypoblast (primitive endoderm), which will eventually form into fetus. These two layers of cells are
Bilaminar_embryonic_disc
derived from the three embryonic germ layers – ectoderm, mesoderm, and endoderm. Trichocyte Keratinocyte Gonadotrope Corticotrope Thyrotrope Somatotrope
List of human cell types derived from the germ layers
List_of_human_cell_types_derived_from_the_germ_layers
Chan Zuckerberg Initiative. Retrieved 2024-07-05. Gilbert SF (2000). "Endoderm". Developmental Biology (6th ed.). Sinauer Associates. ISBN 978-0-87893-243-6
List_of_human_cell_types
Anterior part of the gastrointestinal tract
attached to the abdominal walls by mesentery. The foregut arises from the endoderm, developing from the folding primitive gut, and is developmentally distinct
Foregut
Membranous sac attached to an embryo
the front (ventral) part of the embryo; it is lined by extra-embryonic endoderm, outside of which is a layer of extra-embryonic mesenchyme, derived from
Yolk_sac
Cells that give rise to the embryo in amniote development
differentiation into the three primary germ layers, ectoderm, mesoderm and endoderm, during gastrulation. The amniotic ectoderm and extraembryonic mesoderm
Epiblast
Body of tissue present in the development of the reproductive system
should not be confused with the sinus tubercle which is a proliferation of endoderm induced by paramesonephric ducts. Even after the phallus is developed (either
Genital_tubercle
embryonic foregut endoderm that gives rise to the parenchyma of the liver and the bile duct. It typically differentiates from the endoderm in the third or
Hepatic_diverticulum
Process by which animal embryos form and develop
surface of the inner cell mass, a layer of flattened cells, called the endoderm, is differentiated and quickly assumes the form of a small sac, called
Animal_embryonic_development
Mechanisms that form the endocrine system
arise from the mesoderm. In contrast, endocrine glands that arise from the endoderm and ectoderm produce the amine, peptide, and protein hormones. The fetal
Development of the endocrine system
Development_of_the_endocrine_system
Development process of some animals
(outermost) and the endoderm (innermost) layers. The mesoderm begins to form as two "pockets" of tissue (one above the endoderm, and one below) are formed
Enterocoely
American embryologist and academic
neural crest - in Hall's view - plays a role equivalent to that of the endoderm, mesoderm, and ectoderm of bilaterian development and is a definitive feature
Brian_K._Hall
Organism composed of cells of different genotypes
parts, mainly the trophectoderm, the inner cell mass, and the primitive endoderm. Each of these parts of the blastocyst gives rise to different parts of
Chimera_(genetics)
Anatomical structure
middle layer of the three germ layers, between the outer ectoderm and inner endoderm. During the third week of embryonic development the lateral plate mesoderm
Lateral_plate_mesoderm
Biological kingdom
chamber and two separate germ layers, an external ectoderm and an internal endoderm. In most cases, a third germ layer, the mesoderm, also develops between
Animal
Period of reproduction
the fetus, the ectoderm, mesoderm, and endoderm, develop. The narrow line of cells begin to form the endoderm and mesoderm. The ectoderm begins to grow
Pregnancy_(mammals)
Rejected phylum of animals
simple tissue organization, with only two layers of cells (ectoderm and endoderm), along with a middle undifferentiated layer called the mesoglea, and radial
Coelenterata
Flexible rod-shaped structure in all chordates
On the ventral aspect of the neural groove, an axial thickening of the endoderm takes place. (In bipedal chordates, e.g. humans, this surface is properly
Notochord
Middle germ layer of embryonic development
most animals. The outer layer is the ectoderm, and the inner layer is the endoderm. The mesoderm forms mesenchyme, mesothelium and coelomocytes. Mesothelium
Mesoderm
Multicellular diploid eukaryote in its earliest stage of development
three germinal layers that form are called the ectoderm, mesoderm, and endoderm. All tissues and organs of a mature animal can trace their origin back
Embryo
Structure formed around day 5 of mammalian embryonic development
embryoblast, gives rise to the primitive endoderm and the embryo proper (epiblast). The primitive endoderm develops into the amniotic sac which forms
Blastocyst
Genus of molluscs
the family Pyramidellidae. They have bilateral symmetry and only have endoderm and ectoderm tissues.[citation needed] The species of this genus are ectoparasites
Agatha_(gastropod)
Proliferation of endoderm induced by the paramesonephric ducts
known as sinual tubercle or Müllerian eminence) is the proliferation of endoderm induced by the paramesonephric ducts. It is located in the developing fetus
Sinus_tubercle
One of two forms found in the phylum Cnidaria (zoology)
technically as the ectoderm, with the inner layer as the endoderm (or gastroderm). Between ectoderm and endoderm is a supporting layer of structureless gelatinous
Polyp_(zoology)
Endocrine gland
from it. The parathyroid glands originate from the interaction of the endoderm of the third and fourth pouch and neural crest mesenchyme. The position
Parathyroid_gland
development of the urinary and reproductive organs. It is formed by ectoderm and endoderm coming into contact with each other. As the human embryo grows and caudal
Cloacal_membrane
Anatomical structure of the embryo
cranial mesoderm. STAGE 6 The prechordal plate is a thickening of the endoderm at the cranial end of the primitive streak seen in Embryo Beneke by Hill
Prechordal_plate
The region where the crescentic masses of the ectoderm and endoderm come into direct contact with each other constitutes a thin membrane, the buccopharyngeal
Buccopharyngeal_membrane
Animals with embryonic bilateral symmetry
exceptions, bilaterian embryos are triploblastic, having three germ layers: endoderm, mesoderm and ectoderm, and have complete digestive tracts with a separate
Bilateria
Protein-coding gene in the species Homo sapiens
that is encoded by the CDX1 gene. CDX-1 is expressed in the developing endoderm and its expression persists in the intestine throughout adulthood. CDX-1
Homeobox_protein_CDX-1
State of having three germ layers in embryonic development
which there are three primary germ layers: the ectoderm, mesoderm, and endoderm. Germ cells are set aside in the embryo at the blastula stage, and are
Triploblasty
Branch of biology, studying prenatal biology
germ layers, endoderm, mesoderm and ectoderm); from them all the bodily organs and tissues subsequently arise. The innermost layer, or endoderm, gives rise
Embryology
Mechanisms that form the digestive system in the human embryo
system and the parenchyma of its derivatives, which originate from the endoderm. Connective tissue, muscular components, and peritoneal components originate
Development of the human digestive system
Development_of_the_human_digestive_system
Development and formation of the human embryo
disc, the gastrula. The three germ layers are the ectoderm, mesoderm and endoderm, and are formed as three overlapping flat discs. It is from these three
Human_embryonic_development
trachea ventrally and the esophagus dorsally. The tube is lined by an endoderm, from which the epithelial lining of the respiratory tract is developed
Laryngotracheal_groove
Anatomical structure in a developing embryo
invagination transforms into a deeper, narrower pouch formed by the gastrula's endoderm. This pouch narrows and lengthens to become the archenteron, a process
Archenteron
Structure in the embryo
by the cloacal membrane, formed by the apposition of the ectoderm and endoderm, and reaching, at first, as far forward as the future umbilicus. Behind
Cloaca_(embryology)
Protein-coding gene in the species Homo sapiens
the HESX1 gene. Expression of HEX1 and HESX1 marks the anterior visceral endoderm of the embryo. The AVE is an extra-embryonic tissue, key to the establishment
HESX1
of the blastoderm begins the formation of the ectoderm, mesoderm, and endoderm. The blastoderm is formed when the oocyte plasma membrane begins cleaving
Blastoderm
Stem cell-based embryo model
primitive endoderm cells, thus comprising analogs of the three founding cell types of the conceptus (epiblast, trophoblast and primitive endoderm), and recapitulate
Blastoid_(embryoid)
from hypoblasts and area opaca endoderm. The blastoderm is a single layer of cells, and the hypoblast and area opaca endoderm cells lie directly below the
Koller's_sickle
Taxonomy to categorize human physiques
terms borrowing from the three germ layers of embryonic development: The endoderm (which develops into the digestive tract), the mesoderm (which becomes
Somatotype and constitutional psychology
Somatotype_and_constitutional_psychology
Type of germ cell tumor
from all three germ layers: mesoderm (immature cartilage - left-upper), endoderm (gastrointestinal glands - center-bottom) and ectoderm (epidermis - right)
Teratoma
Genus of worms
tract, with a pseudocoelom (body cavity made up of only an ectoderm and endoderm). The genus was first recognised in a larval form in 1835. The L1 larvae
Trichinella
Study of the structure of organisms
simpler invertebrates which are formed from two germ layers of ectoderm and endoderm are called diploblastic and the more developed animals whose structures
Anatomy
Polish embryologist and neurologist (1815–1865)
Ernst von Baer's four germ layers to three: the ectoderm, mesoderm, and endoderm. He also discovered unmyelinating Schwann cells that surround peripheral
Robert_Remak
exists as three different germ layers – the ectoderm, the mesoderm and the endoderm. These layers are arranged on top of each other, giving rise to the name
Trilaminar_embryonic_disc
Medical condition
development of an esophageal inlet patch may occur due to the misplacement of endoderm from the stomach early in development. Often esophageal inlet patches causes
Esophageal_inlet_patch
Embryonic structure
the connecting stalk contains the allantois as a diverticulum of hindgut endoderm along with umbilical vessels. Anomalies are usually referred to as body
Connecting_stalk
Last part of the digestive system in vertebrates
parasympathetic supply: vagus & sacral plexus (S2-S4)[citation needed] The endoderm, mesoderm and ectoderm are germ layers that develop in a process called
Large_intestine
Pluripotent stem cell generated directly from a somatic cell
multiple lineages containing tissue derived from the three germ layers endoderm, mesoderm and ectoderm; this is unlike other tumors, which typically are
Induced_pluripotent_stem_cell
Embryological process forming the neural tube
to neurulation, during the migration of epiblastic endoderm cells towards the hypoblastic endoderm, the notochordal process opens into an arch termed
Neurulation
Process in embryonic development
largest endoderm cells induce the invagination process in the tunicates. Invagination consists of the internal movements of a sheet of cells (the endoderm) based
Invagination
Type of stem cell
cells are multipotent stem cells originating from the developing fore-gut endoderm which have the ability to differentiate into the lineage specific progenitors
Pancreatic_progenitor_cell
Gamete-producing cell
Wunen proteins are chemorepellents that lead the germ cells away from the endoderm and into the mesoderm. After splitting into two populations, the germ cells
Germ_cell
German quack physician (1935–2017)
or ulceration), or functional impairment—with the embryonic germ layer (endoderm, mesoderm or ectoderm) from which both the organ tissues and the corresponding
Ryke_Geerd_Hamer
Hard structure of the mouth
and integrated into the mouth (called the "outside–in" theory), or from endoderm pharyngeal teeth (primarily formed in the pharynx of jawless vertebrates)
Tooth
gastrula forms three distinct germ layers, the ectoderm, mesoderm and endoderm. The ectoderm will eventually develop into the outer layer of skin and
Development_of_the_human_body
Ability of a cell to differentiate into other cell types
which can later develop into any of the three germ layers of a human (endoderm, mesoderm, or ectoderm), or into cells of the placenta (cytotrophoblast
Cell_potency
Abdominal wall birth defect
flat disc that consists of three layers, the outer ectoderm and inner endoderm separated by a middle layer called the mesoderm. The ectoderm gives rise
Omphalocele
Mechanisms that form the reproductive system
germinal epithelium. The immature ova originate from cells from the dorsal endoderm of the yolk sac. Once they have reached the gonadal ridge they are called
Development of the reproductive system
Development_of_the_reproductive_system
DNA sequence that binds activators to increase the likelihood of gene transcription
in development, Fox1-driven Nodal expression establishes the visceral endoderm. Later in development, Fox1 binding to the ASE drives Nodal expression
Enhancer_(genetics)
Protein found in humans
functions seem to be similar. Cerberus is secreted by the anterior visceral endoderm and blocks the action of BMP, Nodal and Wnt, secreted by the primitive
Cerberus_(protein)
Study of how organisms develop and grow
creating the three germ layers of the early embryo (ectoderm, mesoderm, and endoderm) and for building up complex structures during organ development. Tissue
Developmental_biology
Cancer of epithelial cells with glandular origin or characteristics
can be derived embryologically from any of the germ layers (ectoderm, endoderm, or mesoderm). To be classified as adenocarcinoma, the cells do not necessarily
Adenocarcinoma
Extinct Cambrian group of animals
ancestor of deuterostomes. However, ascidian larvae have been noted to have endoderm extending to the terminal end, which could suggest that the ancestral tunicate
Vetulicolia
Biological process
cells. The mesoderm and endoderm then migrate animally along the blastocoel roof, driven in part by movement of the vegetal endoderm cells. In Xenopus embryos
Vegetal_rotation
Vertebrate organ involved in metabolism
origins of the liver lie in both the ventral portion of the foregut endoderm (endoderm being one of the three embryonic germ layers) and the constituents
Liver
Muscular organ in the mouth of most vertebrates
pharyngeal arch). The hypopharyngeal eminence develops mainly by the growth of endoderm from the third pharyngeal arch. The boundary between the two parts of the
Tongue
Structure in early amniote embryogenesis
they will differentiate into the mesoderm germ layer that, together with endoderm and ectoderm germ layers, will give rise to all the tissues of the adult
Primitive_streak
Organ of hearing and balance
ectoderm, endoderm and mesenchyme. Around its second to third week, the developing embryo consists of three layers: ectoderm, mesoderm, and endoderm. The first
Ear
tissues are separated into two layers: the splanchnopleure composed of the endoderm and splanchnic mesoderm, and the somatopleure composed of the ectoderm
Somatopleure
Smooth tissue lining body cavities
trilaminar embryo consists of three relatively flat layers of ectoderm, endoderm, and mesoderm. As the embryo develops, the mesoderm starts to segment into
Serous_membrane
embryo; e.g. an embryonated hen's egg, as opposed to an unfertilized egg. endoderm endometrium epiblast epiboly estrous cycle Fallopian tubes false amnion
Glossary of developmental biology
Glossary_of_developmental_biology
Organisational structure in early vertebrate embryogenesis
region, and that immigrate through Hensen's node, contribute to foregut endoderm and prechordal plate. Cells involuting further laterally in the blastopore
Primitive_node
Identification of different areas of development in an early embryo
up during cleavage. The micromeres induce the nearby tissue to become endoderm while the animal cells are specified to become ectoderm. The animal cells
Regional_differentiation
American biologist
Kenneth S. (June 18, 1999). "Initiation of Mammalian Liver Development from Endoderm by Fibroblast Growth Factors". Science. 284 (5422): 1998–2003. doi:10.1126/science
Kenneth_Zaret
Stage of the development of the tongue
weeks of embryogenesis. The hypopharyngeal eminence forms mostly from the endoderm of the third pharyngeal arch and only partially from the fourth pharyngeal
Hypopharyngeal_eminence
Metaclass used to distinguish between cell forms
specialized and form the three primary germ layers: ectoderm, mesoderm, and endoderm. After formation of the three germ layers, cells will continue to specialize
Cell_type
Embryological structure
(from ectoderm) pharyngeal arches (from mesoderm) pharyngeal pouches (from endoderm) and related membranes. "Medcyclopaedia – Branchial apparatus". Retrieved
Pharyngeal_apparatus
Mammalian protein found in Homo sapiens
anteriorly, anterior visceral endoderm (AVE) develops as the first wave of Nodal induces migration of visceral endoderm relative to the primitive node
Nodal_homolog
Neuroendocrine cells in the thyroid
the entire follicle. Parafollicular cells are derived from pharyngeal endoderm. Embryologically, they associate with the ultimopharyngeal body, which
Parafollicular_cell
Phylum of animals
They are triploblasts (meaning they have the three germ layers: ectoderm, endoderm, and mesoderm). Their body plan is acoelomate – they lack a coelom – do
Xenacoelomorpha
Cells usually found in glandular epithelium
myoepithelial cells as one of the malignant components. It can be found in endoderm or ectoderm. Myoepithelial cells are true epithelial cells positive for
Myoepithelial_cell
Marine invertebrates of the subphylum Anthozoa
known technically as the ectoderm, the inner layer as the endoderm. Between ectoderm and endoderm is a supporting layer of gelatinous substance termed mesoglea
Coral
Phylum of aquatic animals
Consequently, these are analogous, but not homologous, to ectoderm and endoderm – the "external" and "internal" cell layers in eumetazoans – i.e. the structures
Placozoa
Organ that allows fish to breathe underwater
thought to have occurred through two diverging lines: gills formed from the endoderm, as seen in jawless fish species, or those form by the ectoderm, as seen
Fish_gill
Origination and development of an organism
triploblastic organisms, meaning the gastrula comprises three germ layers; the endoderm (inner layer), mesoderm (middle layer), and ectoderm (outer layer). As
Ontogeny
Main body cavity in many animals
wall or ectoderm, forming the parietal layer and the second surrounds the endoderm or alimentary canal forming the visceral layer. The space between the parietal
Coelom
Unspecialized biological cell that can become specialized
differentiation into the three germ layers – the ectoderm, mesoderm and endoderm – at the gastrulation stage. However, when they are isolated and cultured
Stem_cell
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