The triploblastic body plan derives from three embryonic germ layers: the endoderm, mesoderm
, and ectoderm.
Group 1: The embryonic development of the female reproductive tract begins in the intermediate mesoderm
in the neuron period.
Role of the somatic mesoderm
in the development of the thorax in bird embryos II.
Mutation in these genes prevents normal interaction between the ectoderm and mesoderm
and impairs the normal development of hair, sweat glands and the teeth.
Final histology confirmed the diagnosis of a mature teratoma, with presence of tissues from all three germ layers (e.g., stratified squamous epithelium with adnexal structures (ectoderm), skeletal muscle (mesoderm
), and ciliated respiratory epithelium (endoderm)).
During the growth of the embryo, the metanephric mesoderm
, initially located near the cloaca, gradually ascends to a more cephalad position, in the retroperitoneal area; as such, the blood supply will directly be from the aorta, whereas the more caudal supplying branches vanish.
The following markers were used to determine differentiation efficiency: brachyury (R&D Systems) for mesoendoderm, Nkx2.5 (Abcam) for cardiac mesoderm
, Nkx2.5 and Isl1 (Developmental Studies Hybridoma Bank) for cardiac progenitors, cTnT (Thermo Fisher Scientific) for cardiomyocytes, double staining of FOXA2 (GeneTex) and SOX17 (GeneTex) for endoderm, CDX2 (GeneTex) for mid/hindgut, Otx2 (R&D Systems) for day 5 neural induction, and PAX6 (GeneTex) for neuroepithelium [17-20].
The branchial apparatus consists of six grooves (ectoderm), arches (mesoderm
), and pouches (endoderm).
Benign mature cystic teratomas of the ovary are composed of endoderm and ectoderm, but not mesoderm
All the organs of our body are formed from the three layers of embryonic tissue which are the ectoderm, endoderm, and mesoderm
. We are going to see that the gut and other internal organs like the liver, pancreas, heart, lung, bladder, and kidney are made from the same embryonic tissue as the endoderm that also keeps a link with the nervous system and brain that comes from the ectoderm.
The parenchyma of the liver and pancreas is derived from the endoderm, whereas the stroma is derived from the mesoderm
. Both of them are derived from the endoderm of the foregut as the esophagus, stomach, and a part of duodenum.
Therefore, these mesenchymal-like cells give origin to the mesoderm
(dermis, muscles (smooth and striated), cartilage and bone, and other tissues)  and the endoderm (intestine epithelium and associated organs) .
The development of the ventral body wall begins by eighth day of the embryonic life with differentiation and proliferation of mesoderm
followed by its literal migration.
Embryologically, the adrenal cells have different embryological origin: the cortex is derived from the mesoderm
and the medulla from the ectoderm of the neural crest.