Archive | Endodermal Organs

Archenteron & Alimentary Canal in Vertebrates | Endodermal Organs | Embryology

The relation between the archenteron and the definitive alimentary canal is very different in vertebrates with complete cleavage from that in vertebrates with incomplete (meroblastic) cleavage. The Relation in Lower Vertebrates: The archenteron in Amphioxus is originally lined with presumptive endoderm, presumptive mesoderm, and presumptive notochordal cells. When the notochord and the mesoderm are segregated from the endoderm, the latter [...]

By |2018-04-30T10:44:12+00:00April 30, 2018|Endodermal Organs|Comments Off on Archenteron & Alimentary Canal in Vertebrates | Endodermal Organs | Embryology
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Development of Mouth in Vertebrates | Endodermal Organs |Embryology

In all vertebrates, the mouth opening appears rather late in embryonic life after all the primary organ rudiments have already been formed. The mouth opening breaks through where the anterior end of the endodermal part of the alimentary canal touches the ectodermal epidermis beneath the front end of the neural tube. Here the ectodermal epidermis sinks in to form a [...]

By |2018-04-30T10:44:12+00:00April 30, 2018|Endodermal Organs|Comments Off on Development of Mouth in Vertebrates | Endodermal Organs |Embryology
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Development of Branchial Region in Vertebrates | Endodermal Organs | Embryology

The development of the branchial region in vertebrates is no less dependent on the cooperation of parts of different origin than is the mouth region. The leading part in the development of this area belongs to the endoderm. The endodermal cavity in this region, from its beginning, is distended in a transverse direction. In amphibians it is derived from the [...]

By |2018-04-30T10:44:12+00:00April 30, 2018|Endodermal Organs|Comments Off on Development of Branchial Region in Vertebrates | Endodermal Organs | Embryology
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