ihearthisto:Baby Tooth A tooth developing withing the mandible of an embryo. This tooth will eventua
ihearthisto:Baby Tooth A tooth developing withing the mandible of an embryo. This tooth will eventually erupt when its owner is 6 months of age. Look! She’s waving!i♡histoTooth development is an amazing feat of embryological engineering. Your baby teeth start to develop when the embryo reaches 44 days old. They begin as a down-growth of the epithelial cells (the dental lamina) that line the inside of your embryonic mouth, with each lamina set to become its own baby tooth. As the dental lamina grows it forms a ‘bud’ shaped structure surrounded by mesenchymal (mesoderm derived) cells that form the dental follicle.As the epithelial bud grows it enters the ‘cap’ stage where it becomes more bean shaped and is referred to as the enamal organ. The mesenchymal cells below the belly button of the bean shaped enamel organ condense to form the dental papilla. The whole developing structure is still surrounded by the dental follicle.As the tooth grows further it begins to take the shape of a ‘bell‘. The baby tooth shown here is a bell stage tooth. The enamel organ (pale hair) surrounds the dental papilla (face) and looks like it its molding the papilla into the shape of the future pointy tooth crown. The dental follicle still surrounds these growing structures.These 3 structures (enamel organ, papilla and follicle) are all that is needed to grow a normal tooth:Cells of the enamel organ differentiate to form ameloblasts that will secrete enamel.Cells of the dental papilla form the dental pulp and, around its periphery, they differentiate into special odontoblasts that will secrete dentin all around the pulp chamber.Cells of the dental follicle form the structures of the periodontium (tissues that surround the tooth root and anchor it to the surrounding bone) by differentiating into cementoblasts that secrete cementum and fibroblasts that form the periodontal ligament.This entire event is co-ordinated by a series of events known as inductive interaction - where the development and secretions of one cell type are required to trigger the differentiation and secretion of another cell type until all the tissues are secreted in the appropriate locations. -- source link
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