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Ectoderm

German: Ektoderm

1 Definition

The ectoderm is the outer layer of the three germinal layers during embryogenesis.The following structures originate from the ectoderm: structures of the body surface (skin, integumentary appendage), parts of the teeth (dental enamel), essential parts of the organs of perception, sensory epithelium and the central nervous system.

2 Development

The development of the ectoderm is controlled by the signal molecules chordin and noggin from the chorda dorsalis. The central and cranial located neuroectoderm, which in turn forms the neural plate, is generated within the ectoderm. The central nervous system is derived from the neural plate.

Working in an external direction, surface ectoderm is created, from which in turn epidermis and appendage differentiate. In the surface ectoderm's cranial parts epithelial thickenings occur, so-called placodes, which are involved in the creation of the sensory organs of the head and of the nerves which belong to them. The following in particular should be noted:

Specialties: Anatomy

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