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Thereafter, the otic cup closes off, creating the otic vesicle. Once formed, the otic vesicle will reside next to the neural tube medially, and on the lateral side will be paraxial mesoderm. Neural crest cells will migrate rostral and caudal to the placode. The general sequence in formation of the otic vesicle is relatively conserved across ...
The first part of the ear to develop is the inner ear, [19] which begins to form from the ectoderm around the embryo's 22nd day, [18] derived from two thickenings called otic placodes on either side of the head. Each otic placode recedes below the ectoderm, forms an otic pit and then an otic vesicle. [20]
The otic placode forms the otic pit and the otic vesicle, giving rise eventually to organs of hearing and equilibrium. The epibranchial or epipharyngeal placodes generate the distal portion of the ganglia of cranial nerves VII, IX and X: [3]
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The optic vesicle will then induce the ectoderm that thickens (lens placode) and further invaginates to a point that detaches from the ectoderm and forms a neurogenic placode by itself. The lens placode is affected by the chordamesoderm making it invaginate and forms the optic cup composed by an inner layer of the neural retina and outer layer ...
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During the stage of neural plate formation the embryo consists of three cell layers: the ectoderm that eventually forms the skin and neural tissues, the mesoderm that forms muscle and bone, and the endoderm that will form the cells lining the digestive and respiratory tracts.