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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 cochlear duct develops from the ventral otic vesicle (otocyst). [3] It grows slightly flattened between the middle and outside of the body. [3] This development may be regulated by the genes EYA1, SIX1, GATA3, and TBX1. [3] The organ of Corti develops inside the cochlear duct. [4]
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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 ...
The spinal cord is the main pathway for information connecting the brain and peripheral nervous system.The length of the spinal cord is much shorter than the length of the bony spinal column.
These brain vesicles further divide into subregions. The prosencephalon gives rise to the telencephalon and diencephalon, and the rhombencephalon generates the metencephalon and myelencephalon. The hindbrain, which is the evolutionarily most ancient part of the chordate brain, also divides into different segments called rhombomeres.