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|Hind-brain of a human embryo of three months—viewed from behind and partly from left side.|
|Gray's||subject #187 797|
The obex (from the Latin for barrier) is the point in the human brain at which the fourth ventricle narrows to become the central canal of the spinal cord. The obex occurs in the caudal medulla.The decussating of sensory fibers happens at this point.
Brain: rhombencephalon (hindbrain)
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