page_title: Obex
hierarchical_section_title: Obex
context_page_description: The obex 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 decussation of sensory fibers happens at this point.
context_section_description: 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 decussation of sensory fibers happens at this point.
caption: Rhomboid fossa.
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