#hemal_arch__hemalarch__haemal_arch  a structure arising ventrally from a vertebral centrum and enclosing the caudal blood vessels
  supertype:  arch.skeletal_structure  a curved bony structure supporting or enclosing organs (especially arches of the feet)
  part of:  centrum  the main body of a vertebra
     part of:  vertebra  one of the bony segments of the spinal column
        part of:  spinal_column__vertebral_column__vertebralcolumn__spine__backbone__back__rachis  the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back"
           part of:  axial_skeleton__axialskeleton  the part of the skeleton that includes the skull and spinal column and sternum and ribs
              part of:  endoskeleton  the internal skeleton; bony and cartilaginous structure (especially of vertebrates)

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