mouse TS23
  embryo
  cavities and their linings
  limb
  mesenchyme
  vertebral axis muscle system
  organ system
  gland
  visceral organ
  nervous system
  central nervous system
  brain
  forebrain
  hindbrain
  4th ventricle
  medulla oblongata
  meninges
  metencephalon
  floorplate
  lateral wall
  alar plate
  cerebellum
  rest of alar plate
  basal plate
  sulcus limitans
  roof
  midbrain
  ganglion
  nerve
  spinal cord
  peripheral nervous system
  integumental system
  sensory organ
  cardiovascular system
  skeleton
  tail
  extraembryonic component