mouse TS23
  embryo
  cavities and their linings
  limb
  mesenchyme
  vertebral axis muscle system
  organ system
  gland
  visceral organ
  nervous system
  central nervous system
  brain
  ganglion
  nerve
  spinal cord
  conus medullaris
  filum terminale
  floorplate
  lateral wall
  meninges
  roof plate
  peripheral nervous system
  integumental system
  sensory organ
  cardiovascular system
  skeleton
  tail
  extraembryonic component