Central Nervous System 3D stage 22 Movie

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<html5media height="700" width="700">File:Stage22_CNS3d.mp4</html5media>

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Reconstruction of the central nervous system of the human embryo Carnegie stage 22. Note the size and general distribution of the brain and spinal cord.

Below the animation is a more complete description of each system.

Links: MP4 version | Quicktime version | Carnegie stage 22 | Neural System Development

Central Nervous System

During Week 5, as the neural tube continues to enlarge, the prosencephalon and rhombencephalon subdivide, while the mesencephalon expands. This gives rise to five secondary brain vesicles:

From the Prosencephalon:

  • Telencephlon – forms the cerebral hemispheres
  • Diencephlon – forms the thalamus and hypothalamus

Mesencephlon (doesn’t subdivide, expands) – forms the tectum and tegmentum

From the Rhombencephlon:

  • Metencephlon – forms the pons and the cerebellum
  • Myelencephlon – forms the medulla oblongata

In each of these areas, the central canal running through the CNS enlarges and forms the ventricular system within the adult brain.

As the tube grows in diameter, it also bends due to the rapid proliferation and ventral folding of the embryo. The resulting flexures that occur in the brain are called primary brain flexures. Three flexures occur:

  • cervical flexure occurs between the brain and the spinal cord.
  • cephalic flexure pushes the mesencephalon upwards
  • pontine flexure occurs in the opposite direction from the other two; it generates the 4th ventricle

Stage22 ALL3d.jpg
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 ‎‎GIT Stage 22
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 ‎‎Stage 22 Neural
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These 3d movies were part of the UNSW Medical degree Independent Learning Project (ILP) prepared by Aashish Kumar (2006).

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Cite this page: Hill, M.A. (2024, May 26) Embryology Central Nervous System 3D stage 22 Movie. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Central_Nervous_System_3D_stage_22_Movie

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G