After conception, the head end of the neural tube shows 3 divisions. Here is the schematic diagram of it. 

Miami University of Ohio

The nervous system begins developing soon after conception. After a few weeks, the head end of the neural tube has three main divisions
- Forebrain
- Mesencephalon (midbrain)
- Hindbrain 

Brain subdivisions

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

The forebrain is the largest part of the brain and contains the two hemispheres of the cerebral cortex. Situated beneath the cerebral cortex are the subcortical structures of the forebrain, which include the thalamus, hypothalamus, the pituitary gland, and the limbic system.

Forebrain

Schematic Arrangement of Subdivision of Brain 

The hindbrain houses the structures of the brainstem, which include the medulla, pons, and midbrain. These components govern automatic physiological functions such as blood pressure and breathing. Additionally, the hindbrain contains the cerebellum, a structure responsible for coordinating movement and assisting with specific types of memories.

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