Integumentary system 
Muscular System 
Skeletal System 
Reproductive System 
Cardiovascular system 
Embedded system 
Genetics 
Endocrine system 
Respiratory system 
Urinary system 
জীবদেহের গঠন 
কোশের আকৃতি 
মানুষের দেহের কোশের আকৃতি 
বিভিন্ন শারীরবৃত্তীয় কাজ 
উদ্ভিদদেহে ও প্রাণীদেহে কোশের কাজের বিশেষত্ব ও কলার প্রকারভেদ 
প্রাণীকোশের গঠন - A Telencephalon, diencephalon and myelencephalon
- B Telencephalon, diencephalon and metencephalon
- C Cerebral cortex, limbic system and basal ganglia
- D Forebrain, midbrain and hindbrain
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During the fourth week after conception, the neural tube develops into three primary vesicles: the prosencephalon, mesencephalon, and rhombencephalon. These primary vesicles will further divide and develop into different structures of the brain.
The prosencephalon will divide into the telencephalon and diencephalon, while the rhombencephalon will divide into the myelencephalon and metencephalon. The mesencephalon will not further divide, but will develop into the midbrain.
Option D is the correct answer because it accurately describes the three primary vesicles that develop in the neural tube during the fourth week after conception. The prosencephalon will eventually develop into the forebrain, the mesencephalon will become the midbrain, and the rhombencephalon will become the hindbrain.
Option A is incorrect because the myelencephalon and metencephalon are part of the rhombencephalon, which is one of the primary vesicles that develop from the neural tube. The telencephalon and diencephalon are part of the prosencephalon.
Option B is incorrect because the metencephalon is part of the rhombencephalon, not the prosencephalon.
Option C is incorrect because the cerebral cortex, limbic system and basal ganglia are structures that develop from the telencephalon, which is one of the secondary vesicles that form from the prosencephalon.
In conclusion, the correct answer is option D, which accurately describes the three primary vesicles that develop in the neural tube during the fourth week after conception. These vesicles will eventually develop into different structures of the forebrain, midbrain and hindbrain.
Nervous System
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