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B
Myelocoel
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C
Diacoel
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D
Mesocoel
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Solution
The correct option is C Diacoel The thalamencephalon region consists of the thalamus, epithalamus and the hypothalamus. Together with the hypophysis, this region makes up the diencephalon of the forebrain. The 3rd ventricle also called the diacoel is present between the right and left halves at the midline above the thalamus. The 1st and 2nd ventricles are called the lateral ventricles that are located in the cerebral hemispheres and are called the paracoel. The 4th ventricle called the metacoel is located between the pons and the cerebellum.