A) heart
B) brain
C) thyroid
D) Both [a] and [b]
Correct Answer: B
Solution :
The cavities within brains are filled with Cerebro Spinal Fluid (CSF). These cavities are named as ventricles. These are distributed as [a]\[{{\text{I}}^{\text{st}}}\] and \[\text{I}{{\text{I}}^{\text{nd}}}\]ventricle-Olfactory region and cerebrum [b] \[\text{II}{{\text{I}}^{\text{rd}}}\] ventricle-Diencephalon [c] \[\text{I}{{\text{V}}^{\text{th}}}\] ventricle-Hind brain The lateral ventricles or paracoel is another name of cavities of cerebral hemispheres and anteriorly these are separated by thin membrane called septum pellucidum. The connecting passage between diocoel, \[\text{I}{{\text{V}}^{\text{th}}}\] ventricle and optocoel is called ITER or aqueduct of Sylvius.
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