Question

Floor of the third ventricle is known as
A. Optic thalami
B. Pallium
C. Hypothalamus
D. Epithalamus

Answer 1

Hint: A total of four ventricles comprises the brain. In each hemisphere, the first and the second are present. The third ventricle is located separately, even though it has some similar functions to the other ventricles.

Complete answer: The hypothalamus is a part of the forebrain. The thalamus is positioned at the root. On the anterior surface, a cross-like structure is discovered by a hypothalamus called optic chiasma. It transfers visual signals resurrected from the eyes to the cerebral hemisphere. If this portion is lost by chance, animals become blind. An infundibulum binds the pituitary body to the middle part of the hypothalamus. The hypothalamus regulates appetite, thirst, exhaustion, sleep, body temperature sweating and emotions centres. The third ventricle floor is known as the hypothalamus.
i. Optical thalami: This section of the brain, known as the optic thalamus, was later identified as a large mass of grey matter involving visual stimuli and all sensory modalities, with the exception of smell, were processed.
ii. Pallium: It refers to the layers of grey and white matter covering the vertebrate upper surface of the cerebrum.
iii. Epithalamus: Diencephalon encloses the third ventricle, a slit-like cavity. The thin roof of this cavity is referred to as the epithalamus, the thick sides of the right and left as the thalamus and the epithalamus as the surface. Nervous tissue does not form an epithalamus. It consists only of pia mater.
Hence, the correct answer is option C.

Note: In each of the brain's ventricles, the teal choroidea is present and adheres to the ependyma and is where the choroid plexus is developed. There is a rare third ventricle tumour known as chordoid glioma. All ventricles arise from the neural tube canal. Ventricles filled with cerebrospinal fluid (CSF) are classified as cavities of the brain. CSF formation occurs by plasma secretion.