Question

Which structure forms the roof of the third ventricle?

• A. Corpus callosum
• B. Fornix
• C. Tela choroidea
• D. Septum pellucidum

Hint:

The fornix = major output tract of the hippocampus, also forms the roof of the third ventricle.

Answer 1

The Correct Option is B

The fornix forms part of the roof of the third ventricle, lying beneath the corpus callosum. The tela choroidea forms part of the roof in the posterior region, but anatomically the fornix is the main structure forming the upper boundary.
- Corpus callosum: connects cerebral hemispheres, not part of ventricular roof
- Septum pellucidum: thin membrane between lateral ventricles
- Tela choroidea: thin vascular membrane associated with choroid plexus, but not the main roof