The telencephalon surrounds the lateral ventricles, and the thalamus surrounds the third ventricle. In this section, the lateral ventricles can be seen sprouting from the slit-like third ventricle. The hypothalamus, forming the floor of the third ventricle, is a vital control centre for many basic bodily functions. The insula lies at the base of the lateral (Sylvian) fissure, here separating the frontal lobe from the temporal lobe. The heterogeneous region lying deep within the telencephalon, medial to the insula and lateral to the thalamus, is called the basal forebrain.

1. Hypothalamus

2. Basal forebrain

3. Temporal lobe

4. Lateral (Sylvian) fissure

5. Insula

6. Frontal lobe

7. Lateral ventricle

8. Thalamus

9. Third ventricle

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Revised: June 12, 2006 .