At the level of the lamina terminalis, the frontal lobe occupies the upper half of the section. The temporal lobes appear larger in this section, and are still inferior to the Sylvian fissure and lateral to the sphenoid sinus.

Internal structures of the brain seen at the level of the thalamus. Synonyms: Dorsal thalamus, Thalamencephalon , show more... Cross-sections are two-dimensional, axial views of gross anatomical structures seen in transverse planes.

The descending portion of the sinus is what we find in the cross-section at the thalamic level and it is found in the midline anterior to the occipital bone between the two occipital lobes. And that's it, we have quickly worked through this cross-section.

Main venous sinuses detectable as traces on the endocranial walls: marginal sinus (ms), occipital sinus (os), sigmoid sinus (ss), superior sagittal sinus (sss), transverse sinus (ts). The meeting area at the internal occipital protuberance is called confluence of sinuses.

The thalamus is chiefly supplied by small perforating end-arteries arising from the posterior cerebral artery. The thalamus has four vascular territories 1-3: anterior (or tuberothalamic): supplied by thalamotuberal (or polar) arteries which are branches of the posterior communicating artery