Anatomy: Medulla Oblongata and Cerebellum

The cerebral cortex contains 90% of the cell bodies in the nervous system.

The white matter beneath the cortex is composed of unmyelinated nerve fibers.

The frontal lobe is separated from the parietal and temporal lobes by the occipital lobe.

The vertebral arteries branch to form the anterior and middle cerebral arteries.

The basilar artery joins the blood supply from the internal carotids in a venous ring at the base of the brain.

The circle of Willis makes no contribution to ensuring blood supply to the brain in case of arterial occlusion.

The cerebral cortex is primarily composed of white matter.

The parietal lobe lies beneath the white matter of the cerebrum.

The internal carotid arteries do not play a role in supplying blood to the brain.

The posterior communicating artery forms an important part of the circle of Willis.