Falx cerebri
All three meninges of the cortex (dura mater, arachnoid mater, pia mater) fold and descend deep … See more

Essentially, the fissure's purpose is to separate the brain into two hemispheres, left and right. Through case studies of brain damage or stroke to either side of each hemisphere, there is evidence that the left side of the brain controls the right side of the body, … See more

• Lateralization of brain function See more

• Anatomy image: nerv/brainsup2 at Human Anatomy Lecture (Biology 129), Pennsylvania State University
• Diagram at nih.gov See more

Phylogenetically
It is thought that a majority of existing animals, including Homo sapiens, have evolved from a common wormlike ancestor that lived around 600 million years ago, called the urbilaterian. A bilaterian animal is one that has … See more

The longitudinal fissure plays a key role in corpus callosotomy, neurosurgery resulting in split brain, as it provides unobstructed access … See more

As the corpus callosum is substantially smaller in surface area relative to the longitudinal fissure (Figure 3), fiber bundles passing through are densely packed together, and precision tracking is essential to distinguish between the individual bundles … See more