Difference Between Sulcus and Fissure | Sulcus vs Fissure

The key difference between sulcus and fissure is that sulcus is a groove on the cerebral cortex that surrounds a gyrus while fissure is a deeper sulcus that separates the brain into functional lobes.

The brain is one of the two major components of our central nervous system. It works as the center of the nervous system in all vertebrate and most invertebrate animals. The cerebral cortex is the outer layer of neural tissue of the cerebrum of the brain. It is made up of grey matter. Sulcus and fissure are two types of grooves present on the cerebral cortex. They aid in the compact packing of the brain into the skull. Both sulcus and fissure contain several common features. However, this article focuses on the difference between sulcus and fissure.


1. Overview and Key Difference
2. What is Sulcus 
3. What is Fissure
4. Similarities Between Population Sulcus and Fissure
5. Side by Side Comparison – Sulcus vs Fissure in Tabular Form
6. Summary

What is Sulcus?

A sulcus is a groove present on the brain surface. Moreover, the convoluted nature of the brain is due to the presence of sulci (plural). They increase the surface area of the brain. Sulci are important to pack the large cerebral cortex inside the skull. These grooves are not as deep as a fissure. Sulci appear after 05 months of embryonic development. They become fully developed after 12 months of birth. Furthermore, sulci are made up of grey matter.