An Analysis of Simian Sulcus and Calcarine Fissure Morphometry

Abstract

Background: Restoration of vision for blind by use of cortical visual prosthesis (CVP) is a new path-breaking finding. The striate cortex lodges calcarine fissure and simian sulcus. Brodmann’s area 17, 18, and 19 are the visual areas. Variations are seen in symmetry and sexual dimorphism of striate cortex. Methodology: 50 hemispheres from formalin-embalmed cadavers used for 1st-year undergraduate teaching were used for observing types of calcarine fissure and simian sulcus. Results: Straight calcarine fissure, T-shaped calcarine fissure, and concave and straight vertical simian sulcus are the most common shapes found. T-shaped (17%) calcarine fissure and straight vertical (14%) simian sulci were found more in males. Conclusion: Knowledge of variations in shape, depth, and length of calcarine and simian sulcus helps in the proper development of CVP.

Keywords

• angular gyrus
• bionics
• cortical electrical stimulation
• cortical visual prosthesis
• lunate sulcus
• striate cortex