Assuming you mean the part of the eye responsible for seeing color... There are two types of photoreceptors in the retina: rods and cones. The cones are responsible for seeing color. (The easy way to remember it is cones and color start with c.).
The vagus nerve runs throughout the body and is responsible for the function and regulation of several bodily systems such as the heart and digestive tracts. The vagus nerve is one of the largest nerve systems in the body.The name vagus is Latin for wandering, which describes the long and complicated path this nerve takes through the body and all of the different systems it comes in contact with.he vagus nerve is one of the largest nerve systems in the body. The name vagus is Latin for wandering, which describes the long and complicated path this nerve takes through the body and all of the different systems it comes in contact with.
Some of the main functions of the Vagus Nerve include, 1  Breathing. 2  Speech. 3  Sweating. Helping in keeping the larynx open during breathing.  Monitoring and regulating the 1  heartbeat. Informing the brain of the food that is ingested and food that has been digested.  The Vagus Nerve performs the major function of emptying the gastric region of food.