 Al-Fārābī gives a complete explanation of the way in which all the faculties of the soul work together. Each faculty has a ruling organ and others that are auxiliaries and subordinates (al-Fārābī VC: 174–187). He holds that the ruling organ in the human body is the heart; the brain is a secondary ruling organ subordinated to the heart; however, all the other organs and limbs are subordinated to the brain. The heart rules every faculty through subordinate organs and limbs. Thus, the ruling organ of nutrition is the heart and the subordinates are the other organs that intervene in the process of nutrition, that is, the stomach, the liver, the spleen, etc. The faculty of sensation is explained following the same model: the heart rules sensation, and its subordinates or auxiliaries are the five senses whose function is to apprehend sensibles. The imaginative faculty is located in the heart and has no auxiliaries distributed in other organs, but it controls what is provided by the five senses. According to al-Fārābī, the imaginative faculty is able to separate and connect what is provided by the five senses in different ways, sometimes attaining an image in agreement with what has been perceived, sometimes something different (al-Fārābī VC: 168–169). Concerning the rational faculty, al-Fārābī explains that it is also located in the heart and has neither auxiliaries nor subordinates, but rules the other faculties, namely, the imaginative, the sensitive, and the nutritive (al-Fārābī VC: 169–171).