Organs are formed of normal homours just as homours derived from in the form of primary elements which are being utilized as building material for growth and repair of organs and to yield energy for work. As per Unani the organs of two types.

1. Simple organs (Aza Mufrida): The simple organs which correspond to tissues made of specialized cells of a uniform nature. Hence the simple organs are those in which the visible and perceptible parts carry the same name of function as the whole organ example muscle, nerve and bone etc. These organs are called Homogenous organs as their tissue particle are of similar type.

2. Compound organs: The compound organs are those of which the comprising parts irrespective of size and shape differ in another as well as name from the whole organ eg. Hand, foot and face etc. Therefore a part of the face cannot be called the face and a part of hand cannot be called as hand. These organs through which all movements and functions of the cell are being carried out.