Introduction
Histology is the study of detailed structure of tissues making up the different organs of plant as revealed by microscope. It is derived from the [2] Greek word   “Histo” (a Cobweb) and “logo’ (Study Of). Anatomy is the study Of Gross Internal structure of plant Organs by technique of section-cutting.”Ana” means to cut. Anatomy means to cut asunder”tomy” means to cut. Anatomy means to cut asunder the cell and tissue of the plant are usually derive from the and tissues of the plant are usually derived from the zygote +or fertilized egg through intermediate stage or develop embodied in the embryo. Meristematics region where the plant cell begin to divide actively for a long period of time become deniated (separated) at each end of the embryo by the progressive vaccuolation of the intervening cells. These Meristematics areas are the apical meristem and shoot and during growth this important regions of the plant become progressively   distract from one another as a result of their own activity. The rest of the plant being differentiated between them plants have been unique property of open growth which result from the activities of two apical meristem in which the addition of new cells continue while of other plant parts reach maturity.
        These are 2 meristem produce cells whose derivatives differentiate into root and shoots. This growth is called PRIMARY GROWTH and the organs and tissues formed constitute the primary plant body which is composed of primary tissues.
In many plants, stems roots increase in thickness by addition of vascular cambium produce the meristem called phallogen or cock cambium. The vascular cambium produce the secondary xylem and phloem while the phallogen gives rise to the periderm which is the outer covering that replaces the epidermis when ruptured as a result or pressure  by the secondary growth.
The Vascular cambium and phallogen are called lateral meristem because of their parallel to the sides.
The Three Main systems in the plant may called;
A.      DERMAL
B.      VASCULAR
C.      GROUND SYSTEMS
1.       DERMAL SYSTEM: comprises the outer recovering (epidermis during primary growth).
2.       VASCULAR SYSTEM: Consist of phloem and xylem which are the conducting element of the plants. This developed from procambium during the primary growth (Meristematics tissue of the primary tissue).
3.       GROUND SYSTEM: All other tissue different from dermal and vascular system constitute the ground system usually consists of parenchyma cells which are living with abundant protoplasm, sclerenchyma cell which are dead cells with lignified walls and collenchymas cell are living but thick walled cells.
The vascular element formed a cylinder or rod with the ground tissue peripheral and sometimes also central to them and the dermal tissue on the peripheral.
   The ground tissue between the dermal and the vascular system or component is called CORTEX and the ground tissue between the vascular cylinder is called PITH. However, in the root, there is often is often no pith. The vascular tissue in the stem, usually contain numerous separate strand s called VASCULAR-BUNDLES which may also be arranged in different forms or form a cylinder.
                The vascular system in the leaf, form a network of strands embedded in the ground tissue called MESOMORPH which consist of tightly packed cells with chloroplast