The golgi complex is a key organelle in the secretory pathway of the cell. It receives proteins from the ER (endoplasmic reticulum) and processes and sorts them for further transport to lysosomes, the plasma membrane, or back to the ER.
The golgi complex is composed of flattened stacks of membranes (cisternae) organized into four functionally distinct areas: the cis-Golgi network, the medial cisternae, the trans cisternae, and the trans-Golgi network. Each region of the golgi complex performs distinct processing and sorting events as proteins enter at the cis face and exit from the concave trans face. The golgi complex also prepares other macromolecules such as lipids and carbohydrates for secretion from the cell or for use by other organelles within the cell.