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Central:
In anatomy and medicine (as elsewhere), central is the opposite of peripheral which means away from the center. The word peripheral comes from the Greek peripheria (peri-, around or about + pherein, to bear, carry).
A rel=dict central line is an infusion tube that is located in or near the heart (centrally in the rel=dict circulatory system). A Swan-Ganz cather with its tip, for example, in the rel=dict right atrium and ventricle of the heart is a central line. On the other hand, a peripheral line is located on the periphery of the circulatory system. An ordinary IV (intravenous) catheter is a peripheral line.
The human nervous system consists of the rel=dict central nervous system (CNS) and the rel=dict peripheral nervous system ( rel=dict PNS). The brain and spinal cord make up the CNS. The PNS contains the nerves outside the CNS.