An implanted port is a central line that does not have an external connector protruding from the skin for administration of medication. Instead, a port consists of a small reservoir covered with silicone rubber which is implanted under the skin, which then covers the reservoir. Medication is administered by injecting medication through the skin and the silicone port cover into the reservoir. When the needle is withdrawn, the reservoir cover reseals itself. A port cover is designed to function for hundreds of needle sticks during its lifetime. Ports may be placed in an arm or in the chest area.