The document provides information about needles and syringes used for parenteral administration of medications and other substances. It discusses the anatomy of needles, including gauge size, point, bevel, lumen, shaft and hub. It also covers penetration points like intravenous, intramuscular, subcutaneous, and intradermal. Syringe anatomy is explained as barrel, plunger and tip. Different types of syringes like hypodermic, tuberculin, insulin and prefilled are described. Safety features of modern syringes to prevent infection are also mentioned. Proper disposal of used needles is highlighted.