A-섬유, or A-fibers, are a type of nerve fiber found in the human body. They are characterized by their large diameter and fast conduction speed, which allows them to transmit signals quickly. A-fibers are primarily responsible for carrying sensory information, such as touch and proprioception, from the skin and muscles to the central nervous system. These fibers are classified into different subtypes, including Aα, Aβ, Aγ, and Aδ. Each subtype has specific functions, with Aα fibers being involved in motor control and Aβ fibers transmitting touch sensations. The efficient functioning of A-섬유 is crucial for the body's ability to respond to stimuli and maintain coordination.