Accessory muscles are isointense to skeletal muscle on all pulse sequences and typically attach by muscular or tendinous insertions. Accessory muscles around the knee include the 3 rd head of the gastrocnemius, the accessory plantaris, the accessory popliteus, and the tensor fasciae suralis muscle.
Napster was founded by Shawn Fanning, John Fanning, and Sean Parker. Initially, Napster was envisioned as an independent peer-to-peer file sharing service by Shawn Fanning. The service operated between June 1999 and July 2001.
Although there were already networks that facilitated the distribution of files across the Internet, such as IRC, Hotline, and Usenet, Napster specialized in MP3 files of music and a user-friendly interface. At its peak the Napster service had about 80 million registered users.