In fifth chapter of Sharirsthan Susrut described various parts of the body. Not only various parts of the body, but also number of these parts or organs, is nicely given in this Sharir Sankhya Vyakarana Sharir Adhyaya. Anaga, Pratnyaga, Twacha, Kala, Sira, Snayu, Dhamani are described with its numbers & distribution of them. Sivani is the one of structure present in the body. There is Sapta-Sevani present in the body. Structure of Sevani & also importance of it is given by Ayurveda. Sevani word gives two references. First is a Sapt Shivayna available for the Sevani & second in case of Sandhi Sharir. There is confusion regarding various terms as Sevani or Simant. With the help of this article, I am trying to clarify these concepts with the help of modern science.