Ayurveda is the science of life. Shushruta was an ancient indian physician known as main author of the treatise and the father of surgery. Acharya Sushruta as the best in Sharirasthana. Sira is important anatomical structure in Ayurvedic Science. Sira is a significant entity in which Dosh Dhatu flows from one place to another place of the body. In Ayurveda the word Sira, Dhamani and Strotas are used interchangeably. All these structures are present very closely, minute in nature and different function. The term Sira at one place reflect as blood vessel and at other place it reflect as nerve. It is one among the Marma Vastu.
Dr. Vikas Ashok Kashikar* (Fri,) studied this question.