At that time, Shri Ramkrishna Paramhans had explained the meaning of 'Sai' in his pravachan, In the opinion of power, the one who has acquired the world i.e. a Siddha Purush is said to be Koul, according to Vedant, it is Paramhans, so according to Boul Vaishnav (a sub custom of Bengal) it is called Sai.
The tibialis anterior muscle is the largest muscle located in the anterior (front) compartment of the leg. The blood supply to the tibialis anterior muscle comes primarily from the anterior tibial artery and its branches.
The two major muscle groups of the upper leg are the hamstrings and the quadriceps. The hamstring muscle group is in the back of the thigh. The quadriceps muscle group is the large bulk of muscle at the front of the thigh. The hamstrings are made up of three individual muscles, while the quadriceps is made up of four different muscles. These two muscle groups are antagonistic and you use them in nearly all ambulatory activities.