Point 47 (UB-36) :
This point lies at the centre of the crease (skin-fold)
beneath the buttock.

Point 48 (U B-40) :
This point lies at the centre of the crease at the back of the
knee-joint.

Point 49 (UB-57) :
The calf muscle has two parts separated by a shallow
groove (seen as an inverted V). ‘
Point 49 lies at the apex of this groove.