Internal rotation happens after flexion of the fetal head during labor. The fetus will turn its head either to look straight up or down.
is head up and down,arm rotation etc.
Rotation of the head occurs between the atlas and the axis bones. These are the first two cervical vertebrae.
rotation
Its the :- head spin or windmill...
rotation
rotation
Rotation.
One full turn of the adjusting wheel on a dividing head is equal to 9 degrees. 40 Turns are equal to 360 degrees which is one full rotation of the head.
It should UNtighten counter from the rotation of the head. If head rotates right then unscrew left.
You're a clunk-head...
semicircular canals