Keep going You made a fantastic channel on youtube I am a pharmacy student and we are studying anatomy in the college So we need your lectures Thank you
when something is moveable, but does not rotate across any planes, we usually call it non axial, as it is not rotating on any axis. its like sliding 2 blocks of wood on top of eachother, movement occurs, but the rotational relationship of the two always remains the same. Always defer to your individual lecturers preference though, as they will be the ones marking your exams!, hope the video helped :)
