00:01
So in this question, you want to sort out all these statements or the movement into three different categories, rotation, excursion, and circumduction.
00:10
So let's look at each of the categories first.
00:13
First category, we're talking about rotation, so making a circular motion.
00:20
So let's write down all the possible movement and sort out belong to rotation.
00:32
So point a finger in the air and turn it around at its base.
00:38
This is called rotation.
01:21
Because rotation basically is the movement of a body part around its axis.
01:27
So this is why this is one of the statements or the movement belongs to rotation.
01:41
Another movement that belongs to rotation is turn the head from side to side.
01:47
This is again a movement around the axis.
02:02
The key word here is the movement around the axis.
02:07
The second concept is excursion.
02:18
A excursion is a side to side movement, basically i would say go back and forth.
02:37
So if we look at all the statement moving with molars from side to side to crush a peanut, this will belong to excursion because the key word is that the molar from side to side as a side movement to crush a peanut.
03:16
The last category is the circumduction.
03:27
The circumduction is a, let's say, the description of it is one side of body part is fixed, so the other part actually is having a circular motion without rotating the torso.
04:12
So this is the the definition of circumduction.
04:15
So then let's take a look at all the movement that belongs to that category.
04:19
So let's say you move a rigid straight leg and foot to draw a circle in an ascent with one's toe...