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Updated: May 13, 2025
Nature thus set up a double joint for the movements of the head, one between the atlas and axis for rotatory movements, another between the atlas and skull for nodding and side-to-side movements. And all these she increased by giving flexibility to the whole length of the neck. Makers of modern telescopes have imitated the method Nature invented when fixing the human head to the spine.
Since Dorothy Chase came back last fall she gives a side-to-side jerk that stops your breath short just where it happens to be at the moment. What do you suppose they'll be like? Young ladies from two years' residence in Germany, or just plain, jolly girls?"
I timed the average period occupied in one up-and-down vibration, but do not now remember the figures. The second motion was a side-to-side roll, and could be calculated by watching the port rail and contrasting it with the horizon as before.
In moving to gain this natural equilibrium we allow our muscles to carry us forward, and when they have contracted as far as is possible for one set, the antagonizing muscles carry us back. So it is with the side-to-side poising from the ankles, and the circular motion, which is a natural swinging of the muscles to find their centre of equilibrium, having once been started out of it.
Finding himself again blocking her path, "Hurry!" he urged, and dodged the other way. She also dodged that way. Thus they did a kind of frightened side-to-side dance there in the middle of the kitchen floor as the door opened and Barber appeared, his coat on his arm.
These are only some of the devices which Nature had to contrive in order to secure a safe passageway for the brain stem. But in obtaining safety for the brain stem, the movements of the head on the atlas had to be limited to mere nodding or side-to-side bending.
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