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Updated: April 26, 2025
In the end of this bone we find a net-work or scaffolding, wonderfully constructed and composed of delicate spicules and lamellæ. The whole is so arranged that with the least expenditure of material the most effective action on the joint-surfaces is obtained—hence the most efficient distribution of friction and a proper freedom of movement.
The rounded heads of bones which move in them are thus more securely held in their sockets. Besides these structures, the muscles also help to maintain the joint-surfaces in proper relation. Another essential to the action of the joints is the pressure of the outside air. This may be sufficient to keep the articular surfaces in contact even after all the muscles are removed.
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