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The elbow joint is a ginglymus, which is just another name for a hinge-joint. Three bones form the elbow joint: the humerus of the upper arm, and the paired radius and ulna bones of the forearm.
The 'elbow' describes the region surrounding the elbow-joint.
The bony bit at the very tip of the elbow is the upper end of the forearm ulna bone (if your arms are hanging downwards!) and is called the olecranon. This end area of the ulna, when your arm is bent, sticks out a bit, and it is also known as the 'funny bone'. When you knock it on something it really hurts! That's not really very funny at all, is it?.
However, it is not the bone that you are actually hitting, it is the ulnar nerve, which runs along that part of the body. It is the largest unprotected nerve in the human body. It is being hit against the bone underneath and this causes a short sharp pain.
The term elbow is in common use. If you visited a doctor and used the word elbow, he would probably know to which part of your body you were referring!
weenis
long Radius elbow - elbow curviture =1.5 R of pipe.
Short Radius elbow - elbow curviture =1 R of pipe.
