I think its the humerus.
Tendons connects the muscle to the bones. They also connect to your biceps and triceps.
The triceps and biceps are antagonistic muscle groups; the triceps straighten the arm and the biceps pull it in the opposite way. Therefore, when the triceps contract, the biceps lengthen.
"Tri" is the Latin for three. "Ceps" means head. The triceps muscle, found on the back part of the upper arm, has three "heads" or spots where it attaches to the bone. The triceps is the opposing muscle for the biceps, which has "two-heads."
The contraction of a muscle exerts a pull on a bone because muscles are attached to bones by tendons.
angle of pull is the angle between muscle insertion and the bone on which the muscle inserts
radius
No. The triceps is an upper arm muscle
skeletal muscles that are attached to ligaments that are attached to bone
Triceps muscle has got medial head, lateral head and long head. Long head has got the origin from the infraglenoid tubercle. That means, when you contract the triceps muscle, long head gets support from the scapula bone. That gives additional support for the muscle to do the the action of extension on the elbow joint.
Let's take your arm as an example. you have the bicep and the tricep. all muscles come in pairs. they can only push, not pull. your bicep connects to the top of your hinge joint in your elbow, and your triceps connect to the bottom. your bicep pulls to bend your arm, and your triceps pulls to straighten your arm. Was that a too complicated answer?
The triceps brachii is the muscle of the body primarily used to extend the elbow. It is a long muscle that originates in the scapula.
Triceps is a very powerful muscle on the backside of your arm. It has medial, lateral and long head. That is why the name triceps goes. Medial and long heads arise from the humerus bone and long bone arise from the infraglenoid tubercle of scapula bone. It is inserted on the olecranon process of the ulna bone of the forearm. It gets the nerve supply from the radial nerve, on it's way to extensor compartment of the forearm.