What do you call that part of the muscle that connects directly to the bone?
The tendon is the part of the muscle that connects directly to the bone.


  A tendon (or sinew) is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments and fasciae; all three are made of collagen. Ligaments join one bone to another bone; fasciae connect muscles to other muscles. Tendons and muscles work together to move bones.




The image was taken from the wikipedia link.