THE SKELETON 



181 



across the joint from bone to bone. But a mass of muscle 

 around a joint would impede motion. The tendon of a muscle 

 is not nearly so thick as the muscle, consequently where free- 

 dom of motion is important, the muscle is frequently connected 



FIG. 95. Bone, in cross section. In A the surface of the bone is uppermost; 

 B, an Haversian system more highly magnified, h, Haversian canal; I, lacuna 

 the lacunae connected by canaliculi; a, artery; v, vein; la, bony lamella. (From 

 Galloway.) 



at a distant point and only the tendon crosses the joint. Note, 

 for example, that the muscles of the fingers are located in the fore- 

 arm, and the tendons can be traced across the wrist and knuckle 

 joints. The proximal point of attachment of a muscle is its 



FIG. 96. Connective tissue, showing fibrous structure and a few scattering cells. 



"origin," 



the distal point of attachment the " insertion." 

 The middle, thicker portion of a typical muscle (like the 

 biceps) is the " belly." The muscle is composed of muscle 

 fibres, arranged in bundles. The fibers of each bundle are 



