Book 8
1
From this point begins the humerus, which at both ends is swollen out, and is there soft, without marrow and cartilaginous; in the middle cylindrical, hard, contain in marrow; and slightly curved both forwards and outwards. Now its front part is that on the side of the chest, its back, that on the side of the shoulder-blades; its inner part that which faces the side, its outer away from the side. It will be clear in later chapters that this applies to all joints. Now the upper head of the humerus is more rounded than any other bone hitherto described and is inserted by a small excrescence into the top of the wide bone of the shoulder-blades, and the greater part of it is held fast by sinews outside its socket.
