The human body is composed of about 270 bones at birth, later it decreases to about 206 bones. Bones are rich in vascular supply and receive around 10% to 20% of cardiac output. But what if all of our veins were inside the bones?
There are always pros and cons of any consequence. In this case, nothing is different. We would have both advantages and disadvantages of having blood veins inside bones. The good thing about it is that we would be physically stronger and durable. We would be able to survive a higher amount of force. Also, it would make the bones like carbon fibers.
Carbon fibers strands bond to make it stronger, which would help the bones grow in such a way that it would have an as little risk as possible. There are some negative sides as well.
We would become more vulnerable to internal bleeding. Also, there would be a little shrinkage of height in order to protect and strengthen the bones. Vascular portals through bone’s cortex would become extremely weak around big vessels.
Failures can also occur in the femur and without orthopedics, it would be fatal. Also, there would be problems while kinking blood vessels at the knee, elbow, and hip. The shoulder joint could get 3 axes greater than 180-degree mobility for apes, our ancestors.
So considering the negative traits, it’s actually not a good idea to have the vessels inside the bones. Now think about this incident. You, somehow, had an accident that has caused great injuries including a burst of the blood vessels.
If the blood vessels are near the surface as it is now, it would be easier to fix it by performing a minor surgery. But if your blood vessels were inside the bones then it would make the surgery more difficult.