Into The Muscle; Within The Muscle
Because there is more pressure on the artery wall (from the heart) than that of the vein.
Muscle strength depends on the thickness of the fibers and the number of fibers contract at one time. And in order to compensate for the added work load,myofibrils are added in in order to increase the thickness of the fibers (more myofibrils,more thickness), hence a stronger muscle.
The coccygeal vein on a cow runs from the tailhead or the base of the tail through the tail. It can be accessed by needle in order to draw blood right above the tailhead, or underneath the tail.
superior mesenteric
Pulmonary Vein
The muscularis layer of arteries has a thicker layer of smooth muscle.
Interstitial
There are a number of structures that help with the one way flow of blood through the veins. These include valves in the vein lumen, and the assistance of surrounding skeletal muscle.
Gluteus Medius (outer thigh). The thickness of it would variate.
A full thickness burn possibly.
Yes, it is. The external jugular passes over (superficially) to the sternocleidomastoid.