Leg Paralysis in Dogs. Also see professional content regarding limb paralysis. Paralysis of a leg often results from damage to the peripheral spinal nerves. Paralysis of a front leg is usually associated with injury to the nerve roots in the neck or shoulder, or injury to the radial, median, or ulnar nerve in the leg. Paralysis of a hind leg is usually associated with injury to the nerve roots in the lower back or tailbone, or the femoral, sciatic, peroneal, or tibial nerve in the leg. Paralysis of a leg may be temporary or permanent.
The next most abundant gas is (3) water vapor. Water vapor varies in concentration in the atmosphere both spatially and temporally. The highest concentrations of water vapor are found near the equator over the oceans and tropical rain forests.
However, water vapor can also be one of the most abundant gases! The maximum amount of water vapor air can hold is 4%, so water vapor could be number 3 or 4 on this list. On average, the amount of water vapor is 0.25% of the atmosphere, by mass (4th most abundant gas). Warm air holds more water than cool air. One a much smaller scale, near the surface forests, the amount of oxygen and carbon dioxide can vary slightly from day to night.