Be careful. If you fall down on your back it could be crippling!
Old wives tale. First of all, nobody's talking about carrying right on the spine at 6 o'clock. Beside making your gun rather inaccessible at that location, it's downright uncomfortable to carry there. I learned that the hard way, and I learned it very quickly. But for the sake of argument, and based on general principle alone, you can severely injure yourself by falling on a holstered gun at almost any position on the body. Try carrying at 3 o'clock, falling on your gun and see how your hip feels. The small of the back area you're speaking of, again based on general principle because we aren't talking about carrying there, starts in the lower lumbar area at about L3, descends down to L5, and possibly extends down to the sacrum if you have a really long barreled gun. The nerves in the lower lumbar and sacral sections of your spinal cord don't come out of the spine in major branches like in the upper portions of the spine. They're more like bunches of tiny wires than large cables, so it's much harder to cause severe and permanent damage to them. Also, the damage caused by severing one is severely limited because each of the little wires controls a relatively limited portion of your body, much more limited in comparison to those you can damage in the higher levels of the spine where people are often paralyzed by major injuries. If you theoretically managed to completely sever your spine at L3, you'd see at worst paralysis from about the knee down.
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But the odds of actually severing your spine at L3 by falling on your gun are pretty much impossible, so we'd have to consider only injuries on a lesser scale, and what effect such injuries would cause. But let's take the discussion a bit further for the sake of argument and general principle again, just for the fun of it. What if you fell on the gun you were carrying over your spine and it didn't sever your spine, but it did injure it from the impact force. Let's take a look. If there was injury to the spinal cord itself, it would likely be to a posterior or dorsal (rear) horn.
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Posterior and dorsal horns transmit superficial sensations (touch, heat, etc.), deep sensations (pressure, vibrations, balance, etc.), and visceral sensibility. The anterior or ventral (front) horns transmit voluntary motor impulses to the striated muscles and autonomic impulses to the non-striated muscles. In effect, this means if you severed nerves from a posterior/dorsal horn, you'd lose feeling in the affected area, but you'd still be able to move as you did before the injury and bodily functions would be preserved. I mention bodily functions because the nerves in that area of the spine control your lower digestive functions and sexual organs. Also, you'd have to damage both sides to affect both legs. Either way you wouldn't be crippled, though I don't think anyone would consider that having a good day.
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But since we aren't talking about carrying your gun directly over your spine, none of this really matters anyway, does it?
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Yeah, I know I got carried away. Sorry. I'm still stuck in my house all day every day and it's sometimes fun to find new topics to divert me away from the usual tedium of the day. If you aren't familiar with me, I'm stuck here because I broke my back last year. L4 to be exact. No, I'm not crippled. And no, I didn't fall on my gun.