From a side view, the cervical (neck) region of the spine (C1 C7) is bent inward, the thoracic (upper back) region (T1 T12) bends outward, and the lumbar (lower back) region (L1 L5) bends inward.

5 HT2C receptors are located almost exclusively in the brain, and can be found in the choroid plexus, cortex, hippocampus, cerebellum, amygdala, thalamus, and hypothalamus.

Traced upward, it splits to enclose the subclavius, and its two layers are attached to the clavicle, one in front of and the other behind the muscle the latter layer fuses with the deep cervical fascia and with the sheath of the axillary vessels.

But if you remove the arm, you simply anesthetize my arm, so you put an injection into my arm, anesthetize the brachial plexus, so the arm is numb, and there is no sensations coming in, if I now watch you being touched, I literally feel it in my hand.

Mutational processes are far more complex than was thought a few decades ago with strand slippage, duplication, transposition, and illegitimate recombination producing qualitative differences between closely related genomes.