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A Barr body is the inactivated X chromosome that is usually found in the nuclei of female somatic cells. It can also occur in males when there is an abnormality and the male is XXY instead of the normal XY, a condition known as Klinefelter's syndrome.
Axons of alpha motor neurons bifurcate in the spinal cord and innervate a special inhibitory interneuron called the Renshaw cell (Figure 2.7). This interneuron innervates and inhibits the very same motor neuron that caused it to fire. Thus, a motor neuron regulates its own activity by inhibiting itself when it fires.