Consist of several intertwining loops among the basal ganglia nuclei & thalamic nuclei Striatum (caudate & putamen) is receiver of input to basal ganglia Frontal cortex especially premotor area
Each strand of hair on the human body is at its own stage of development. Once the cycle is complete, it restarts and a new strand of hair begins to form. The rate or speed of hair growth is about 1.25 centimetres or 0.5 inches per month, or about 15 centimetres or 6 inches per year.
After shaving, the hair growing back may appear to be thicker and coarser, because the shaving process removes the natural thin ends of the hair. Eventually, the shaved hairs are shed and replaced with normal hair. Scalp hairs may only be shed every two to six years. Scalp hairs grow continuously most of the time. The active growth phase, called anagen, can last for up to six years. In the telogen phase, the hairs stop growing and become dormant for approximately 100 days and are then shed.