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.
There are three stages of hair development: anagen, the active growing stage; catagen, a short interlude between the growth and resting phases; and telogen, the resting (club) stage before shedding. Scalp hair grows at an average rate of 1 mm every 3 days, body and eyebrow hair at a much slower rate.