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.
1 How often you should cut your hair depends on how healthy it is and how fast you want it to grow; it is totally up to your own judgement.  Normal hair grows anywhere from 1â2 inch (1.3 cm) - 5â8 inch (1.6 cm) per month.