In a 4-year-old boy, thanks to the very good

work of his paediatrician, nanism, a small growth caused by insufficient

production of growth hormone, was detected. The boy has not grown enough, and

his face is small. The blood also shows a low level of growth hormone. The

cause may be not only pituitary disorders, but also insufficient or excessive

secretion of related liberins and statins in the hypothalamus. How do liberins

and statins get from the hypothalamus to the pituitary?