where is the sacral located on the body
Sacrum The sacrum (/ˈsækrəm/ or /ˈseɪkrəm/; plural: sacra or sacrums;[1]) in human anatomy is a large, triangular bone at the base of the spine, that forms by the fusing of sacral vertebrae S1–S5 between 18 and 30 years of age.[2]
Ventricular system The four cavities of the human brain are called ventricles.[1] The two largest are the lateral ventricles in the cerebrum; the third ventricle is in the diencephalon of the forebrain between the right and left thalamus; and the fourth ventricle is located at the back of the pons and upper half of the medulla oblongata of the hindbrain. The ventricles are concerned with the production and circulation of cerebrospinal fluid[2]