Over the cerebellar hemisphere, 3.5cm lateral to the external occipital protuberance, parallel to the midline of the head, 4cm long extending downward.

• 相当于小脑半球在头皮上的投影。从枕外粗隆顶端，旁开3.；5厘米，向下引平行于前后正中线的4厘米长的直线。