About the hypoglossal nucleus, which of the following descriptions are correct ?（ ）
A.It situates in the pons. B.It is deep to the hypoglossal triangle (舌下神经三角). C.It is controlled by the bilateral corticospinal tracts. D.It is one of the somatic motor nuclei. E.It gives fibers to form the hypoglossal nerve.正确答案BDE
