All of the following are present beneath floor of 4th ventricle except: (A) Hypoglossal nucleus, (B) Facial nucleus, (C) Abducens nucleus, (D) Facial nerve
Answer is B. Facial colliculus, a swelling in floor of 4th ventricle is formed by facial nerve looping around abducens nucleus. So facial nucleus doesn’t form the floor of 4th ventricle.