Choose the appropriate lettered structure in this radiograph of the lateral view of the head. Cerebrospinal fluid is formed by vascular choroid plexus in which structure?: (A) A, (B) B, (C) C, (D) D
Answer is A. (a) Cerebrospinal fluid is formed by vascular choroid plexus in the ventricles in the brain; the letter "A" indicates the lateral ventricle.