Rear of brain and spinal cord. Coloured sagittal magnetic resonance imaging (MRI) scan through the structures at the rear of a normal human brain, and the cervical part of the spinal cord. The structures shown here include the cerebellum (centre right), pons, brainstem and medulla oblongata (centre), and the start of the spinal cord (lower left). The medulla oblongata passes through a hole called the foramen magnum. The blue areas are the cerebrospinal fluid (CSF) spaces.
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