Following dural incision and elevation of the cerebellum, the lateral surface of the medulla and upper cervical spinal cord comes into view. The space anterior to the brainstem and spinal cord can be seen through a veil of cranial and spinal nerves. (Cb, cerebellum; M, medulla; CSC, cervical spinal cord; 7 and 8, facial and audiovestibular nerves; 9, glossopharyngeal nerve; 10, vagus nerve; 11c, cranial branch of the acessory nerve, 11s, spinal branch of the accessory nerve; 12, hypoglossal nerve; C, first cervical root.)
{}