Fig. 13.1. Coronal section at the level of the sphenoidal sinus, pterygoid process, posterior choanae, and infratemporal fossa, anterior view.Fig. 13.2. Coronal section, anterior view.The right pterygoid process has been removed. Fig. 13.3. Coronal section, anterior view.The right auditory tube has been retracted laterally. Fig. 13.4. Coronal section, anterior view.The auditory tubes have been retracted laterally to expose the clivus, and atlanto-occipital joints. Fig. 13.5. Coronal section, anterior view.The inferior third of the clivus has been drilled and the dura mater opened to expose the jugular foramina, the hypoglossal canals, vertebral arteries, and medulla. The posterior wall of the sphenoidal sinus has been removed to expose the pituitary gland and internal carotid arteries covered by dura mater. Fig. 13.6. Coronal section, anterior view.The clivus and dura mater have been removed to expose the brainstem. The auditory tubes and cervical portion of the internal carotid arteries have been retracted laterally.
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