At the level of the facial colliculus the sulcus limitans widens into a flattened depression, the superior fovea, and in the inferior part of the fossa appears as a distinct dimple, the inferior fovea.
2.
Below the inferior fovea, and between the trigonum hypoglossi and the lower part of the area acustica is a triangular dark field, the vagal trigone, which corresponds to the sensory nucleus of the vagus and glossopharyngeal nerves.
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