Fig. 4. Anatomy of the region where the cranial nerves extend from the brain. (A) Horizontal section, stained according to Kluver-Barrera. The orange line surrounds the region of activation. (B) Drawing of the section shown in A delineating the sensory root of the trigeminal nerve (Vs) and other areas and nerves. The V is located rostrally to the facial nerve (VIIs) and the anterior lateral line nerve (alln). It projects to the trigeminal motor nucleus (NVmd) that innervates the muscles of the jaws. (C) Transverse section in the region of the sensory and motor nuclei associated with the trigeminal nerve. (D) Drawing of the section shown in C, delineating the location of the primary sensory trigeminal nucleus (NVs) dorsally to the trigeminal motor nuclei (NVmd and NVmv), and ventrally to the commissure of the secondary gustatory nuclei (cgus). The NVs receives input from the trigeminal nerve and projects to the valvula cerebelli. For other abbreviations, see List of abbreviations. Scale bar, 0.3 mm (A,B) and 0.2 mm (C,D).