6. Auditory CNS of Dolphins
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A
B
FIGURE 6.3. (A) Cross section through a dolphin's head at the level of the ear and
auditory nerve. 3V, 3rd ventricle; A, auditory nerve; AB, auditory bulla; C, cochlea;
CC, corpus callosum; CEB, cerebellum; CVS, central venous sinus; H, cerebral hemisphere; HY, hyoid; IC, inferior colliculus; L, larynx; PAG, periaqueductal gray
containing nucleus ellipticus. (B) The dashed line shows where the section shown
in (A) was made relative to the external features of the dolphin head.