Fig. 5.

Dissected brain of a cat with radiopaque contrast filled cerebral ventricles. The midsagittal dissection (Fig. 5) demonstrates smaller midbrain colliculi, outlined by multiple small arrows, when compared with rabbit in Fig. 4. Of note is the presence of much larger neocortical occipital lobe and pole (OP) when compared to the rabbit in Fig. 4. The collicular ventricle (CV) superior extensions and its continuity with the midbrain aqueduct (Aq) features better demonstrated in the lateral radiograph. The collicular ventricle (CV) is more completely visualized on the radiograph as a result of the slight obliquity of the midsagittal plane of the anatomic dissection. Additional abbreviations: 3 V, 3^d ventricle; 4 V, 4^th ventricle. The distance between 2 black lines on the ruler in the specimen photograph is 1 mm