ACCESS TO THE ENCEPHALIC VENTRICLES IN THE DOG - A NEW TECHNIQUE

The surgical procedure described here consists in the catheterization of the ventricular recess within the olfactory bulb of the dog, Canis familiaris. Twelve dogs belonging to three breeds : Greyhound (dolicho cephalic), Pointer (mesocephalic) and Pekingese (brachycephalic) were utilized. The olfactory recess lies in the frontal region, at the leve l of the transverse plane of the zygomatic process of the frontal bone ; its surgical access is perpendicular to the surface of the stop, 5-7 mm (Pointer and Pekingese) to 13-15 mm (Greyhound) rostral to this pl ane, and 2+/-1 mm from the median plane. The outer and inner plates of the frontal bone have to be trephined (2 mm and 1 mm diameter, respec tively) in order to access the olfactory bulb. Free flowing cerebrospi nal fluid (CSF) indicates that the tip of the needle is correctly situ ated within the olfactory recess of the lateral ventricle. This techni que may be used for sampling CSF, for intracerebroventricular administ ration of substances in physiological, pharmacological and diagnostic procedures in the dog.