Access to the encephalic ventricles in the Friesian cow: a new surgical approach.

The surgical procedure described in this communication consists in the catheterisation of the ventricular recess within the olfactory bulb. It lies 28 +/- 5 mm under the frontal skin, in a retro-orbital position, and 15 +/- 2 mm from the median plane. Its access is easy in experimental conditions.