The stereotaxic configuration of hypothalamus nerve centers in the cow

The purpose of this work was to state the three-dimensional position of the nerve centres of the hypothalamus of the cow. Studies were made on 12 brains of Frisian cattle cows weighing from 320 to 350 kg. The whole length of examined animals' skulls was on an average 51 cm. The following stereotaxic zero planes were taken: 1. a horizontal plane joining an interaurical line and upper edges of eye-sockets, 2. frontal plane runs across an interaurical line perpendicularly to a horizontal plane 3. a sagittal plane is a plane of brain symmetry. The brains were fixed with neutralized formalin, dehydrated in ethyl alcohol, embedded in paraffin and cut into section 15 micrometer thick in 3 planes. The sections were stained by Klüver's and Barrera's method. Basing on microscopic examination of these histological preparations the three-dimensional position of hypothalamus nerve centres of a cow in relation to taken stereotaxic zero planes was stated.