[Structure and topography of the nucleus intermediomedialis in the equine spinal cord]

In this paper, structure and position of the centers of the parasympathetic nervous system in the horse spinal cord were presented. Studies were carried out on 2 horse spinal cordis. After sampling, the material was dehydrated in alcohol, embedded in paraffin and cut into 15 micron thick sections. The sections were stained according to Nissl's method. Every third section was studied. Nucleus intermediomedialis in the horse spinal cord is an intermittent tract of nervous cells passing from the I cervical neuromere to the V sacral segment. The cells of this nucleus form round, horizontally--oval concentrations on the transversal sections or its cells are situated loosely in the pars intermedia of the spinal cord grey substance in a small distance from the central canal. Nucleus intermediomedialis is constructed of round, oval, spindle-shaped, small cells of average size along its whole length. This nucleus is best developed in the sacral segment, a little weaker in the cervical and lumbar parts and the weakest in the thoracic part of the spinal cord.