THE SPINAL PROJECTION FROM THE GIGANTIC NEURONS IN THE RETICULAR FORMATION OF THE MIDBRAIN IN THE RABBIT——HRP AND WGA-HRP TECHNIQUES / 解剖学报

ABSTRACT

It was discovered that there were a group of gigantic neurons scattering in the tegmentum dorsolateral to the oral half of the red nucleus in the midbrain of the rabbit. The form and size of these neurons were similar to the gigantic cells in the gigantocellular reticular nucleus of the medulla oblongata. After injecting HRP or WGA-HRP in the cervical, thoracic or lumbar spinal segment of the rabbit, more than a half of these gigantic cells were labeled. The labeled cells were most crowded at the oral end level of the red nucleus. There were also labeled terminals near the labeld cells in the reticular formation of the midbrain. It is evidently that there are reciprocal connections between the spinal cord and the reticular formation of the midbrain in the rabbit.