A light and electron microscope study of rat abducens nucleus neurons projecting to the cerebellar flocculus.
Injection of horseradish peroxidase (HRP) into the cerebellar flocculus of the rat was employed to identify neurons in the abducens nucleus that project to the flocculus. The number, ultrastructural features and precise localisation of these neurons in the nucleus were examined. They were present bilaterally and represented about 7% of the total neuronal population of each nucleus. They were localised principally in the dorsomedial area of the cranial half of each nucleus and did not display the typical ultrastructural features of motoneurons. It is concluded that the localisation and ultrastructural characteristics of these HRP-positive neurons are useful for distinguishing them from other neuronal populations within the nucleus.
Abstract : These abstracts provide a synopsis of research projects conducted by dental officers enrolled in the first, second, and third year residency programs at the National Naval Dental Center, Bethesda, Maryland, during the academic year 1977-1978. The projects were completed in partial fulfillment of the requirements of the programs. (Author)