Dendritic range of the neurons of the intermediate gray at the levels of the first and second lumbar segment of the spinal cord in the cat. 2. The range of dendrites of the paramedial region neurons.
The lumbar segments (L1 and L2) of spinal cords in 8 kittens and 6 mature cats were examined using several modifications of Golgi method. Within the paramedial region two groups of neurons were distinguished (besides the thoracic nucleus), i.e. the intermediomedial nucleus and paracommissural neuronal group. Small cells of the both groups send their dendrites in the relatively short distances over the nuclei. Medium cells dendrites of the intermediomedial nucleus penetrate the thoracic nucleus, the central region of the intermediate gray, the lamina VII, and the white commissure. Dendrites of the paracommisural cells penetrate the lateral horn as far as motor nuclei, the intermediomedial nucleus, sometimes the thoracic nucleus, the central and lateral regions of the intermediate gray as well as the white commissure. Possible afferent connections of these neurons with various centers of the cord, with supraspinal centers as well as with peripheral afferents are discussed.
D000818:Animals; D002415:Cats / Q000033:anatomy & histology*; D003712:Dendrites / Q000648:ultrastructure*; D009474:Neurons / Q000648:ultrastructure; D013116:Spinal Cord / Q000166:cytology*