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The cytoarchitecture and some efferent projections of the centromedian‐parafascicular complex in the lesser bushbaby (Galago senegalensis)

The morphology of neurons in the centromedian (CM) and parafascicular (PF) nuclei in the lesser bushbaby (Galago senegalensis) is described in coronal and horizontal brain sections using Golgi‐, horseradish peroxidase (HRP)‐, and Nissl‐staining procedures. The CM contains two types of cells referred to as principal neurons and Golgi type II (like) neurons. Cell bodies of principal neurons are relatively large in cross‐sectional area (mean = 130.42 μm2), round to spindle in shape, support short somatic spines, and give rise to three to five primary dendrites. The dendrites branch in a “radiate” pattern and possess numerous appendages consisting of narrow, stalk‐supported swellings. The presumed axons of these cells are impregnated only in their initial segments. On the basis of the similarity of principal neuron soma shapes and cross‐sectional areas with those of HRP‐reactive somata following cortical HRP implantation, it is concluded that at least some of the principal neurons in Galago CM project to somatic sensory‐motor cortex. Golgi type II (like) neurons have small (mean = 79.43 μm2), round somata which support several spines and give rise to three to four small‐diameter dendrites. The dendrites are infrequently branched, sinuous in their courses, and give rise to complex appendages and beaded processes. However, the axons of these cells could not be seen to ramify in the immediate vicinity of the dendritic field or soma, and there is considerable overlap in the cross‐sectional areas of Golgi type II (like) neurons seen in Golgi preparations and HRP‐stained cells following cortical implant of HRP pellets. Consequently, although Golgi type II (like) cells have traits characteristic of classically described intrinsic neurons, a cortical projection of these cells cannot be ruled out by the present study.