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The translucent band which lies just beneath the spinal V tract at the lower end of the spinal trigeminal nucleus (nucleus caudalis) can be divided into three layers. These three layers are distinguished by textural differences in their neuropil and by the morphology and laminar distribution of the axons and dendrites of their neurons. Layer II contains(More)
This Golgi study identifies three neuronal cell types in the substantia gelatinosa (SG) layer of the spinal trigeminal nucleus. The SG neurons are distinguished from each other based on: (1) dendritic branching pattern, (2) denritic spine distribution, (3) geometric shape of the denritic tree, (4) laminar distribution of the dendrites, (5) axonal branching(More)
This study demonstrates that the medullary dorsal horn (MDH), the most caudal subdivision of the spinal trigeminal nucleus, receives input from neurons located in the trigeminal main sensory nucleus, the more rostral subdivisions of the spinal trigeminal nucleus, and the contralateral MDH. Using the retrograde transport of horseradish peroxidase (HRP), we(More)
The present study investigated basic numerical skills and arithmetic in adults with developmental dyslexia. Participants performed exact and approximate calculation, basic numerical tasks (e.g., counting; symbolic number comparison; spatial-numerical association of response codes, SNARC), and visuospatial tasks (mental rotation and visual search tasks). The(More)
Neurons in Rexed's lamina I have the bulk of their dendritic arbors confined within this lamina. This study examines the morphology and synaptic connections of primary axons which generate axonal endings in lamina I of the spinal dorsal horn and are in position to deliver their inputs directly to lamina I neurons. Primary axons were made visible for light(More)
To examine the effects of peripheral nerve injury on second-order neurons in laminae I and II of the medullary dorsal horn, tooth pulps of all mandibular teeth in adult cats on one side were extirpated. This procedure severed and removed the receptors and terminal branches of the primary trigeminal neurons which innervate the tooth pulps of these teeth. The(More)
Trigeminal ganglia and brain stem of adult cats were studied following HRP injections into tooth pulps or after exposure of the cut end of the inferior alveolar nerve to HRP. Ipsilateral ganglion cells within a wide range of sizes were labeled in both experimental situations, whereas no labeled cells were observed in the contralateral ganglion in any(More)