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  • Electronic Resource  (5)
  • Rat  (3)
  • Accessory oculomotor nuclei  (1)
  • Cytoarchitecture  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Cytoarchitecture and cytology of the lateral reticular nucleus in the rat (1982)
    Springer
    Anatomy and embryology 164 (1982), S. 229-242 
    Details
    ISSN: 1432-0568
    Keywords: Lateral reticular nucleus ; Cytoarchitecture ; Cytology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cytoarchitecture and cytology of the rat lateral reticular nucleus (LRN) was studied in serial sections of paraffin embedded tissue stained with cresyl violet. Cell outlines and nuclear outlines were drawn in the transverse plane and the nucleus was serially reconstructed. The LRN in the rat begins at a point just caudal to the caudal limit of the inferior olivary nucleus and extends to the mid-olivary level. The nucleus can be subdivided into a predominantly small-celled parvocellular division ventrally, a predominantly large-celled magnocellular division dorsomedially, and a subtrigeminal division dorsolaterally containing predominantly medium-sized cells. At rostral levels the nucleus comprises two parts, a medial principal portion and a lateral subtrigeminal division. Measurements of neuronal diameters yielded size distributions which confirmed the predominance of large cells in the magnocellular division, small cells in the parvocellular division and medium-sized cells in the subtrigeminal division. The neurons display multipolar, triangular, piriform and fusiform somata. All types show a range in size from small to large. The larger cells have abundant Nissl bodies which are coarse in nature and voluminous cytoplasm. The smaller cells have poorly developed Nissl bodies and scant amounts of cytoplasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318507
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  • 2
    Electronic Resource
    Electronic Resource
    Spinal projections to the lateral reticular nucleus in the rat (1982)
    Springer
    Anatomy and embryology 165 (1982), S. 345-359 
    Details
    ISSN: 1432-0568
    Keywords: Lateral reticular nucleus ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The synaptic relationships and the distribution of the afferent terminals of the spinal pathway to the lateral reticular nucleus (LRN) of the rat were examined following induced degeneration. After high cervical hemisections, the spino-LRN projection was first examined with the Fink-Heimer silver impregnation method. Degeneration was confined primarily to the ipsilateral LRN and all three divisions of the nucleus were involved. Maximum degeneration was observed in the caudal regions of the parvocellular division. The magnocellular division, except for the extreme dorsomedial area, showed substantial degeneration as well. The subtrigeminal division throughout its entire length contained only sparse degeneration. Electron microscopic examination following spinal cord lesions revealed both round and pleomorphic-vesicle terminals in various stages of electron dense degeneration. The majority of the degenerating terminals were of the round-vesicle variety. Both types of terminals contacting somata were also observed to degenerate but their number was small in comparison to those on dendritic profiles. Terminals in synaptic contact with two dendritic profiles were also observed to degenerate. Some of the large terminals belonging to synaptic configurations (glomeruli) underwent degeneration and were therefore of spinal origin as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305572
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  • 3
    Electronic Resource
    Electronic Resource
    A Golgi study of the lateral reticular nucleus in the rat (1982)
    Springer
    Anatomy and embryology 164 (1982), S. 243-256 
    Details
    ISSN: 1432-0568
    Keywords: Lateral reticular nucleus ; Golgi ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The organization of the lateral reticular nucleus (LRN) of the rat was investigated by using the Golgi technique. Golgi-Cox preparations revealed neurons with shapes similar to those observed in Nissl-stained preparations. Fusiform cells possess rectilinear dendrites with secondary dendrites which are longer than the parent stem. The remaining cell types have short dendrites which branch for three or four generations and follow a tortuous course. These two types of neurons are similar to the isodendritic and allodendritic neurons which have been reported in the reticular formation. The neurons throughout the LRN form cell clusters. In Golgi preparations five to ten cells are seen in each cluster but counterstaining reveals that the clusters are made up of many more cells than the Golgi preparations suggest. Many cells lie in close apposition and the dendrites of the cells in each cluster intertwine to form dendritic plexuses. Dendritic input from both neighbouring and distant cell clusters also contributes to the plexus formations within each cell cluster. Under high magnification, the dendrites show irregularities in their contours, including warty excrescenses, bumps and an array of spines, some of which are pedunculated. The appendages are confined primarily to distal portions of the dendrites, with few spines observed on the somata and proximal dendrites. Varicosed dendrites are also in common occurrence throughout the nucleus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318508
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  • 4
    Electronic Resource
    Electronic Resource
    An ultrastructural study of the lateral reticular nucleus in the rat (1982)
    Springer
    Anatomy and embryology 165 (1982), S. 329-344 
    Details
    ISSN: 1432-0568
    Keywords: Lateral reticular nucleus ; Ultrastructure ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A systematic study of the normal synaptic patterns within the lateral reticular nucleus (LRN) of the rat revealed various synaptic relationships. Two types of axon terminals were identified according to the morphology of the synaptic vesicles contained within them. Axon terminals with round vesicles established asymmetrical synaptic contacts with the somata and all areas of the dendritic trees including somatic and dendritic appendages. Pleomorphic-vesicle terminals established symmetrical synaptic contacts on somata and their appendages and on all sizes of dendrites and their appendages. Both round and pleomorphicvesicle terminals were infrequently seen to synapse upon the somata and proximal dendrites. The round-vesicle terminals outnumbered the pleomorphic-vesicle terminals on the dendritic trees. Terminals of the en passant type were also common throughout the LRN. Both round and pleomorphic-vesicle terminals were observed simultaneously contacting the soma and one or more dendritic profiles, or two different dendritic profiles. Synaptic configurations (glomeruli) were also observed in all three divisions of the nucleus. They consisted of a large, central, round-vesicle terminal contacting a number of small-calibre dendritic processes. This arrangement was surrounded by one or more sheets of glial lamellae. Puncta adherentia were observed on the apposed membranes of adjacent cells, adjacent dendrites and adjacent axon terminals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305571
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  • 5
    Electronic Resource
    Electronic Resource
    Supramedullary projections to the dorsal and ventral divisions of the paramedian reticular nucleus in the cat (1985)
    Springer
    Experimental brain research 58 (1985), S. 368-378 
    Details
    ISSN: 1432-1106
    Keywords: Paramedian reticular nucleus ; Accessory oculomotor nuclei ; Superior colliculus ; Motor cortex ; Postural control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Injections of combined lectin-conjugated and unconjugated horseradish peroxidase were made in the dorsal (d) and ventral (v) divisions of the paramedian reticular nucleus (PRN), a precerebellar relay nucleus, of the cat. The origins of supramedullary afferent projections to the PRN were identified in the pons, midbrain and cerebral cortex using the transverse plane of section. The data indicate a segregation of input from a number of sites to the dPRN and vPRN. The interstitial nucleus of Cajal projects bilaterally to the dPRN and predominantly to the ipsilateral side. The vPRN receives only a unilateral projection from the ipsilateral nucleus of Cajal. Major afferent projections to the vPRN arise from the ipsilateral nucleus of Darkschewitsch and the intermediate layer of the contralateral superior colliculus. Neither of these sites projected to the dPRN. The raphe nuclei and medial reticular formation of the pons and midbrain contribute a moderate input to both divisions of the PRN. A moderate bilateral cerebral cortical projection arises from the first somatomotor area (SMI). The ventral coronal and anterior sigmoid gyri project mainly to the dPRN and vPRN respectively. Smaller afferent projections arise from the posterior sigmoid gyri and area 6 of Hassler and Mühs-Clement (1964) in the medial wall of the anterior sigmoid gyrus. Inputs from the accessory oculomotor nuclei, tectal regions and the first somatomotor cortex suggest a role in postural control for the PRN which may underlie its involvement in mediating orthostatic reflexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235318
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