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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Anatomy and embryology 170 (1984), S. 117-121 
    ISSN: 1432-0568
    Keywords: Sexual dimorphism ; Serotonin fibers ; Lumbar cord ; Cremaster ; Immunohistochemistry ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Sexual dimorphism in the topographical organization of immunoreactive serotonergic fibers has been shown for the first time in the anterior column of the rat lumbar cord. A characteristic preferential arrangement of serotonergic fibers on the small cell column composed of anterior horn motoneurons, which have been proved to send their axons to the cremaster muscle, was demonstrated at the lumbar segments (L1–L2) of male rats, using the immunoperoxidase technique with antiserum against serotonin. A similar finding was also observed in female rats, but was less prominent than in males. Comparative analysis of the cell numbers and the size of neuronal somata of the aforementioned nucleus, done using retrograde transport of fluorescent dye (DAPI) via axonal fibers coursing down the genitofemoral nerve to the cremaster muscle, gave significantly larger values in males. The sexual difference in the serotonergic innervation pattern was, in consequence, surmised to be caused by the cytoarchitectonic contrast ascertained in the lumbar anterior column. Furthermore, there may be a striated muscle endowed with some active functions homologous to those of the male cremaster muscle in the female rat.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0878
    Keywords: Serotonin fibers ; Spinal cord ; Immunohistochemistry ; Monkey (Macaca fuscata)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A modified procedure of PAP-immunohistochemistry with the use of a rabbit antiserum against serotonin was applied to investigate the pattern of serotonin-containing nerve fibers in the spinal cord of the monkey, Macaca fuscata. The majority of descending serotonin fibers in the white matter is located immediately below the pia mater in the ventrolateral funiculi. Lamina I and the outer zone of lamina II are supplied with numerous serotonin fibers. In the intermediate gray, two prominent bundles composed of longitudinal fibers, i.e., lateral and medial longitudinal serotonin bundles, were recognized at the lateral column and in the vicinity of the central canal, respectively. The motoneurons of the anterior horn are encompassed by fine networks of serotonin fibers and terminals. The results obtained from studies with the monkey spinal cord closely resemble those characteristic of the dog spinal cord as presented in a previous paper, except for portions of the lumbar level. In segments L3–L4, intercalated cell groups between the medial and lateral motor nuclei receive particularly rich inputs of serotonin fibers in the same manner as the neurons of the nucleus intermediolateralis. This peculiar finding may suggest the presence of a specialized nucleus in the anterior column of the simian and also human spinal cord.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 226 (1982), S. 477-491 
    ISSN: 1432-0878
    Keywords: Serotonin fibers ; Spinal cord ; Immunohistochemistry ; Dog
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Distribution of serotonin fibers in the spinal cord of the dog was investigated by means of a modified PAP method; a rabbit anti-serotonin serum prepared in the laboratory of the authors was used in this study. Serotonin fibers were revealed as PAP-positive dark-brown elements displaying dot-like varicosities (0.5–2.0 μm in diameter). In the spinal cord of the dog, the distribution of serotonin fibers is extensive. These fibers occur more densely in more caudal segments and are most prominent at the sacrococcygeal level. From the level of the cervical spinal cord to the upper lumbar region, the descending serotonin fibers are located immediately under the pia mater in the ventrolateral portion of the lateral funiculus. In more caudal segments, serotonin fibers are dispersed throughout the ventral and lateral funiculi. These longitudinal en passage-fibers send numerous transverse collaterals to the gray matter. Serotonin fibers are distributed abundantly in the laminae I and III of the posterior column, while only a few fibers are found in the lamina II (substantia gelatinosa). In the intermediate zone, two descending serotonin pathways, i.e., lateral and medial longitudinal bundles, are observed to coincide topographically with the nucleus intermediolateralis at C8(T1)-L3(L4) and the nucleus intermediomedialis at C1-Co respectively. The former is particularly prominent and communicates with the contralateral bundle via commissural bundles at intervals of 300–500 μm. The large motoneurons in the anterior column, especially those in the nucleus myorabdoticus lateralis within the cervical and lumbar enlargements, are closely surrounded by fine networks of serotonin fibers and terminals.
    Type of Medium: Electronic Resource
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