Morphological heterogeneity within the cingulate cortex in rat: a horseradish peroxidase transport study.
Animals; Biological Transport/physiology; Cerebral Cortex/anatomy & histology/physiology; Diencephalon/anatomy & histology/physiology; Gyrus Cinguli/*anatomy & histology/metabolism/physiology; Horseradish Peroxidase/*pharmacokinetics; Injections; Male; Mesencephalon/anatomy & histology/physiology; Neural Pathways/anatomy & histology/physiology; Pons/anatomy & histology/physiology; Prosencephalon/anatomy & histology/physiology; Rats; Sprague-Dawley; Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; Wheat Germ Agglutinins/*pharmacokinetics
We compared the connections of two areas within rat cingulate cortex, the Cg1/Cg2 area vs the Cg3 area, by iontophoresing small quantities of wheatgerm agglutinin-horseradish peroxidase (WGA-HRP) into either of these two divisions and identifying afferent and efferent connections. Cortical projections were more widespread for the cingulate cortex (Cg3) area than for the Cg1/Cg2 area and included the dysgranular and agranular insular cortex, and perirhinal cortex. The Cg3 area received input from the CA1 layer of the hippocampus while the Cg1/Cg2 area was interconnected primarily with retrosplenial cortex. In the brainstem, both received input from Barrington's nucleus however, many of the subcortical connections of the two areas differed and supported the hypothesis that the Cg3 area is part of the limbic and visceral motor system while the Cg1/Cg2 area is more closely allied with somatic motor control. The Cg3 area received input from the basolateral nucleus of the amygdala, the supramammillary hypothalamic nucleus, the laterodorsal tegmental nucleus, and the lateral parabrachial nucleus. The Cg1/Cg2 area received input from the substantia nigra and targeted deep layers of the superior colliculus. Thus, rat cingulate cortex is a heterogeneous area that can be further subdivided into separate limbic/autonomic (Cg3) and somatic motor areas (Cg1/Cg2).
Zeng D; Stuesse S L
Brain research
1991
1991-11
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1016/0006-8993(91)91661-j" target="_blank" rel="noreferrer noopener">10.1016/0006-8993(91)91661-j</a>
Brainstem neurons with descending projections to the spinal cord of two elasmobranch fishes: thornback guitarfish, Platyrhinoidis triseriata, and horn shark, Heterodontus francisci.
*Stilbamidines; Animals; Axonal Transport; Brain Stem/*anatomy & histology/physiology; Diencephalon/anatomy & histology/physiology; Fishes/*anatomy & histology; Fluorescent Dyes; Horseradish Peroxidase; Mesencephalon/anatomy & histology/physiology; Neural Pathways/anatomy & histology/physiology; Neurons/*cytology/physiology; Pons/anatomy & histology/physiology; Reticular Formation/anatomy & histology/physiology; Species Specificity; Spinal Cord/*anatomy & histology/physiology
We studied two cartilaginous fishes and described their brainstem supraspinal projections because most nuclei in the reticular formation can be identified that way. A retrogradely transported tracer, horseradish peroxidase or Fluoro-Gold, was injected into the spinal cord of Platyrhinoidis triseriata (thornback guitarfish) or Heterodontus fransisci (horn shark). We described labeled reticular cells by their position, morpohology, somatic orientation, dendritic processes, and laterality of spinal projections. Nineteen reticular nuclei have spinal projections: reticularis (r.) dorsalis, r. ventralis pars alpha and beta, r. gigantocellularis, r. magnocellularis, r. parvocellularis, r. paragigantocellularis lateralis and dorsalis, r. pontis caudalis pars alpha and beta, r. pontis oralis pars medialis and lateralis, r. subcuneiformis, r. peduncularis pars compacta, r. subcoeruleus pars alpha, raphe obscurus, raphe pallidus, raphe magnus, and locus coeruleus. Twenty nonreticular nuclei have spinal projections: descending trigeminal, retroambiguus, solitarius, posterior octaval, descending octaval, magnocellular octaval, ruber, Edinger-Westphal, nucleus of the medial longitudinal fasciculus, interstitial nucleus of Cajal, latral mesencephalic complex, periventricularis pretectalis pars dorsalis, central pretectal, ventromedial thalamic, posterior central thalamic, posterior dorsal thalamic, the posterior tuberculum, and nuclei B, F, and J. The large number of distinct reticular nuclei with spinal projections corroborates the hypothesis that the reticular formation of elasmobranches is complexly organized into many of the same nuclei that are found in frogs, reptiles, birds, and mammals.
Cruce W L; Stuesse S L; Northcutt R G
The Journal of comparative neurology
1999
1999-01
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
<a href="http://doi.org/10.1002/(sici)1096-9861(19990125)403:4%3C534::aid-cne8%3E3.0.co;2-8" target="_blank" rel="noreferrer noopener">10.1002/(sici)1096-9861(19990125)403:4%3C534::aid-cne8%3E3.0.co;2-8</a>