Brain-stem Origins Of Spinal Projections In The Lizard Tupinambis-nigropunctatus
Neurosciences & Neurology; Zoology
Cruce W L R; Newman D B
Journal of Comparative Neurology
1981
1905-06
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1002/cne.901980202" target="_blank" rel="noreferrer noopener">10.1002/cne.901980202</a>
Evolution Of Motor Systems - The Reticulospinal Pathways
Zoology
Cruce W L R; Newman D B
American Zoologist
1984
1905-06
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1093/icb/24.3.733" target="_blank" rel="noreferrer noopener">10.1093/icb/24.3.733</a>
Organization Of Spinal-projecting Reticular Nuclei In The Tegu Lizard, Tupinamibis-nigropunctatus
Anatomy & Morphology
Cruce W L R; Newman D B; Ayers D F
Anatomical Record
1981
1981
Journal Article or Conference Abstract Publication
n/a
Evolution of the reticular formation.
Animals; Phylogeny; Biological Evolution; Mammals; Fishes; Reptiles; Reticular Formation/*physiology
The reticular formation of mammals contains numerous nuclei which can be recognized by their projection patterns, cytoarchitectonics, and neuropeptide/neurotransmitter content. We have identified reticular nuclei in representatives from numerous reptilian groups and ascertained presence or absence of these reticular nuclei in an attempt to use neuronal occurrence as a tool to determine phylogenetic relationships. Recently these studies have been extended to two elasmobranchs, a galeomorph shark and a ray. In this report, we concentrate on three medullary spinal projecting reticular nuclei, reticularis gigantocellularis, reticularis magnocellularis, and reticularis paragigantocellularis. We found that all three nuclei were present in rats, lizards, and elasmobranchs, but one nucleus was absent in crocodilians, and two nuclei were absent in turtles. Thus brain organization may give us clues to phylogenetic relationships. Moreover, these three reticular nuclei exhibited remarkably similar cellular morphology in mammals, reptiles, and elasmobranchs.
Cruce W L; Stuesse S L; Newman D B
Acta biologica Hungarica
1988
1905-06
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
THE ORGANIZATION OF THE REPTILIAN BRAIN-STEM RETICULAR-FORMATION - A COMPARATIVE-STUDY USING NISSL AND GOLGI TECHNIQUES
Anatomy & Morphology
Newman D B; Cruce W L R
Journal of Morphology
1982
1982
Journal Article
<a href="http://doi.org/10.1002/jmor.1051730309" target="_blank" rel="noreferrer noopener">10.1002/jmor.1051730309</a>
THE SOURCES OF SUPRASPINAL AFFERENTS TO THE SPINAL-CORD IN A VARIETY OF LIMBED REPTILES .1. RETICULOSPINAL SYSTEMS
Neurosciences & Neurology; Zoology
Newman D B; Cruce W L R; Bruce L L
Journal of Comparative Neurology
1983
1983
Journal Article
<a href="http://doi.org/10.1002/cne.902150103" target="_blank" rel="noreferrer noopener">10.1002/cne.902150103</a>
Projections from the medial agranular cortex to brain stem visuomotor centers in rats.
Female; Male; Animals; Immunohistochemistry; Rats; Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; Horseradish Peroxidase; Wheat Germ Agglutinins; Brain Stem/*cytology; Cerebral Cortex/*cytology; Phytohemagglutinins; Visual Pathways/*anatomy & histology; Inbred Strains
Projections from medial agranular cortex to brain stem in rat were determined by use of the anterograde tracers Phaseolus vulgaris leucoagglutinin, or wheat germ agglutinin conjugated horseradish peroxidase. Axonal trajectories were also followed by means of the Wiitanen modification of the Fink-Heimer degeneration technique. AGm was identified on the basis of its cytoarchitectonics. AGm projected to the anterior pretectal nucleus, the rostral interstitial nucleus of the medial longitudinal fasciculus, the medial accessory oculomotor nucleus of Bechterew, the interstitial nucleus of Cajal, the nucleus of Darkschewitsch, the nucleus cuneiformis and subcuneiformis, intermediate and deep superior collicular layers, the paramedian pontine reticular formation (reticularis pontis oralis and caudalis, and reticularis gigantocellularis), and raphe centralis superior. Differences in connections between rostral and caudal injections were observed: pontine and medullary projections were lighter from the rostral portion of AGm than from the more caudal portions of AGm. The heaviest projections to the anterior pretectal nucleus were from the caudal portion of AGm. The subcortical projections were very similar to those described for the frontal eye field in monkeys, and the majority of them targeted areas thought to be involved in coordination of gaze with head and neck movements. Thus AGm in rats may contain the homologue of the primate frontal eye fields.
Stuesse S L; Newman D B
Experimental brain research
1990
1990
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/10.1007/bf00227994" target="_blank" rel="noreferrer noopener">10.1007/bf00227994</a>