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1. The distribution of substance P-like immunoreactivity was studied in Hydra attenuata using the peroxidase-antiperoxidase technique. 2. Positive immunoreactivity was observed in ectodermal nerve cells and fibers as well as in nematoblasts at various stages of differentiation. 3. Administration of synthetic substance P to regenerating hydra did not affect(More)
The ventricular sulcal pattern and the cytoarchitectonic organization of the brain stem of the frogs Rana esculenta and Rana catesbeiana have been studied in transversely cut, Nissl stained serial sections. Four longitudinal sulci, the sulcus medianus inferior, the sulcus intermedius ventralis, the sulcus limitans and the sulcus medianus superior could be(More)
The habenular nuclei of the elasmobranch "Scyllium stellare" have been studied with conventional histological techniques for light microscopy. Their left-right asymmetry has been defined by the observation of serially cut sections. In addition, their cytoarchitectonic organization has been defined quantitatively. In all specimens observed, the left habenula(More)
The olfactory system of the frog Rana esculenta was studied by using horseradish peroxidase (HRP) tracing of axonal pathways. Injections of HRP were made in the main olfactory bulb (MOB), accessory olfactory bulb (AOB), anterior olfactory nucleus (AON), the amygdala (AMY), and in a zone of the leteral wall of the telencephalic hemisphere immediately(More)
Male and female frog brains stained according to the Nissl method and cut transversely, 15 microns thick, at the level of the habenular nuclei, were investigated in spring and winter. Right and left habenular nuclei were examined. The volume and the standard deviations were calculated in each portion of the habenular nuclei investigated. The frog habenula(More)
A cobaltic lysine complex was injected separately into the right and left fasciculi retroflexes of the frog. This tracing technique labeled, in a Golgi-like manner, the neurons which initiate the fasciculi retroflexes and revealed details of their morphological pattern. The fasciculi retroflexes originate from various neurons distributed in the diencephalon(More)
The central myelin of the phylogenetically ancient shark Scyllium stellare (Elasmobranchii, Selachii) was examined at the electron microscope. The known different chemical compositions of the myelin in higher and lower vertebrates is not associated in the Scyllium with a lack of any basic structural myelin elements, but is probably linked to variations in(More)
  • M Kemali
  • 1975
Some neurons and glial cells of the interpeduncular nucleus of the adult frog Rana esculenta contain one cilium. The cilium complex shows two-centriole basal organization. Cross striated structures are seen apposed to the centriolar formations. The centriole and associated basal body are always close to the vesicular elements of the Golgi apparatus in the(More)