Morphological and histological studies on the telencephalon of the salamander Onychodactylus fischeri

Abstract

Objective In order to probe into the morphological and histological characteristics of the telencephalon of Onychodactylus fischeri, and to enrich the comparable neurobiology. Method HE-staining method was used to describe the characters of the telencephalon of Onychodactylus fischeri. Results The olfactory bulb of Onychodactylus fischeri locates in the rastral and lateral to the cerebral hemisphere, and six distinct layers can be identified from the lateral to the medial, quite similar to Batrachuperus tibetanus and Hynobius leechii. In the cerebrum, the primordial hippocampus developed better than the primordial piriform. The former belongs to archipallium and the latter is paleopallium. Ventral to the primordial hippocampus there is a septal area which cannot be divided into medial and lateral parts. In the ventrical wall, there is neither medial limiting sulcus nor lateral limiting sulcus to saperate the primordial hippocampus and the septal area, or the primordial piriform and the corpus striatum. The corpus striatum of Onychodactylus fischeri is paleostriatum. There is choroids plexus anterior in the lateral ventricle. The cell group that located at two sides of the third ventricle is the amygdale. Besides, the shape and size of neurons within the telencephalon are poorly differentiated. Conclusion Onychodactylus fischeri is a relatively primitive type in the amphibian. The present data will help us to further understand the nerve system of tailed amphibian.

Antidepressant-Like Effects of κ-Opioid Receptor Antagonists in Wistar Kyoto Rats

“…Interestingly, electroconvulsive shock causes the upregulation of brain-derived neurotrophic factor gene expression in the region (Nibuya et al, 1995), a growth factor shown to have antidepressant-like properties (Shirayama et al, 2002; Hoshaw et al, 2005). In addition, degeneration of the piriform is thought to contribute to the behavioral phenotype seen in the olfactory bulbectomy model of depression (Song and Leonard, 2005; Wang et al, 2007). The extensive connections of the piriform cortex to the amygdala, nucleus accumbens, thalamus, and prefrontal cortex in both rodents and primates suggest that the region is well-placed in order to influence the behavioral response to stressful situations (Ray and Price, 1992; Carmichael et al, 1994; Haberly, 2001).…”

Comparative Morphology and Histology of the Brain in Chinese Toad ( Bufo gargarizans ) and Chinese Fire-billed Newt ( Cynops orientalis )

“…There have been many studies in amphibian brain such as caecilian Ichthyophis kohtaoensis, Ichthyophis beddome, salamander and fire-bellied toad (Naujoks-Manteuffel et al, 1988;Pinelli et al, 1997;Gramapurohit et al, 2000;Wang et al, 2007;Hauswaldt et al, 2007) and so on. However, a comparative study of Bufo gargarizans and Cynops orientalis brain has not been reported.…”