Organization of tyrosine‐hydroxylase immunopositive neurons in the brian of the crested newt, Triturus cristatus carnifex

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Abstract
The localization of neurons, fibers and terminals containing tyrosine hydroxylase (TH)‐like immunrectivety was stuided in the brain of the crested newt by using an antiserum to rat phaechromocytoma tyrosine hydroxylase. Immunoreactive cells and fibers were found in the spinal cord, the medulla oblongate (lateral periventricular areas), and the aceustolateral area. In the tegmentum mesencephali, two bilaterl clusters of labelled cells were localized in the ventrolateral periventrilcular gray extending toward the caudal hypothalamus. In the hypothalamic tuberal lobes, the TH‐like reactive nurons, frequently of CSF‐contacting type, lined the dorsal wall lof the lateral linfundibular recesses. A thick network of TH‐like reactive nerve fibers and terminals was observed in the percascular zone of the median emience and in the adenohypophysial pars intermedia. A number of labelled cell bodies were also found in the dorsal thalamus (pars intercalaris diencephali), the paraventricular organ, and the ventral wall of the preoptic recess. In the telencephalon, immunoreactive innervatkion was indentified in the striatum, together with immunoposite cell bodies in the olfactory bulbs. The pattern of organization of TH‐immunoreactive sytems in the newt showed, except for some peculiarities (e.g., the labelled cell bodies in dorsal thalamus), close similarities to the arrangement typical of mammals.