TYROSINE HYDROXILASE IN TELENCEPHALON AND DIENCEPHALON OF RHODEUS SERICEUS (CYPRINIDAE)
E. V. Pushchina
Institute of Marine Biology, Far East Branch of RAS, Vladivostok;
e-mail: puschina@mail.ru
Immunohistochemical labeling of tyrosine hydroxylase was used to demonstrate catecholaminergic neuronal populations in the telencephalon and dienccphalonof
adult cypryniform fish Rhodeus sericeus. Various immunoreactive cell populations have been found in the telencephalon (ventral, central and lateral nuclei of
ventral telencephalic area). Immunoreactive cells and fibers were discovered in dorsal nucleus of ventral telencephalic area and supracomissural nucleus in the caudal
part of the telencephalon. In the diencephalon, periventricular nuclei (preoptic, periventricular nucleus of posterior tuberculum and periventricular organ) contained
considerable TH-ergic cells. High activity of tyrosine hydroxylase was revealed in the pretectal, ventro-medial, ventro-lateral and suprachiasmatic nuclei.
Periventricular hypothalamic nuclei also displayed high activity of tyrosine hydroxylase. Pseudounipolar neurons prevailed in all TH-immunereactive structures of the
telencephalon and diencephalon: numerous bipolar liquor-contacting cells were discovered in the periventricular nuclei. Large pear-shaped cells and bipolar TH-ergic
cells were found in posterior tuberculum. These cells may be functionally related to the dopamine-acquiring system.
Key words: tyrosine hydroxylase, dopamine, Cyprynidae, dopamine-acquiring system, posterior tuberculum, hypothalamus
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