Aminergic neurons in the hypothalamus of the dogfish, Scyliorhinus canicula L. (Elasmobranch). A histofluorescence study.
Aminergic neurons of the hypothalamus of Scyliorhinus canicula were studied using formaldehyde-induced fluorescence. An aminergic organ of the preoptic recess (PRO) consists of both cerebrospinal fluid (CSF)-contacting and non-contacting green-yellow fluorescent neurons of bipolar or multipolar morphologies. Caudal to the optic chiasma a group of faint fluorescent neurons is located among the fibres of the commissura transversa. In the posterior hypothalamus the infundibular wall has numerous aminergic CSF-contacting neurons along lines of diverticles. Scarce CSF-contacting neurons are also found in the roof and floor of the recesses of the inferior hypothalamic lobes. The folded posterior recess has a very high number of aminergic CSF-contacting neurons of bipolar shape. Its coarse layer of cell bodies is covered by a large amount of fluorescent fibres which form a conspicuous cap-like band. These structures are discussed from a comparative point of view in relation with aminergic hypothalamic systems of other anamniote vertebrates.
Rodriguez-Moldes
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I
Departamento de Biología Fundamental, Universidad de Santiago de Compostela.
Anadon
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R
D000818:Animals; D001679:Biogenic Amines / Q000502:physiology*; D004284:Dogfish / Q000033:anatomy & histology* / Q000502:physiology; D007031:Hypothalamus / Q000166:cytology*; D007034:Hypothalamus, Posterior / Q000166:cytology; D008856:Microscopy, Fluorescence; D009474:Neurons / Q000166:cytology*; D012754:Sharks / Q000033:anatomy & histology*
D001679:Biogenic Amines