REFLEX CARDIAC AND RESPIRATORY INHIBITION IN THE ELASMOBRANCH, SCYLLIUM CANICULA

Chromatic Behaviour of Scyllium Canicula

Prosomeric organization of the hypothalamus in an elasmobranch, the catshark Scyliorhinus canicula

The hypothalamus has been a central topic in neuroanatomy because of its important physiological functions, but its mature organization remains elusive. Deciphering its embryonic and adult organization is crucial in an evolutionary approach of the organization of the vertebrate forebrain. Here we studied the molecular organization of the hypothalamus and neighboring telencephalic domains in a c...

Tonic and reflex control of the cardio-respiratory system by neurons in the ventral medulla

To investigate the channels and neurotransmitters in the ventrolateral medulla (VLM) oblongata that are responsible for the maintenance of sympathetic tone and cardio-respiratory reflex regulation. Microinjections of excitant amino acid (glutamate, 100 nl, 100 mM), calcium channel blockers, agonists and antagonists were made throughout the VLM in anaesthetized rats. Arterial blood pressure, sym...

Tonic and reflex control of the cardio-respiratory system by neurons in the ventral medulla

To investigate the channels and neurotransmitters in the ventrolateral medulla (VLM) oblongata that are responsible for the maintenance of sympathetic tone and cardio-respiratory reflex regulation. Microinjections of excitant amino acid (glutamate, 100 nl, 100 mM), calcium channel blockers, agonists and antagonists were made throughout the VLM in anaesthetized rats. Arterial blood pressure, sym...

An increase in drinking rate of two species of marine elasmobranch fish, Scyliorhinus canicula and Triakis

in the homeostatic control of body fluid and ionic balance. In terrestrial mammals, a 1–2 % deficit in cellular fluid volume is sufficient to induce a powerful drinking response, whereas 8–10 % of extracellular fluid loss is required to induce dipsogenesis (Fitzsimons, 1998). As a consequence, an increase in plasma osmolality, or hyperosmoraemia, acts as a more acute trigger for drinking in mam...