Biomedical subjects

F Wallois

Publications and source records attributed to F Wallois.

21 records · Page 2Linked to original sources

PubMed1991

Trigeminal afferences implied in the triggering or inhibition of sneezing in cats.

The aim of this study was to precise the role of the different trigeminal nerve branches involved in innervation of the nostril in triggering the sneeze reflex. Electrical stimulation of the anterior ethmoidal, posterior nasal and infraorbital nerves was performed in anaesthetized cats. Stimulation of these 3 nerves produced sneezing identical to that induced by mechanical stimulation. Our results emphasize inhibition of the sneeze reflex related to stimulation of the anterior ethmoidal or the posterior nasal nerves by stimulation of the infraorbital nerve.

Afferent Pathways↗

PubMed1991

Trigeminal nasal receptors related to respiration and to various stimuli in cats.

In twenty adult cats of either sex under nembutal anaesthesia, we aimed at delineating the sensitive territory of trigeminal nerves innervating the nasal mucosa. The different trigeminal nerves (anterior ethmoidal, posterior nasal and infraorbital nerves) were dissected in the orbit. Activity of these nerves was recorded during spontaneous nasal and tracheal breathing and in response to various stimuli: mechanical (manual probing and air jets) and irritants (ammonia vapours). Multiple and unitary activity recorded in nerve filaments enabled a classification of the receptors on the basis of their discharge pattern as rapidly-, intermediately- or slowly adapting receptors, and as drive or non-drive nasal receptors depending on whether or not the respiratory modulation was preserved during tracheal breathing.

Afferent Pathways↗

PubMed1988

Phrenic-to-phrenic inhibition and excitation in spinal cats.

In decerebrate, C2-spinalized cats, stimulation of the C6-phrenic root produces a weak activation of phrenic motoneurons in the adjacent C5 segment in a few animals (23%). When phrenic motoneurons are electrically excited by testing stimulation applied to the spinal cord or internal intercostal nerve, the evoked responses recorded in a cervical phrenic root are partly inhibited by conditioning stimulation applied to another ipsilateral or contralateral cervical phrenic root. We therefore conclude that phrenic fibers exert both inhibitory and excitatory effects on adjacent phrenic motoneurons in the cervical spinal cord.

Animals↗