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New ways to go-nasal floor structures as channelling system for vomeronasal stimuli in the shrew (Sorex araneus, Mammalia)

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Nowack C., Wohrmann-Repenning A.

Acta Theriologica

2011

tom 56

nr 4

The mammalian lateral nasal gland (LNG, also called Steno’s gland) is known to be one source of so-called odorant-binding proteins, which are suggested to work as vehicles to carry chemosensory stimuli within the nasal cavity in order to guide them to olfactory and vomeronasal sensory neurons. Up to now, a largely unattended and unanswered question is how the secretions of the LNG migrate between the glandular opening at the upper edge of the anterior lateral nasal wall and the more caudally located vomeronasal organ. In order to address this issue, the functional morphology of the rostral nasal cavity of Sorex araneus was investigated histologically. Special interest was laid on the opening region of the LNG in the vestibular region of the nose and its topological connection to a hitherto largely unnoticed nasal concha, the atrioturbinate. It appears that the atrioturbinate serves as a specialised channel that directs the secretions of the LNG pointedly towards the entrance of the vomeronasal organ. In addition, it was observed that—contrary to previous reports—the LNG in Sorex araneus is anatomically clearly separated from the maxillary sinus gland and does not invade the maxillary sinus.

Functional anatomy of the vomeronasal complex in the embryonic development of the pig [Sus scrofa dom.]

100%

Wohrmann-Repenning A., Barth-Muller U.

Acta Theriologica

1994

tom 39

nr 3

The vomeronasal complex of 5 different aged pig embryos Sus scrofa dom. Linnaeus, 1758 with a total length (TL) of 330, 180, 75, 50 and 45 mm respectively were studied. In all cases the nasopalatal part surrounding Jacobson's organ was generally established. During the studied period of development the completion of details within the cartilaginous supporting structures were of primary interest. In the youngest embryo studied, ducts and furrows of the vomeronasal complex were blocked by fused epitheliums. Their dissolvement was completed in an embryo of 57 mm (TL). The elaborated vomeronasal complex of the oldest embryo allowed some further analyses. So it proved that all morphological peculiarities of the supporting structures, the nasopalatine ducts and the papilla palatina in pigs are an indication of their importance to a properly functioning vomeronasal complex. As pigs have no rhinartum or cleft snout of the kind found in most mammals, no philtrum communicates with the sulcus papillae palatinae and the nasopalatine ducts where Jacobson's organs merge into. Their flat snout is however provided with a dinstict ventral groove which is obviously a substitute for the missing philtrum. Generally it was possible to classify the vomeronasal complex in S. scrofa from a phylogenetic point of view. As this anatomical system in placental mammals fundamentally reveals two differing construction types, classified as either primitive or progressive S. scrofa possesses a progressively developed vomeronasal complex.

Ograniczanie wyników

2 Acta Theriologica

2 Wohrmann-Repenning A.

1 Barth-Muller U.

1 Nowack C.

1 2011

1 1994

Wyniki wyszukiwania

New ways to go-nasal floor structures as channelling system for vomeronasal stimuli in the shrew (Sorex araneus, Mammalia)

Functional anatomy of the vomeronasal complex in the embryonic development of the pig [Sus scrofa dom.]