Ductus incisivus
1 incisive papilla,
2 hard palates ,
3 palatal palate,
4 palatal suture,
5 soft palate ,
6 soft palate almond
The ductus incisivus ("intermaxillary duct ") is a pair of oblique-vertical, rostroventrally oriented connecting duct in the area of the intermaxillary bone ( os incisivum ) of the hard palate in mammals . In various mammals it represents a parallel, mucous membrane-lined duct, which connects the nasal and oral cavities in their front sections, and is therefore also called the ductus nasopalatinus .
In the oral cavity the gear on a small protrusion behind the empties cutting teeth ( incisors ), the incisive papilla . In some species - for example humans and horses - the ductus incisivus is closed on the side of the oral cavity and thus a duct that starts out from the nose and ends blindly. The incisive papilla is still developed (see picture).
From the ductus incisivus or nasopalatineus a blind, horizontal duct extends caudally (“tail towards the rear”). This separate branch is called the vomeronasal duct and houses the Jacobsonian organ (rudimentary in humans) , which is an additional organ of smell and weather and is also known as the vomeronasal organ . Odors can reach this olfactory organ, located in the corridor of the same name, from the nasal and / or oral cavity depending on the formation of the ductus nasopalatinus or ductus incisivus .
The paired ductus incisivi lies together with vessels and nerves, the paired nervus nasopalatinus , in the surrounding bony canal, the canalis incisivus . Its palatal opening is located as a foramen incisivum under the papilla incisiva; the nasal openings are called the Stenson's foramina .
literature
- Franz-Viktor Salomon: Anatomy for veterinary medicine . Enke-Verlag Stuttgart, 2nd ext. Edition 2008, p. 243, ISBN 978-3-8304-1075-1