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The vomeronasal organ (VNO), or Jacobson's organ, is the paired auxiliary olfactory (smell) sense organ located in the soft tissue of the nasal septum, in the nasal cavity just above the roof of the mouth (the hard palate) in various tetrapods. [1] The name is derived from the fact that it lies adjacent to the unpaired vomer bone (from Latin ...
The vomeronasal organ, also called Jacobson's organ, is a chemoreceptor organ named for its closeness to the vomer and nasal bones, and is particularly developed in animals such as cats (who adopt a characteristic pose called the Flehmen reaction or flehming when making use of it), and is thought to have to do with the perception of certain ...
Vomeronasal receptors are a class of olfactory receptors that putatively function as receptors for pheromones. Pheromones have evolved in all animal phyla, to signal sex and dominance status, and are responsible for stereotypical social and sexual behaviour among members of the same species. In mammals, these chemical signals are believed to be ...
Frontal section of nasal cavities of a human embryo 28 mm long. (Vomeronasal cartilage labeled at bottom left.) The vomeronasal cartilage (or Jacobson's cartilage) is a narrow strip of cartilage, low on the medial wall of the nasal cavity. It lies between the septal nasal cartilage and the vomer. The cartilage lies below, but is not connected ...
Anatomical terminology. [ edit on Wikidata] The olfactory system, or sense of smell, is the sensory system used for olfaction (i.e., smelling). Olfaction is one of the special senses directly associated with specific organs. Most mammals and reptiles have a main olfactory system and an accessory olfactory system.
All fish perceive odors though nostril-like structures called nares. Most fish lack vomeronasal structures, yet they are still able to detect pheromones through vomeronasal-related genes. In lieu of the organ, fish possess sensory epithelium that contains three types of sensory cells, two of which are responsible for sex pheromones and social ...
The human nose is the first organ of the respiratory system. It is also the principal organ in the olfactory system. The shape of the nose is determined by the nasal bones and the nasal cartilages, including the nasal septum, which separates the nostrils and divides the nasal cavity into two. The nose has an important function in breathing.
Ewes whose vomeronasal organs were rendered non-functional by electro-cauterization failed to reject alien lambs at the udder, and were noted to perform more maternal flehmens, a behavior related to vomeronasal activity. The lack of vomeronasal function was confirmed based on the formation of complete mucosal scarring over both oral and nasal ...