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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 ...
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 ...
The vomeronasal cartilage is a thin piece of hyaline cartilage that attaches to the vomer and extends to the septal nasal cartilage. [10] This structure is associated with the vomeronasal organ, which is part of the accessory olfactory system. This associated organ plays an important role in the sense of smell by being lined with similar ...
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 ...
The vomeronasal organ is located at the back of the septum and has a role in pheromone detection. The nasal cavity has a nasal valve area that includes an external nasal valve and an internal nasal valve. The external nasal valve is bounded medially by the columella, laterally by the lateral nasal cartilage, and posteriorly by the nasal sill. [5]
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 ...
Nose. A nose is a sensory organ and respiratory structure in vertebrates. It consists of a nasal cavity inside the head, and an external nose on the face. The external nose houses the nostrils, or nares, a pair of tubes providing airflow through the nose for respiration. Where the nostrils pass through the nasal cavity they widen, are known as ...
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.