Osphradium


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osphradium

[äs′frād·ē·əm]
(invertebrate zoology)

Osphradium

 

a receptor organ of mollusks, formed of specialized sensory epithelium. The osphradium is located in the mantle cavity, usually where the water passes to the branchial organs. It is well developed in some gastropod mollusks, in which it apparently serves as an olfactory organ. The functions of osmoreception and mechanoreception are also attributed to the osphradium.

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The gill, osphradium, and hypobranchial gland can be taken together in a selection of mantle tissue 1 cm from the mantle edge, at the border of the first incision made during the dissection.
The gill is examined in a transverse section of mantle that includes the osphradium running in parallel.
Remarks and differences: Low, broad fold of siphon's right base separates anterior end of osphradium from gill and is somewhat taller (Fig.
The fold of the siphonal base separating the anterior end of the osphradium from the gill in B.
Schild, "Chemosensitivity of the osphradium of the pond snail Lymnaea stagnalis," The Journal of Experimental Biology, vol.
Activity in the pallial nerve was recorded while odorant solutions were applied directly to the osphradium. The pallial nerve connects the osphradium to the supraesophageal ganglia, which is part of the central nervous system (Alexander, 1970).
Quantifying activity in the pallial nerve in response to odorant solutions required that the whelk be removed from its shell, the pallial nerves exposed, and the osphradium isolated.
Anatomical and electrophysiological studies on the gastropod osphradium. Symposia of the Zoological Society of London 23:263-268.
Fine structure and vital staining of osphradium of the southern oyster drill, Thais haemastoma canaliculata (Gray) (Prosobranchia: Muricidae).
The osphradium is an important chemosensory organ that receives waterborne chemical cues via water being pumped through the oyster drill's siphon.
Our comparative study also included the morphologically peculiar organ of an ampullariid snail (Haszprunar, 1985) and the mantle epithelia surrounding the prosobranch osphradium as well as that of a pelecypod, the freshwater mussel Anodonta cygnea, which has a poorly developed osphradium.
In all three prosobranch species examined, the osphradium is situated in the mantle roof, at the base of the siphon, which means that it is exposed to the inhalant current of external water.