Statocyst

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statocyst

[′stad·ə‚sist]
(botany)
A cell containing statoliths in a fluid medium. Also known as statocyte.
(invertebrate zoology)
A sensory vesicle containing statoliths and which functions in the perception of the position of the body in space.

Statocyst

 

(1) An auditory vesicle, the organ of equilibration in invertebrates. Statocysts are in the form of a pit or a vesicle embedded under the outer skin covering. They may also be in the form of a flask-shaped protrusion (for example, in medusae and sea urchins). A statocyst contains one or more solid formations, which are known as statoliths, or otoliths. When the body position is changed, the otoliths move, thus stimulating the sensory cells of the statocyst. The nerve impulse is transmitted from the sensory cells along the nerve fibers to the central nervous system, causing a response that leads to restoration of equilibrium.

(2) A plant cell in which tiny, mobile starch granules, known as statoliths, are formed. Statocysts are found in the rootcaps, the apices of cereal coleoptiles, and other growing parts.

References in periodicals archive ?
The percent downward displacement of the statolith at 90[degrees] and 270[degrees] for sagittally and tentacularly tilted statocysts was averaged and plotted as a function of the plane of tilting.
Eyes absent; no nuchal organs; no so-called statocysts in the dorso-anterior part of the prostomium.
Aboral observations of statocysts in Mnemiopsis of various sizes show no consistent spatial pattern of release of lithocytes with respect to individual balancers.
The fixed statocysts were then rinsed three times for 5 min in PBS (0.
As both phototactic and geotactic behaviors are commonly reported for cercariae (Fingerut et al, 2003b; reviewed in Sukhdeo and Sukhdeo, 2004), subsequent ultrastructural studies on photoreceptors and statocysts, and neural mechanisms for their integration, are warranted.
2C), where it passed between the two statocysts and beneath the cerebral commissure of the nervous system.
By day 3, the foot, velum, and shell had each enlarged, and additional features included statocysts, lightly pigmented eyes, and a small operculum.
The sensory structures stimulated by the US are the two central gravity-detecting statocysts (Alkon and Bak, 1973; Detwiler and Alkon, 1973; Detwiler and Fuortes, 1973; Alkon, 1975).
In Lymnaea, a pair of ocular eyes is located at the head surface beneath the tentacles, and the statocysts are located on the right and left pedal ganglia.
In addition, photoreception (light levels only; Chase, 1974) and balance information from statocysts (see Harrigan et al.
Also at 5 d, the statocysts, each with a single statolith, were visible, and embryos were capable of ingesting extra-embryonic yolk.