Statocyst


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Related to Statocyst: strobila, statolith, ocellus

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 ?
Water currents in the statocyst cavity have not been tracked systematically by particles or dyes.
Ctenophores have an equilibrium receptor system, or statocyst, that uses the gravitational field as a reference (Horridge, 1966, 1971, 1974; Budelmann, 1988).
It has long been known that lithocytes arise from the thickened epithelial floor of the statocyst in ctenophores (Chun, 1880; Samassa, 1892; Tamm, 1982).
The statocyst is analogous to the fish otolith system (Fay, 1974) and, to some extent, may share functions of the inner ear hair cells of higher vertebrates (Yost, 1994).
Hyperpolarizing potentials have been described in the squid stellate ganglion (Miledi, 1972), in secondary hair cells and afferent neurons of the squid statocyst (Williamson, 1989), and in central neurons of the cuttlefish (Chrachri and Williamson, 2003).
vulgaris, they have been found in both the statocyst and brain (Budelmann and Thies, 1977).
2+] in deflection-induced excitation of motile, mechanoresponsive balancer cilia in the ctenophore statocyst.
Evidence that histamine acts as a neurotransmitter in statocyst hair cells in the snail, Lymnaea stagnalis.
Rotation of the statocyst has been shown to be an adequate stimulus for evoking depolarizing generator potentials and an increase in spike activity in Hermissenda hair cells (Alkon, 1975).
In molluscs, visual and vestibular information is conveyed by ocular photoreceptors located in the eye, and vestibular information is transmitted by hair cells of the statocyst.