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 ?
stridulans (Jackson (Chong and Developmental et al., Sasekumar, stage Characters 1989) 1994) Egg diameter (mm) -- 0.697-0.729 Nauplius shape -- pandulate Third stage dorsomedian abdominal protozoea spines 5 3 First stage posterior ventral mysis serrations on the carapace absent absent Third stage statocyst present absent mysis First stage scaphognathite setae postlarva in maxilla 20 21 scaphocerite spines on outer margine of antenna 1 2 thoracic sternal plate spines 2, 2, 0, 0, 0 -- M.
We determined whether each photographed individual was a veliger, pediveliger, or juvenile based on the presence or absence of the velum, foot, statocyst, and mantle.
In two such instances, which were recorded in different sagittal plane slices tilted at 90[degrees], a bristle group on the lower side of the statocyst suddenly flopped to the epithelial floor, towards the nearby ciliary dome, then straightened immediately, returning to its previous upright stance (Fig.
The statocyst of ctenophores is a long-studied structure whose function is generally understood.
The ctenophore statocyst exploits both motile and sensory functions of cilia (Tamm, 1982, 2014a, b).
The squid statocyst and its sensory hair cells share many characteristics with vertebrate vestibular systems yet maintain intriguing morphological differences, despite the functional commonalities of the two systems (Dilly et al., 1975; Dilly, 1976; Stephens and Young, 1982).
The rhopalial touch plates and sensory pads may represent sensory components of statocyst function in cubomedusae considering the tight placement of rhopalia in their rhopalial niches (which can totally enclose the rhopalia in some species) and the constant movement of the tissues during swimming.
Additionally, GABA reduces the resting electrical activity of the squid statocyst (Tu and Budelmann, 2000).
Four perradial and four interradial rhopalia in deep pits, surrounded by two thickened lips in subumbrella, [approximately equal to]27% of marginal bell radius (= 8.19 cm) from bell margin; rhopaliar pit depth [approximately equal to]1 mm, rhopaliar pit width [approximately equal to] 4.2 mm, rhopaliar pit length [approximately equal to] 6.9 mm; rhopalium has simple statocyst without obvious ocellus (Fig.
vulgaris, they have been found in both the statocyst and brain (Budelmann and Thies, 1977).
The role of [Ca.sup.2+] in deflection-induced excitation of motile, mechanoresponsive balancer cilia in the ctenophore statocyst. J.