vesicle

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vesicle

1. Pathol
a. any small sac or cavity, esp one containing serous fluid
b. a blister
2. Geology a rounded cavity within a rock formed during solidification by expansion of the gases present in the magma
3. Botany a small bladder-like cavity occurring in certain seaweeds and aquatic plants

vesicle

[′ves·ə·kəl]
(biology)
A small, thin-walled bladderlike cavity, usually filled with fluid.
(geology)
A cavity in lava formed by entrapment of a gas bubble during solidification. Also known as air sac; bladder; saccus; vacuole; wing.
References in periodicals archive ?
9, black bars), most sperm still exhibited a normal head bearing acrosomal vesicles with no anterior projections.
edulis, the plasma membrane of the acrosomal vesicle folds back onto itself during the acrosome reaction, exposing the inner acrosomal membrane (Dan 1970).
The nucleus portion adjacent to the acrosomal vesicle posterior margin suffered an alteration in its contour and formed the marginal fossa (Fig.2a), causing a light enlargement in the subacrosomal space (Fig.2b).
The one possible exception in the literature is Echinocardium cordatum, which is described as having a stalked nuclear fossa that projects above the nucleus, topped with a round acrosomal vesicle (Afzelius, 1955, 2006).
A cap-shaped acrosomal vesicle with condensing acrosomal material covered its apical portion.
While the Golgi body remains basal, the maturing acrosomal vesicle migrates along the plasma membrane to the apex of the nucleus [ILLUSTRATION FOR FIGURES 4, 5 OMITTED] and becomes cup-shaped with the concave side facing the nucleus [ILLUSTRATION FOR FIGURES 5-8 OMITTED].
The acrosomal vesicle of protochordate spermatozoa is either ovoid, as in the urochordate Oikopleura (Holland et al., 1988), or cap-shaped, as in the cephalochordate Branchiostoma (Baccetti et al., 1972), and a distinct acrosomal process is produced de novo following the acrosomal exocytosis at the anterior end of the sperm (Holland et al., 1988).
Although a significant portion of sperm in the 118-mJ/ [cm.sup.2] treatment had disrupted acrosomal vesicles, there was no significant decrease in sperm binding.