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- W2039821857 abstract "The structure of sperm from the lobster, Homarus americanus, was examined using light and electron microscopy. These sperm consist of an acrosome, subacrosomal region, collar, nucleus, and three spikes which are extensions of the nucleus. The acrosome is a cylinder projecting from the sperm's antierior pole. It is comprised of inner acrosomal material, outer acrosomal material, and an apical cap, and is limited by a single continuous membrane. The subacrosomal material is finely granular with most of it lying in a fossa in the base of the acrosome. The collar, a region subjacent to the subacrosomal material, contains small mitochrondria and a pair of centrioles. The subacrosomal material and collar are in direct continuity with the chromatin of the nucleus. The nucleus itself is limited by a highly folded, thick membrane which probably represents a composite of the plasma membrane and nuclear envelope. The chromatin is granular or fibrillar and is uncondensed. The spikes are compartments of the nucleus and contain microtubules ensheathed by sheets of membrane. Ionophore A23187 which is fluorescent inserts into membranes of cells and was used to study the distribution of spike membranes in sperm with the aid of a fluorescent microscope. The microtubule/membrane complexes of the spikes converge in the region of the collar and interconnect to form a three-sided vault the apex of which terminates immediately beneath the base of the acrosome. These lobster sperm are similar in structure to other reptantian sperm." @default.
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- W2039821857 date "1980-03-01" @default.
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- W2039821857 title "The structure of sperm from the lobster, Homarus americanus" @default.
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- W2039821857 doi "https://doi.org/10.1016/s0022-5320(80)80011-6" @default.
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