ISSN:
0148-7280
Keywords:
spermiogenesis
;
spermatozoon
;
ultrastructure
;
bug
;
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Biology
Notes:
An electron-microscope study of spermiogenesis and the ultrastructure of mature sperm was made on Eurygaster integriceps. During spermiogenesis, a manchette consisting of two large groups of microtubules and an unusual centriolar adjunct are formed. The latter looks like two half cylinders located almost at right angles to one another. Its wall consists of several dark layers divided by lighter areas. The centriole and its adjunct are not identified in the mature sperm. Bug spermatids have a large amount of amorphous pericentriolar matter, which assists in establishing an unusual nuclear pattern.The mature sperm is distinguished by a number of unique features. Its nucleus consists of three interconnected parts: the inner and outer cylinders and a part freely suspended along the middle piece. The intranuclear channel is blindly closed at the apical end and filled with dark amorphous matter that originates from the pericentriolar matter. The acrosome has an extracellular part resembling a diagonally striated rod, which is sometimes disengaged from its surface. The axoneme has 9+9(2) + 2 tubules. It is connected with the Nebenkern by dark arms.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrd.1120090107
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