Light and electron microscopic studies were done on microliths in unilateral undescended testes to determine the origin and structure. The microliths seem to originate from degenerating intratubular cells and consist of a central calcified core surrounded by concentric layers of connective fibers.
The ultrastructure of the excretory-secretory system of Toxocara canis infective larvae is described. The system is composed of a single uninucleate cell forming two elongate columns that extend throughout the length of the worm up to the anterior portion of the intestine. The cytoplasm shows an abundant endoplasmic reticulum and an extensive Golgi complex from which many vesicles of variable density originate. The material of the vesicles is discharged into the lumen of an intracellular duct crossing the two columns of the gland cell. These ducts appear as sinuous canals surrounded by a series of small, interconnected cavities. The excretory ducts join by means of transversal canals which, in turn, flow into a common duct opening outside through an excretory pore.
Zusammenfassung
Bei zwei infertilen Patienten wurden Akrosom‐Fehlbildungen der Spermatiden und Spermatozoen mittels der Licht‐ und Elektronenmikroskopie untersucht. Die erste sichtbare Abnomität trat in der Frühstadien der Spermatidenentwicklung auf. Die detaillierte morphologische Analyse der fehlgebildeten Spermatiden ergab in den meisten Fällen ausschließlich eine Beeinträchtigung der Akrosomgranula. Das kann die Ursache für die Fehlbildungen bei den reifen Spermatozoen sein. Die Tatsache, daß fast die Hälfte der frühen Spermatiden keine Akrosomgranula besitzt, deutet auf eine genetische Ursache hin und darauf, daß die Gene in der haploiden Phase dargestellt sind.
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