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1

Morphological studies on envelopes of oncospheres of the hymenolepidid cestode, Fimbriaria fasciolaris [Pallas, 1781]

100%
Chomicz L., Grytner-Ziecina B., Walski M.
Acta Parasitologica
|
1995
|
tom 40
|
nr 1
The envelopes of oncospheres of Fimbriaria fasciolaris, found in the distal part of the strobila or free, were the subject of scanning electron microscope (SEM) and light microscope (LM) studies. The oncospheres inside the strobila were in close apposition to the uterine wall and showed morphological ties suggesting metabolic interactions. SEM studies allowed us to discern 3 stages of uterine development: early - with a continuous, tubular, and branched uterus; intermediate - with bulging parts of the uterus forming uterine capsules packed with oncospheres; late - with the uterus discontinuous, breaking down into uterine capsules, either individual or connected into chains of different lengths, containing 1 to 12 oncospheres. The uterine epithelium within uterine capsules was structurally heterogeneous, closely connected with the oncospheres, constituting a common uterine envelope. Infective eggs outside the strobila were deprived of the uterine envelope, and were joined together by separate external envelopes, easily visible in the LM. Live oncospheres observed over a 24 h period after liberation from the strobila exhibited alterations in taxonomically important features, such as dimensions and shape of the external envelope. The possible roles of different envelopes are discussed.
2

Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

67%
Poddubnaya L. G., Levron C., Gibson D. I.
Acta Parasitologica
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2011
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tom 56
|
nr 2
The ultrastructure of the uterus proper of the aspidogastrean Aspidogaster limacoides Diesing, 1835 and two digenean species, Phyllodistomum angulatum Linstow, 1907 (Plagiorchiida, Gorgoderidae) and Azygia lucii (Müller, 1776) (Strigeida, Azygiidae), was examined by transmission electron microscopy (TEM). The uterine epithelial lining of these species is thin, except for the perinuclear region of the epithelial cells. Septate junctions occur between adjacent epithelial cells within the uterine wall. The luminal surface of the cells is elevated into microlamellae, which project into the uterine lumen and cover the entire epithelial lining. Basally the uterine epithelium is attached to a basal matrix, and its supporting layers of muscle fibres are weak and composed of scattered circular muscles. Despite the marked similarity in the ultrastructural pattern of the aspidogastrean and two digeneans studied, there is some degree of variation in the secretory activity of their uterine epithelium. The high level of vesicular exocytotic activity in the epithelial cytoplasm of A. lucii may be associated with differences in egg emission and the subsequent life cycle involving a non-ciliated, non-swimming and non-free-living miracidium, as opposed to the free-swimming miracidium of P. angulatum. The similar nature of the uterine epithelium in all three species studied represents an ultrastructural marker possibly supporting a close phylogenetic relationship between the Aspidogastrea and the Digenea.
3

Comparative ultrastructural studies on uterus-egg interrelations in some species of hymenolepidids [Cestoda] with aquatic life cycles

67%
Chomicz L.
Acta Parasitologica
|
1996
|
tom 41
|
nr 4
Adult specimens of four hymenolepidid species with aquatic life cycle: Microsomacanthus paracompressa (Czapliński, 1956) Spasskaya et Spasskii, 1961, Diorchis parvogenitalis (Skryabin et Matevosyan, 1945), Fimbriaria fasciolaris (Pallas, 1781) and Fimbriaria czaplinskii Grytner-Zięcina, 1994 were used to study and compare uterus-egg interrelation at the ultrastructural level (TEM and SEM). Results of the presented studies showed that in none of the species examined was the uterus merely a simple sac filled with eggs. At the final stage of development of infective eggs which was available for analysis, several tapeworms displayed significant differences in: (1) general architecture of uterus, (2) the ultrastructure of the uterine wall at the lumenal side, (3) the extent of connections between the uterine wall and the eggs, and (4) the ultrastructure of the outermost envelope surrounding the oncospheres. Details of ultrastructure of uterus-egg interrelations are presented and discussed.
4

Late stages of egg maturation in the cestode Pseudhymenolepis redonica Joyeux et Baer, 1935 [Cyclophyllidea, Hymenolepididae], a parasite of shrews

59%
Tkach V. V., Swiderski Z.
Acta Parasitologica
|
1997
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tom 42
|
nr 2
Ultrastructural characteristics of developing eggs in the late preoncospheral and oncospheral stage and that of the uterine capsules in the hymenolepidid cestode, Pseudhymenolepis redonica Joyeux et Baer, 1935, are described. The uterus in this species breaks down very early into uniovular capsules. The uterine wall consisted of a syncytial flat uterine epithelium separated from the medullary parenchyma by a thin extracellular basal matrix. The uterine epithelium contained elongated nuclei with prominent nucleoli in the juxtalumenal cytoplasm. Its apical plasma membrane was folded into long microlamellae. The differentiating and mature oncosphere were surrounded by three envelopes: (1) an outer envelope, still containing the nuclei in the preoncospheral stage; (2) an inner envelope consisting of three layers - an extraembryophoral cytoplasmic layer, a thin and discontinuous embryophore, and intraembryophoral cytoplasmic layer; (3) a thin oncospheral membrane, closely surrounding the oncosphere. The relative thickness of the extraembryophoral and intraembryophoral layers of the inner envelope was changing during egg maturation. The numerous small mitochondria which were initially present only in the intraembryophoral layer, were concentrated later in the extraembryophoral layer and in many cases were observed in the embryophoral pores. The above data may suggest that these cytoplasmic organelles are pushed through the embryophoral pores as a result of the pressure of the developing oncosphere. The oncosphere surface was covered by the cytoplasmic oncospheral tegument, basal lamina and a layer of subtegumental somatic muscles. Several cell types were distinguished in the differentiating and mature oncospheres, namely: the germinative cells; somatic cells (= myocytons of somatic and hook muscles); the bi-lobed penetration gland with its secretory granules; the “neurosecretory” cells with their characteristic dense-cored membrane-bound vesicles. Each oncosphere had three pairs of embryonic hooks: one median, one dorso-lateral and one ventro-lateral pair. The degenerating hook-forming cells or oncoblasts remained visible around the hook handles. The details of the ultrastructure of the uterine capsules, oncospheral envelopes and different cell types of differentiating and mature oncospheres of P. redonica are discussed in comparison with literature data on other hymenolepidids, parasites of mammals and birds.
5

Rozpoznanie stanów patologicznych macicy u bydła za pomocą omacywania per rectum - możliwości i ograniczenia

43%
Dejneka G. J.
Lecznica Dużych Zwierząt. Ogólnopolski Kwartalnik dla Lekarzy Weterynarii
|
2015
|
tom 10
|
nr 3
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