The ultrastructure of the scolex tegument, bothridial pits (“ciliated pits) and rhyncheal system of Otobothrium mugilis Hiscock, 1954 is described from plerocerci collected from the teleosts Arius graeffei Kncr ct Steindachner and Mugil cephalus Linnaeus. Scanning electron microscopy revealed that filamentous microtriches with shortened caps are abundant across the entire surface of the tegument. Palmate microtriches are dominant on the bothridia and their margins. The surfaces of bothridial pits were covered with large bifid microtrichcs. The bothridial pits arc strongly muscularised invaginations of the tegument. Nervous tissues were not observed within the pits and it is probable that these structures function as accessory attachment structures. The wall of each tentacle sheath consists of one to three bands of fibrils, lined internally by a thin cytoplasmic layer. The tentacular walls are cellular, containing myofilaments. The fibrils of the tentacular walls are arranged into discrete blocks of parallel fibrils and appear to be intracellular. Tentacular walls are lined externally by a modified membrane with an external glycocalyx. Tentacular hooks arc solid, bound externally by a membrane. The body of the hook contains numerous longitudinal canaliculi and an elcctron-opaquc medulla lies at the centre of the hook.
The secondary osmoregulatory canals in the scolex and neck region of Silurotaenia siluri, a parasite of the catfish Silurus glanis (L.), terminate below the tegument basal plasma membrane. The basal plasma membrane of the osmoregulatory canal syncytium is in tight contact with the tegument basal plasma membrane.
The present study describes the ultrastructure of the mature spermatozoon of Lecithocladium excisum (Rudolphi, 1819) (Digenea: Hemiuroidea: Hemiuridae) from the stomach of the marine teleost Scomber japonicus Houttuyn (Scombridae) captured in the Atlantic Ocean, off Dakar (Senegal). The ultrastructural organization of the spermatozoon of L. excisum follows the general model described in most digeneans. It presents two axonemes of the 9+'1' pattern of the Trepaxonemata, nucleus, mitochondrion and parallel cortical microtubules, among other characters. However, some particularities of the spermatozoon of L. excisum are (i) the presence of a membranous ornamentation not associated with cortical microtubules in its anterior extremity, (ii) the presence of a very reduced number of cortical microtubules located only in the ventral side of the spermatozoon and (iii) the absence of several structures described in most digeneans such as spine-like bodies and cytoplasmic expansions.
In the present paper, we describe the ultrastructure of the spermatozoon of the notocotylid Notocotylus noyeri (Joyeux, 1922) by means of transmission electron microscopy. The mature spermatozoon of N. noyeri exhibits the general pattern described in the majority of digeneans: two axonemes of the 9 + "1" pattern of the Trepaxonemata, nucleus, mitochondria, parallel cortical microtubules, spine-like bodies and ornamentation of the plasma membrane. The glycogenic nature of the electron-dense granules was evidenced applying the test of Thiéry. The ultrastructural features of the spermatozoon of N. noyeri present some differences in relation to those of the Pronocephalidea described until now, but confirm a general pattern for the Notocotylidae, namely a spermatozoon with two mitochondria and an anterior region with ornamentation of the plasma membrane associated with spine-like bodies. The posterior extremity of the spermatozoon exhibits only some microtubules after the disorganisation of the second axoneme. The present study confirms that some ultrastructural characters of the sperm cell such as the presence or absence of lateral expansions, the number of mitochondria and the morphology of both anterior and posterior spermatozoon extremities are useful for phylogenetic purposes within the Pronocephaloidea. Thus, unlike notocotylids, pronocephalids exhibit external ornamentation and a lateral expansion in the anterior spermatozoon region. Moreover, notocotylid spermatozoa present two mitochondria, whereas pronocephalid spermatozoa exhibit a single mitochondrion. Finally, pronocephalids are characterised by a type 2 posterior spermatozoon extremity, whereas notocotylids exhibit a type 3 posterior spermatozoon extremity., Papa Ibnou Ndiaye, Jordi Torres, Catarina Eira, Vladimir V. Shimalov, Jordi Miquel., and Obsahuje bibliografii
The surface structures and gland cells of the posterior rosette organ of Gyrocotyle urna Grube et Wagener, 1852, a member of the group presumed to be the most basal of the tapeworms (Cestoda: Gyrocotylidea), was studied by scanning electron and transmission electron microscopy. Surface structures on the outer (oriented away from the intestinal wall) and inner (in contact with the intestinal wall) rosette surfaces differ from each other and represent a transitional form between microvilli and microtriches typical of tapeworms (Eucestoda). The inner surface of the rosette possesses numerous glands. On the basis of the size and electron-density of their secretory granules, three types of unicellular gland cells can be distinguished. The least common type (Type I) is characterized by the production of small, round, electron-dense granules of about 0.3 µm in diameter, whereas another type of secretion (Type II) is formed from homogenous, moderately electron-dense, spheroidal granules of about 0.7 µm in diameter. The most common type of glands (Type III) is recognized by a secretion comprising large, elongate, electron-dense granules of about 1 µm long and 0.5 µm broad. The secretory granules of the three types of the glands are liberated by an eccrine mechanism and the gland ducts open via small pores on the inner rosette surface. The complex of secretory glands of the posterior rosette of G. urna is similar to those in the anterior attachment glands of monogeneans (as opposed to the types of glands present in other helminth groups). However, the tegumental surface structures of Gyrocotyle are supporting evidence for the relationship between the Gyrocotylidea and Eucestoda.
The ultrastructure of three types of unicellular scolex gland cells in adult cestode Bothriocephalus claviceps (Goeze, 1782) is described. The first type - apocrine gland cells transport their secretion (small rounded electron dense granules) via thin ducts into the tegument where it accumulates as projections on the body surface. The second type - eccrine gland cells press out their secretion (large oval electron dense granules) through ducts which open to the exterior surface of the tegument. The third type - microapocrine gland cells transport their secretion (large rounded electron dense granules) through thin cytoplasmic processes into the distal cytoplasm of the tegument. The secretory discharge occurs by means of évaginations of the outer tegumental plasmalemma and their subsequent detachment. The possible functions of the scolex gland cells are discussed.
This review critically examines the ecological costs and benefits of ultraviolet vision in European owlflies. On the one hand it permits the accurate pursuit of flying prey, but on the other, it limits hunting to sunny periods. First the physics of detecting short wave radiation are presented. Then the advantages and disadvantages of the optical specializations necessary for UV vision are discussed. Finally the question of why several visual pigments are involved in UV vision is addressed.
Ultrazvukové vyšetrenie maternice po pôrode zahŕňa niektoré špecifiká, ktoré vyplývajú z rýchlo sa meniacich rozmerov maternice, ale aj compliance pacientky vo včasnom šestonedelí. Pri riešení popôrodných komplikácií je potrebné poznať normálny ultrazvukový nález, dynamické zmeny maternice v priebehu šestonedelia, aby sme vedeli lepšie rozpoznať patologický priebeh od normálneho priebehu šestonedelia. Klinický význam ultrazvukového posúdenia veľkosti maternice ako aj oblasti jazvy po cisárskom reze v priebehu šestonedelia doteraz nie je dostatočne popísaný. Prehľadový článok rozoberá špecifiká ultrazvukovej diagnostiky po vaginálnom pôrode a cisárskom reze. Autori článku prezentujú jednoduchú techniku vyšetrenia maternice po pôrode., Ultrasound examination of the uterus after delivery includes some features which result from rapidly changing dimensions of the uterus, but also patient compliance in the early puerperium. In dealing with postpartum complications is necessary to know the normal ultrasound findings, the dynamic changes in the uterus during the puerperium, so we can better recognize the pathological process during the normal puerperium. The clinical significance of ultrasound assessment of uterine size and the scar after Cesarean section during the puerperium have not been yet sufficiently described. Review article discusses the specifics of diagnostic ultrasound following vaginal delivery and Cesarean section. Authors of the article presents a simple technique of the uterus examination after childbirth., Erik Dosedla, Pavel Calda, and Literatura 42
Hyperechogenní a rozšířená oblast substantia nigra je detekovatelná u více než 90 % pacientů s Parkinsonovou nemocí (PN). U zdravé populace se však tento nález vyskytuje maximálně v 10 %. Cílem naším práce bylo zjistit zastoupení nálezu hyperechogenní či rozšířené substantia nigra u pacientů s atypickým parkinsonským syndromem (APS). Metodika: Během 15 měsíců jsme vyšetřili pomocí transkraniální sonografie 209 pacientů s PN, multisystémovou atrofií (MSA), vaskulárním parkinsonským syndromem (VP) a esenciálním tremorem (ET). Jako kontrolní skupina byli vybráni pacienti s prokázanou PN a zdraví dobrovolníci. Výsledky: Hyperechogenní SN byla nalezena u 42,9 % u pacientů s MSA, 10 % u ET, a 18,2 % u VP. Rozšířená oblast SN větší než 0,25 cm2 byla detekována u pacientů s MSA v 50 %, u VP ve 20 % a u ET ve 27,3 %. Hyperechogenní, rozšířená SN byla signifikantně častější u PN (84,7 %) a MSA (50 %) (p > 0,05) ve srovnání s VP (27,3 %), ET (20 %) a zdravými dobrovolníky (0 %). Závěr: Nález hyperechogenní, rozšířená oblast SN je signifikantně častější u pacientů s PN a MSA. TCS detekce SN může být použita jako další metoda v diferenciální diagnostice PN a atypických parkinsonských syndromů., Petra Bártová, D. Školoudík, T. Fadrná, P. Ressner, M. Bar, R. Herzig, P. Kaňovský, and Lit.: 18
Cíl. Korelace ultrazvukového vyšetření polohy disku temporomandibulárního kloubu s vyšetřením na magnetické rezonanci. Metoda. Celkem bylo vyšetřeno 95 pacientů, 112 čelistních kloubů, soubor zahrnoval 10 mužů, 85 žen, věkové rozhraní 14-74 let, průměrný věk 37 let. Vyšetření na ultrazvuku probíhalo na přístroji Philips iu22 lineární 17 MHz sondou ve dvou fázích - klidové a dynamické - při otevírání úst. Na magnetické rezonanci byli pacienti vyšetření na přístroji Philips Achieva 1,5 T s povrchovou cívkou a mikroskopickou cívkou, každé vyšetření zahrnovalo sekvenci s postupným otevíráním úst. Výsledky. Souhlas mezi ultrazvukovým vyšetřením a magnetickou rezonancí při ventrální poloze byl 96%, z toho byla diagnostikována repozice disku v 94%, u pacientů bez repozice byla senzitivita nižší - 65%., Aim. The aim of this study was the correlation of an ultrasound examination of the disk of the temporomandibular joint with the magnetic rezonance examination. Method. In total has been examined 95 patients, 112 mandibular joints, file include 10 men, 85 women, age interface 14-74 years old, the average age of 37 years. The patients were examined using Philips iu22 with linear 17 MHz probe with dynamic phase - with opening the mouth. On the MRI, the patients were examined using Philips Achieva 1.5 T with the surface coil and microscopic coil, each examination included a sequence with the gradual opening of the mouth. Results. Consent between the ultrasound examination and magnetic resonance imaging in the anterior position was 96%, disc reposition in 94% of patients, without reposition in 65% cases., Andrea Šprláková-Puková, Alena Štouračová, Miloš Keřkovský, Ondřej Liberda, Vojtěch Peřina, Karel Bartušek, Zdenek Smékal, Ondřej Šmirg, and Literatura