scholarly journals Characteristics of the uterine tubes in the fetal period: topographic and morphometric parallels

2019 ◽  
Vol 25 (2) ◽  
pp. 64-71
Author(s):  
D.V. Proniaiev ◽  
R.Ye Bulyk
Keyword(s):  
Perinatal Period ◽  
Tube Length ◽  
Histological Structure ◽  
Clinical Anatomy ◽  
Horizontal Position ◽  
Fetal Period ◽  
Uterine Tube ◽  
Operative Surgery ◽  
State Educational ◽  
The Right

Topicality of the study is stipulated by the importance of objective data for medicine concerning formation of the structure and topographic-anatomical interrelations of the uterine tubes with adjacent organs and structures during the prenatal period of human ontogenesis. Objective: to find and compare tendencies of changes of the uterine tube morphologic parameters in the two groups of fetuses remote in time, and determine age peculiarities of their topography during perinatal period of development. The experimental material (specimens of fetuses) was divided into two groups: І group – 35 specimens of fetuses deceased during 2017-2019; ІІ group – 105 specimens of fetuses taken from the Museum of the Departments of Anatomy, Clinical Anatomy and Operative Surgery at Higher State Educational Establishment of Ukraine “Bukovinian State Medical University”, collected during 1970-1990. Every group was subdivided into 7 subgroups according to 10 months of the fetal period of development (from the 4th to the 10th months). The results obtained were statistically processed in the licensed statistical package “Statistica 6.0” using nonparametric methods to evaluate the results. Regular changes in the topography of the right and left uterine tubes, changes in their shape and histological structure are observed. Both uterine tubes were found to occupy an ascending position in thirty cases out of sixty examined specimens of early fetuses (4-6 months of age). In twenty cases one uterine tube was found to be in an ascending position, and in ten cases both uterine tubes were placed practically horizontally. The study of uterine tube morphogenesis in 7-month fetuses found that the structure and topography of the uterine tubes in different age periods differ. In two 7-month fetuses the uterine tubes were found to be in an ascending position, in eight cases one uterine tube (the left one – in six cases out of eight) was in a horizontal position, and in ten cases two uterine tubes were directed practically horizontally. During the 8th month of the antenatal development one uterine tube was found to be in an ascending position out of eight cases; in ten cases both uterine tubes were in the position close to a horizontal one; and in two cases the left uterine tube was in a descending position. In 9-month fetuses both uterine tubes were found to be in a horizontal position in twelve cases, in eight cases one of the uterine tubes was in the position close to a descending one. In fourteen fetuses 10 months of development one uterine tube was in a descending position, and only in six cases both uterine tubes were located horizontally. The length of the uterine tubes of 4-7-month fetuses deceased during 2017-2019 was not found to differ reliably. Similar regularity was found in the group of fetuses aged from 9 to 10 months. The length of the uterine tubes of the archival specimens increases reliably every two months. In this group of fetuses the parameters of the uterine tube length aged from 9 to 10 months were found to differ reliably contrary to the length of the uterine tubes in the group of modern specimens of a similar age. Comparison of dynamics in changes of the uterine tube length in the two groups of fetuses remote in time showed that within the frame of one group differences in the morphometric parameters between the right and left uterine tubes are not considerable. Therefore, the study of peculiarities in the structure of the uterine tubes at every stage of the perinatal period found certain peculiarities and regularities of their development.

THE TRANSPORT OF OVA IN RELATION TO THE DOSAGE OF OESTROGEN IN OVARIECTOMIZED RABBITS

1959 ◽  
Vol 18 (1) ◽  
pp. 108-117 ◽  
Author(s):  
R. W. NOYES ◽  
C. E. ADAMS ◽  
A. WALTON
Keyword(s):  
Reproductive Tract ◽  
Great Variability ◽  
Female Reproductive Tract ◽  
The Body ◽  
Oestrogen Treatment ◽  
Uterine Tube ◽  
Ovum Transport ◽  
Oestradiol Benzoate ◽  
The Right ◽  
Egg Transport

SUMMARY In order to determine what part the level of oestrogen in the body might play in the passage of ova through the female reproductive tract, 1249 freshly ovulated ova from donor rabbits were transferred into the uterine tubes of seventy-four ovariectomized recipients, fifty-three of which had previously been treated for 5–18 days with small daily injections of oestradiol benzoate. From 10 to 78 hr after transfer, 41% of the ova were recovered from the uterine tubes, 9% from the uterine horns, and 23% from the vaginae of the recipient animals. Twenty-seven% of the ova were lost. The rate of ovum transport varied widely between similarly treated animals, and between the right and left sides of the reproductive tract of the same animal. Larger proportions of ova were retained in the uterine tubes, and smaller proportions in the uterine horns as the oestrogen dose was increased. The great variability in the stage of cleavage and in the thickness of the mucin coat of ova recovered from the uterus and vagina suggested that the ova might be widely dispersed through the uterine tubes and that they probably pass out of the uterine tube at widely different periods of time. Evidence is presented that ovum transport in ovariectomized rabbits with or without oestrogen treatment is very irregular, that ova may be ejected from either end of the uterine tube at almost any time after transfer, and that ova are not normally retained in the uteri of such animals. Approx. 1 μg oestradiol benzoate administered daily for 5–10 days was necessary to maintain the uterine weight of ovariectomized rabbits at about the same level as that in intact oestrous rabbits, and also to reduce the variability in egg transport observed in control and ovariectomized animals.

scholarly journals Studies on Amphibian Metamorphosis

1939 ◽  
Vol 16 (1) ◽  
pp. 96-120
Author(s):  
O. M. HELFF
Keyword(s):  
Great Majority ◽  
Gill Tissue ◽  
Shoulder Girdle ◽  
The Other ◽  
Histological Structure ◽  
Serial Sections ◽  
Stages Of Development ◽  
Amphibian Metamorphosis ◽  
The Right ◽  
Made In

(1) Opercular integument, homoplastically transplanted to the back and side of R. temporaria larvae, underwent a process of partial degeneration. The histolysis was not confined to any localized region of the transplant. (2) Autoplastic transplantation of opercular integument to the back and side produced a variety of results. Normal histological structure was maintained in certain transplants, generalized degeneration was observed in others, while in several instances localized histolysis resulting in perforation formation occurred. (3) Homoplastic and autoplastic transplantation of back and side skin to the opercular region resulted in histolysis and perforation formation in such transplants during larval involution. (4) The right forelimbs (in early stages of development) with attached portions of the shoulder girdle were extirpated in R. temporaria and B. bufo. During subsequent metamorphosis, normal opercular histolysis followed by perforation formation in many cases was observed. In most instances, serial sections of the peribranchial cavity revealed the absence of cutaneous glands. (5) Extirpation of the right forelimb only was made in the same two species. Opercular histolysis subsequently occurred in all instances, resulting in perforation formation in the great majority of cases during larval involution. In many of the B. bufo animals two separate perforations developed, one filled with limb stump and the other with gill tissue. (6) It is concluded that in R. temporaria a particular area of the operculum may in some individuals possess self-degenerative potentialities conducive to histolysis and perforation formation during metamorphosis. In both R. temporaria and B. bufo histolytic influences emanating from the atrophying gill tissue and the cutaneous glands of the forelimb are probably also responsible for opercular histolysis and perforation formation. Limb pressure must be considered a supplemental factor. (7) The results are discussed in general and attention called to the fact that opercular histolysis and perforation formation are "doubly assured" in some species and possibly even "triply assured" in others. Emphasis is placed on the evidently wide divergence between species as regards the particular combination of factors responsible for opercular histolysis and perforation formation. Apparently, no one explanation can serve to account for the phenomenon as it occurs in various species of anurans.

scholarly journals Políticas y prácticas en la formación de directivos escolares en Argentina. Tensiones discursivas y experienciales

2020 ◽  
Vol 28 ◽  
pp. 41
Author(s):  
Ingrid Sverdlick ◽  
Analía Motos
Keyword(s):  
Education Reform ◽  
Point Of View ◽  
Pedagogical Agents ◽  
Buenos Aires Province ◽  
Political Responsibility ◽  
School Directors ◽  
National University ◽  
Liberal Government ◽  
State Educational ◽  
The Right

The article presented for this dossier includes an analysis and reflections based on the study: “Training policies and practices for the conduction of state educational institutions at the kindergarten, primary and secondary levels”. This is a research that has been carried out since 2017 in IV Educational Region in Buenos Aires Province (corresponding to Quilmes, Berazategui and Florencio Varela districts), within the framework of the Arturo Jauretche National University, on the policies for the training of directors and their link with school conduction from a historical, political, institutional and experiential perspective. From our point of view, topics concerning school leading, in the sense of school conduction, have long been discussed and recognized as matters of great importance both at the level of school operations and in terms of the application and implementation of educational policies. During the 1990s, the concern for the conduction and administration of education in our country was expressed in a debate that was dominated by the economic tone that is characteristic of neo-liberal policies and their education reform programs. These conceptions, located within a framework of efficiency, administration, and the market, emphasized aspects associated with the ideas of management, and were highly criticized both at that time and subsequently, when educational policy was assumed to be based on the idea of a state guaranteeing the right to education. At the turn of the century (2005-2015), the focus of the issue was placed on school directors as educational conductors and pedagogical agents of institutions, emphasizing the ethical and political responsibility that the managerial function entails. Since the assumption of a new neo-liberal government (2015 and onwards), public policies guaranteeing rights, which were characteristic of the previous period, have been brutally discontinued and the ideas of neo-liberalism have been recovered, introducing some novelties, both in discursive terms, such as the emphasis on emprendedurismo (an incorrect translation of the English term “entrepreneurship”), and in relation to the forms of privatization of teacher training for school authorities with public funds. The different conceptions of the role and function of school conduction undoubtedly refer to a framework of education policy meaning, contextualized in time and space; they also involve different ways of considering the training and qualification of those who occupy or will occupy school authority positions. In this article we will present an analysis of the political and pedagogical meanings displayed at the discursive level of education and training offerings aimed to school conduction teams and also, as a counterpoint, an analytical approach to the discursive and experiential constructions of school directors in their daily realities.

scholarly journals Gonadal morphology, histology and spermatogenesis of striped piggy fish, Pomadasys stridens (Forsskal, 1775) (Family: Pomadasyidae) from Karachi coast, Pakistan.

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Amtyaz Safi
Keyword(s):  
Reproductive Biology ◽  
Sexual Maturity ◽  
Fat Body ◽  
Histological Structure ◽  
Reproductive State ◽  
Female Fish ◽  
Structure Morphology ◽  
Morphological Differences ◽  
The Right ◽  
The Relationship

A study was conducted on the histological structure, morphology of gonads and spermatogenesis of testes of the striped piggy fish, Pomadasys stridens from Karachi coast of Pakistan. The reproductive biology of grunt fishes, and the Pomadasys stridens in particular, is not well understood with respect to functional morphology and histology of the gonads in relation to sexual maturity. In the course of an investigation of the genetic variability of Pomadasys stridens, differences in morphology were observed between the right and left gonad of male and female fish and the size of the fat body associated with the gonads. Histological examinations were made to determine the relationship between these morphological differences and the reproductive state of the gonads. Findings made from this paper are gonad morphology, histology, and spermatogenesis and relate them to the reproductive biology of this species.

scholarly journals FETAL ANATOMY OF PARATHYROID GLANDS

2020 ◽  
Vol 73 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Lesia Ya. Lopushniak ◽  
Тatiana V. Khmara ◽  
Оleh М. Boichuk ◽  
Mariana A. Ryznychuk ◽  
Leonid V. Shvyhar ◽  
...  
Keyword(s):  
Jugular Vein ◽  
Age Groups ◽  
Parathyroid Glands ◽  
Brachiocephalic Vein ◽  
Human Fetuses ◽  
Crown Rump Length ◽  
Fetal Period ◽  
External Structure ◽  
Human Ontogenesis ◽  
The Right

The aim: To study the forms of anatomical variability of the external structure of the upper and lower parathyroid glands in the fetal period of human ontogenesis. Materials and methods: The study involved 48 specimens of human fetuses with 81,0-375,0 mm of crown-rump length (CRL). The study was conducted by means of macromicroscopic preparation, morphometry and variation statistics method. Results: The age and individual anatomical variability, complex way of development and formation of synotopic embryotropographic correlations of the upper and lower parathyroid glands in the prenatal period of human ontogenesis create numerous prerequisites for the emergence of variants of their external structure and topography in the fetuses of both different and the same age groups. Conclusions: There is a significant anatomical variability of the upper and lower parathyroid glands in 4-10-month-old fetuses, which is manifested by varieties of their shape and topical location. Aplasia of the upper parathyroid glands, which was found in two human fetuses aged 7 months, was due to the fetures of their organogenesis and the formation of syntopy in the embryonic and prefetal periods of their development. Parathyroid glands are mainly supplied with blood by the branches of the inferior thyroid artery. The branches of the upper thyroid artery and the arteries of adjacent organs: larynx, trachea and esophagus are involved in the blood supply. The right and left inferior thyroid veins are tributaries of the corresponding brachiocephalic vein, paired (right and left) superior and middle thyroid veins are those for the internal jugular vein.

Cardiac Helical Function

2020 ◽  
Author(s):  
Jorge Trainini ◽  
Jorge Lowenstein ◽  
Mario Beraudo ◽  
Mario Wernicke ◽  
Vicente Mora Llabata ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Initial Period ◽  
Three Dimensional ◽  
Electrical Activation ◽  
Histological Structure ◽  
Great Resistance ◽  
Diastolic Phase ◽  
The Right ◽  
Ventricular Twist ◽  
Ventricular Filling

Abstract Background. The aim of this study was to investigate: a) the starts and ends of the myocardial band; b) the slippage between the band segments, when performing both torsion and ventricular detorsion, implies that there should be an antifriction mechanism that avoids dissipating the energy; c) the electrical activation of the endocardial and epicardial bands and secondarily understand ventricular twist and the mechanism of active suction during the diastolic isovolumic phase. Methods. They were used: a) Ten young-bovine hearts (800-1000 g) and seven human hearts (one embrión, 4 g; one 10 years, 250 g and five adult, 300 g/average); b) five patients with no structural cardiac abnormalities and normal QRS complexes underwent three-dimensional endoepicardial electroanatomic mapping. Results. We have found in all the bovine and human hearts studied a nucleus (fulcrum) underlying the right trigone, whose osseus, chondroid or tendinous histological structure depends on the specimen analyzed. All the hearts studied presented myocardial attachment to the rigid structure of the fulcrum. Hyaluronic acid was found in the cleavage planes between the myocardial bundles.Endo-epicardial mapping demonstrates an electrical activation sequence in the area of the apex loop in agreement with the synchronic contraction of the descending and ascending band segments, consistent with the mechanism of ventricular twist. The late activation of the ascending band segment is consistent with its persistent contraction during the initial period of the isovolumic diastolic phase (the basis of the suction mechanism). Conclusions. The finding of the fulcrum gives support to the spiral myocardial band being the point of fixation that allows the helicoidal torsion. The hyaluronic acid would act as a lubricant and provide great resistance to mechanical pressures. This study explains the ventricular twist and the active suction mechanism during the isovolumic diastolic and early ventricular filling phases.Trial. This work does not correspond to a trial

Hanna Yablonka, Yeladim beseder gamur: biyografiyah dorit shel yelidei haaretz 1948–1955 (Children by the Book, Biography of a Generation: The First Native Israelis Born 1948–1955). Rishon Letziyon: Miskal, 2018. 430 pp.

2021 ◽  
pp. 310-312
Keyword(s):  
Educational System ◽  
Historical Consciousness ◽  
The State ◽  
Historical Experience ◽  
One Dimensional ◽  
The People ◽  
Native Identity ◽  
The One ◽  
State Educational ◽  
The Right

This chapter examines Hanna Yablonka's Children by the Book, Biography of a Generation: The First Native Israelis Born 1948–1955 (2018). This book is unique in that it is neither politically committed to nationalist political slogans that are thrown daily into the arena of Israeli politics in the days of Netanyahu nor connected to the one-dimensional, sweeping condemnation of critics of the Israeli enterprise on the Right and Left. Instead, it suggests to set aside, even if only for a moment, what Yablonka calls “the current Israeli discourse, which furiously shatters everything that has happened in the state since it was established, brutally erasing all the achievements of Little Israel.” Yabonka is guided by Karl Mannheim's concept of a “historical generation”: a group in which there is a shared historical consciousness derived from historical experience. She shows how the state educational system fashioned the image of the new Israeli, endowing children with a local, native identity and imbuing them with the consciousness of belonging both to the people and to the land.

Age-related histomorphological studies on the spleen of Chinese yellow quail

2018 ◽  
Author(s):  
Zhao Piao ◽  
He Min ◽  
Yingying Lv ◽  
Jingjing Wei ◽  
Mingyan He ◽  
...  
Keyword(s):  
Basic Structure ◽  
Developmental Period ◽  
Histological Structure ◽  
White Pulp ◽  
Maturation Period ◽  
Average Area ◽  
Age Related ◽  
Significant Difference ◽  
The Right ◽  
Red Pulp

This study was aimed to investigate the morphology, growth, histological structure and development of the spleen of the Chinese yellow quail at different ages(from 0 to 38 weeks). The yellow Quail spleen was spherical, brownish red, located at the right dorsal of the junction of the muscle stomach and glandular stomach. The absolute quality, length and width of the spleen gradually increased with age, reaching a maximum for each of these measurements at the age of 6 weeks and then remainied unchanged between 10 and 26 weeks of age. Finally, these measurements of the spleen were no significant difference at 30 weeks of age compared to at 34 to 38 weeks (P>0.05). Although, these measurements were found to gradually decrease during 30-38 weeks of age, the decrease was not obvious. The basic structure of the spleen included red pulp, white pulp and the edge area. In addition, the average area and diameter of the splenic nodules, the white pulp ellipsoid and the periarterial lymphatic sheath gradually increased, reaching maximum sizes at the age of 26 weeks. It was seen that a sustained developmental period occurred at 0-6 weeks of age and a maturation period occurred at 10-38 weeks during the development of quail spleen.

On a New Type of Vibrating Lift

1980 ◽  
Vol 102 (2) ◽  
pp. 264-269
Author(s):  
J. Inoue ◽  
Y. Araki ◽  
S. Kubo
Keyword(s):  
The Self ◽  
The Other ◽  
Vertical Position ◽  
Horizontal Position ◽  
Linear Vibration ◽  
Left Hand ◽  
Asynchronous Motors ◽  
Rotational Vibration ◽  
New Type ◽  
The Right

This paper investigates in detail the new vibrating lift made by utilizing the principle of the self-synchronization of mechanical vibrators. In a general way products ride up inclined way of the spiral trough of a vibrating lift, propelled by forces generated by two unbalanced rotors connected by the gear and driven by a motor, which are mounted on top of the structure in a horizontal position. This machine is a new type of vibrating lift. The axes of two unbalanced rotors are nonparallel and each driven by two asynchronous motors. One motor is positioned on the right hand side and the other is situated on the left hand side of the structure in a vertical position. In spite of the absence of any connection between two rotors, they rotate at the same speed and have the definite phase angle between them as the result of the phenomena of the self-synchronization under a certain condition. This phenomenon is also called entrainment. Accordingly, by the linear vibration in the direction of the axis of the structure and rotational vibration about the axis of the structure by two unbalanced rotors, products ride up inclined way of the spiral trough.

scholarly journals Morpho-histological comparative study of the liver in White-eared bulbul (Pycnonotus leucotis), Mallard duck (Anas platyrhynchos), and Gull (Larus canus)

2018 ◽  
Vol 41 (2) ◽  
pp. 94-99
Author(s):  
Khalid Ibrahim Abd Al-Khazraji
Keyword(s):  
Food Environment ◽  
Left Lobe ◽  
Histological Structure ◽  
Central Vein ◽  
Mallard Duck ◽  
Hepatic Parenchyma ◽  
Anatomical Features ◽  
Right Lobe ◽  
Hepatic Portal ◽  
The Right

     This study was conducted to compare some of anatomical features and histological structure of the liver in three species of birds that varied in their size, taxonomy, and food environment. The study revealed that the liver in the mallard, gull and white-eared bulbul was bilobed big gland, and the left lobe was smaller than the right one. It was observed that the two lobes in mallard were undivided, while the right lobe in gull has two parts, whereas the left lobe in white-eared bulbul is subdivided into two parts. Histologically, the liver capsule in gull appeared thicker than other two species. The hepatic parenchyma was not shown to be clearly defined lobules in three species. The hepatocytes were organized radially around the central vein as plates or cords of one-two cell thick in mallard and gull, and of two-several cell thick in white-eared bulbul, and those plates were separated by blood sinusoids. It turned out that the hepatic portal triads were less numerous in white-eared bulbul compared with other two species. It was found that there are differences in measurements of some histological structures of the liver among the three species.

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