Anatomia Histologia Embryologia最新文献

Amazona aestiva, a member of the Psittacidae family, belongs to the genus Amazona. These animals are endowed with adaptations in their digestive systems that allow a natural diet composed of seeds and fruits, with anatomical characteristics that facilitate the acquisition and use of nutrients from these food groups. Although it is an important species, no previous information is available regarding the histology and histochemistry of its digestive tract. This study aimed to describe the morphological and histochemical characteristics of the digestive tract of this species. Fragments of the tongue, oesophagus, crop, proventriculus, ventriculus, small intestine, large intestine, liver and pancreas were collected from seven specimens without any clinical alterations in the digestive tract. A. aestiva's digestive tract observed the presence of an extremely developed tongue, a proventriculus with more delicate walls and a ventricle with less-developed musculature. Here, we present a detailed morphological and histochemical description of the Turquoise-fronted Parrot's digestive tract.

The Arabian goby, Cryptocentroides arabicus (Gobiidae: Gobiinae), is a significant species in marine and brackish water ecosystems. However, limited information is available about the reproductive biology and the early life history of this species. This study aimed to understand the embryonic and pre-larval development of C. arabicus under controlled laboratory conditions using light microscopy. Ten fish pairs were placed in five 70-L glass aquaria, and environmental parameters were carefully monitored. After 4 months, spawning began, with each event yielding between 700 and 1500 eggs, totaling 10 spawning events. The elliptical-shaped eggs, measuring 3.9 ± 0.1 mm in length and 1.6 mm in maximum width, hatched after 7 days and 4 h at a water temperature of 28°C. This process resulted in the identification of eight distinct larval developmental stages. Parental care by both the male and female was observed during the incubation period. Documenting the morphological changes during incubation contributes to a better understanding of the reproductive behaviour and early life history of C. arabicus. This is essential for the conservation management of marine and brackish water environments.

Morphological studies concerning salivary glands have emerged as an exciting tool to understand feeding habits. In this sense, this study aimed to describe capybara salivary glands morphology to understand potential morphological associations to this species feeding habits. Macroscopic dissections and microscopic analyses were performed on eight specimens. The findings indicate that capybaras have three pairs of major (parotid, mandibular and sublingual) and two pairs of minors (dorsal and ventral buccal) salivary glands. The parotid gland, the largest, is irregularly shaped, forming small macroscopic lobes. The mandibular gland is rounded and found syntopically alongside the mandible angle and arranged medially to the ventral projection of the parotid gland. The sublingual gland is a compact elongated and semicircular mass. The dorsal and ventral buccal glands are located in the buccal portion of the buccinator muscle. Histologically, the parotid and mandibular glands are composed of serous acini, while the sublingual and buccal (dorsal and ventral) glands consist of mucous tubules containing serous demi-lunes at their periphery. Capybara salivary glands reveal morphological associations with a predominantly herbivorous diet. The parotid gland, for example, notably developed in size and volume, suggests a specialisation for increased saliva production, necessary for chewing, forming the food bolus, swallowing fibrous foods, and protecting the oral cavity ecosystem.

Dorset sheep (Ovis aries) are common models in translational cardiovascular research due to physiologic and anatomic similarities to humans. While employing ovine subjects to study single-ventricle physiology, we repeatedly observed position-based changes in central venous pressure (CVP) which could not be explained by hydrostatic (gravitational) effects. Inferior vena cava (IVC) narrowing or compression has been demonstrated in numerous species, and we hypothesised that this phenomenon might explain our observations in O. aries. This study aimed to characterise position-dependent morphology of the IVC in O. aries using catheter-based hemodynamic and dimensional measurements, three-dimensional MRI reconstruction and histological analysis. Baseline measurements revealed a significant reduction in IVC dimensions at the level of the diaphragm (dVC) compared to the abdominal vena cava (aVC) and thoracic vena cava (tVC). We also observed a transdiaphragmatic pressure gradient along the IVC, with higher pressures in the aVC compared to the tVC. We found that variation of position and fluid status altered IVC haemodynamics. Histological data showed variable muscularity along the length of the IVC, with greater smooth muscle content in the aVC than the tVC. These findings will improve understanding of baseline ovine physiology, help refine experimental protocols and facilitate the translation of findings to the clinic.

In vitro maturation (IVM) of immature oocytes is a valuable method to enhance the rate of mature oocytes available for fertilisation. In the current study, platelet-rich plasma (PRP) was employed in IVM medium of immature oocytes. Harvested germinal vesicle stage oocytes with cumulus cells from female mature BALB/c mice divided into two groups of control and experiment. In the experimental group, GV oocytes matured in the IVM medium supplemented with 5% PRP, while in the control group, GV oocytes matured in the IVM medium without PRP. The percentage of GV, MI, MII and degenerated oocytes, zona pellucida thickness, perivitelline space size, diameter of mature oocytes, gene expression of apoptosis-related factors and subsequent development of matured oocytes were assessed. The PRP group displayed significantly improved outcomes in various parameters, including a higher proportion of MII and fertilised oocytes, cleavage and blastocyst embryos, compared to the control group. Moreover, the thickness of the zona pellucida was significantly lower in the PRP group than in the control group (p < 0.05). Furthermore, the PRP group demonstrated a significant decrease in the expression of transcripts associated with apoptosis (Bax and caspase-3); however, in the PRP group, a substantial increase in the expression of Bcl2l1, an apoptosis inhibitor, was observed when compared to the control group (p < 0.05). In conclusion, addition of PRP to the IVM culture media significantly increased oocyte maturation rate, leading to improved fertilisation and subsequent embryonic development. This enhancement highlights the positive influence of PRP on overall in vitro maturation efficiency and early embryonic stages.

Given the high prevalence of skeletal and mandibular diseases in the Patagonian Huemul, comprehensive anatomical studies are essential to understand the impact of nutritional deficiencies and support conservation efforts. The aim of this study is to provide a detailed anatomical characterisation of three exhumed mandibles of Patagonian huemul (Hippocamelus bisulcus) through three-dimensional reconstructions obtained from computed tomography data and semi-automatic segmentation, documenting their distinctive features. The findings revealed distinctive features in the mandible, consistent with the browsing habits of herbivores, such as a robust coronoid process, a wide and deep pterygoid fossa, a significantly lower mandibular condyle compared to other deer species and a unique configuration of the mandibular canal with a curved caudal portion and a straight rostral portion. These anatomical adaptations are likely related to the species' feeding habits and behaviour. The study also addressed the challenges of researching an endangered species, given that access to biological material is restricted by strict regulations in Chile and Argentina. These restrictions limited the available sample size and hindered the acquisition of additional specimens, which could affect the generalisation of the results. Despite these limitations, the research provides valuable anatomical insights that are fundamental for the biology, clinical practice and management of specimens. In conclusion, the mandibles of both juvenile and adult Patagonian huemul demonstrate distinctive features characteristic of browsing herbivores. The findings can serve as a basis for future comparative studies on mandibular anatomy and function in this endangered deer species as well as in other herbivorous deer.

This study aimed to evaluate the spinal morphometry of the thoracic and lumbar regions in normal Korean Shorthair cats using computed tomography (CT) and to investigate the relationship with variables such as sex, age and body weight. Fifteen clinically healthy Korean Shorthair cats (eight males, seven females) from Seoul National University Veterinary Medical Teaching Hospital were included in this retrospective study. Measurements of the height, width and area of the vertebral canal and spinal cord on CT images were taken at the cranial, middle and caudal points of the thoracic and lumbar vertebrae by three observers, and the ratios of the spinal cord area to the vertebral canal area were calculated. The significance of the differences in measurements between sexes and correlations with age and body weight were analysed. The mean age of the cats was 7 years (range: 2–12 years), with a mean weight of 5.27 kg (range: 2.6–8.3 kg). The height, width and area of the vertebral canal and spinal cord were significantly greater in males than in females (p < 0.05). The ratios of the spinal cord area to the vertebral canal area showed no significant difference between sexes (p > 0.05), and no significant correlations were found between the ratios of the spinal cord area to the vertebral canal area and age or body weight. This study provides useful reference intervals for spinal morphometry in the thoracic and lumbar regions of healthy Korean Shorthair cats and investigate the relationship with variables such as sex, age and body weight. This anatomical information may assist in the diagnosis and prognosis of thoracic, lumbar vertebral and spinal cord diseases using CT.

The thymus, a primary lymphoid organ, plays a critical role in T lymphocyte development and adaptive immunity. This study focuses on the anatomical, histological and geometric morphometric characteristics of the thymus in dromedary camels (Camelus dromedarius) during postnatal development. Thymus samples were collected from camels aged approximately 4, 8, 12 and 16 months. Using photogrammetry and 3D modelling, the samples were analysed to generate landmarks and conduct geometric morphometry with the 3D Slicer and ALPACA algorithm. Principal component analysis (PCA) was then performed to evaluate shape variations. Histologically, the samples underwent Haematoxylin and Eosin and Masson's trichrome staining. Image analysis using QuPath software quantified trabeculae, adipose tissue and Hassall's corpuscles. The results revealed significant anatomical and histological changes in the thymus across the different age groups. Notable variations in tissue composition and structural integrity were observed, with the PCA highlighting distinct morphometric patterns associated with age-related development. These findings provide a deeper understanding of thymus maturation in dromedaries and offer valuable data for comparative anatomy and veterinary medicine. This comprehensive analysis enhances our knowledge of species-specific immune development, with important implications for the health and resilience of these animals in arid environments.