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Surgical Pathology Clinics Dec 2019Proliferative pathologic lesions of parathyroid glands encompass a spectrum of entities ranging from benign hyperplastic processes to malignant neoplasia. This review... (Review)
Review
Proliferative pathologic lesions of parathyroid glands encompass a spectrum of entities ranging from benign hyperplastic processes to malignant neoplasia. This review article outlines the pathophysiologic classification of parathyroid disorders and describes histologic, immunohistochemical, and molecular features that can be assessed to render accurate diagnoses.
Topics: Adenoma; Humans; Hyperparathyroidism; Immunohistochemistry; Parathyroid Glands; Parathyroid Neoplasms
PubMed: 31672291
DOI: 10.1016/j.path.2019.08.006 -
Advances in Physiology Education Jun 2018The purpose of this study is to see whether a large drawing of a nephron helped medical students in self-directed learning groups learn renal physiology, histology, and...
The purpose of this study is to see whether a large drawing of a nephron helped medical students in self-directed learning groups learn renal physiology, histology, and pharmacology before discussing clinical cases. The end points were the grades on the renal examination and a student survey. The classes in the fall of 2014 and 2015 used the drawing, but not those of 2012 and 2013. The Charles E. Schmidt College of Medicine at Florida Atlantic University is a newly formed Florida medical school, which enrolled its first class in the fall of 2011. The school relies on self-directed problem-based learning in year 1 and changes over to a case inquiry method in the latter part of year 1 and throughout year 2. At the start of the renal course, each student group received a poster of a nephron with the objective of learning the cell functions of the different nephron parts. During the first year of using the drawing, there was no improvement in grades. After a student suggested adjustment to the drawing, there was a statistically significant difference in the total test score in the second year ( P < 0.001). An unexpected finding was lower grades in all 4 yr in the area of acid-base balance and electrolytes compared with the other four areas tested. In the survey, the students found the drawing useful.
Topics: Education, Medical; Educational Measurement; Female; Histology; Humans; Kidney; Male; Nephrons; Pharmacology; Physiology; Problem-Based Learning; Retrospective Studies; Students, Medical; Teaching; Young Adult
PubMed: 29616568
DOI: 10.1152/advan.00022.2017 -
Journal of Anatomy Dec 2013Although the plantar fascia (PF) has been studied quite well from a biomechanical viewpoint, its microscopic properties have been overlooked: nothing is known about its...
Although the plantar fascia (PF) has been studied quite well from a biomechanical viewpoint, its microscopic properties have been overlooked: nothing is known about its content of elastic fibers, the features of the extracellular matrix or the extent of innervation. From a functional and clinical standpoint, the PF is often correlated with the triceps surae muscle, but the anatomical grounds for this link are not clear. The aim of this work was to focus on the PF macroscopic and microscopic properties and study how Achilles tendon diseases might affect it. Twelve feet from unembalmed human cadavers were dissected to isolate the PF. Specimens from each PF were tested with various histological and immunohistochemical stains. In a second stage, 52 magnetic resonance images (MRI) obtained from patients complaining of aspecific ankle or foot pain were analyzed, dividing the cases into two groups based on the presence or absence of signs of degeneration and/or inflammation of the Achilles tendon. The thickness of PF and paratenon was assessed in the two groups and statistical analyses were conducted. The PF is a tissue firmly joined to plantar muscles and skin. Analyzing its possible connections to the sural structures showed that this fascia is more closely connected to the paratenon of Achilles tendon than to the Achilles tendon, through the periosteum of the heel. The PF extended medially and laterally, continuing into the deep fasciae enveloping the abductor hallucis and abductor digiti minimi muscles, respectively. The PF was rich in hyaluronan, probably produced by fibroblastic-like cells described as 'fasciacytes'. Nerve endings and Pacini and Ruffini corpuscles were present, particularly in the medial and lateral portions, and on the surface of the muscles, suggesting a role for the PF in the proprioception of foot. In the radiological study, 27 of the 52 MRI showed signs of Achilles tendon inflammation and/or degeneration, and the PF was 3.43 ± 0.48 mm thick (99%CI and SD = 0.95), as opposed to 2.09 ± 0.24 mm (99%CI, SD = 0.47) in the patients in which the MRI revealed no Achilles tendon diseases; this difference in thickness of 1.29 ± 0.57 mm (99%CI) was statistically significant (P < 0.001). In the group of 27/52 patients with tendinopathies, the PF was more than 4.5 mm thick in 5, i.e. they exceeded the threshold for a diagnosis of plantar fasciitis. None of the other 25/52 paitents had a PF more than 4 mm thick. There was a statistically significant correlation between the thicknesses of the PF and the paratenon. These findings suggest that the plantar fascia has a role not only in supporting the longitudinal arch of the foot, but also in its proprioception and peripheral motor coordination. Its relationship with the paratenon of the Achilles tendon is consistent with the idea of triceps surae structures being involved in the PF pathology, so their rehabilitation can be considered appropriate. Finally, the high concentration of hyaluronan in the PF points to the feasibility of using hyaluronan injections in the fascia to treat plantar fasciitis.
Topics: Achilles Tendon; Aged; Aged, 80 and over; Cadaver; Fascia; Female; Foot; Humans; Immunohistochemistry; Magnetic Resonance Imaging; Male; Tendinopathy
PubMed: 24028383
DOI: 10.1111/joa.12111 -
Bosnian Journal of Basic Medical... Feb 2016Despite substantial similarities in embryological, cellular and molecular biology features, human and mouse prostates differ in organ morphology and tissue architecture.... (Review)
Review
Despite substantial similarities in embryological, cellular and molecular biology features, human and mouse prostates differ in organ morphology and tissue architecture. Thus, a clear understanding of the anatomy and histology of the mouse prostate is essential for the identification of urogenital phenotypes in genetically engineered mice, as well as for the study of the etiology, development, and treatment of human prostatic diseases for which mouse models are used. The purpose of this manuscript is to provide a brief guide for the dissection of the mouse prostate and the identification of its different lobes and histology, to both basic researchers and medical pathologists who are unfamiliar with mouse tissues.
Topics: Animals; Disease Models, Animal; Dogs; Eosine Yellowish-(YS); Hematoxylin; Histology; Humans; Male; Mice; Models, Animal; Phenotype; Prostate; Rats; Species Specificity
PubMed: 26773172
DOI: 10.17305/bjbms.2016.917 -
Scientific Reports Feb 2021There are countless morphological variations among the muscles, tendons, ligaments, arteries, veins and nerves of the human body, many of which remain undescribed....
There are countless morphological variations among the muscles, tendons, ligaments, arteries, veins and nerves of the human body, many of which remain undescribed. Anatomical structures are also subject to evolution, many disappearing and others continually emerging. The main goal of this pilot study was to describe a previously undetected anatomical structure, the plantaris ligamentous tendon, and to determine its frequency and histology. Twenty-two lower limbs from 11 adult cadavers (11 left, and 11 right) fixed in 10% formalin were examined. The mean age of the cadavers at death was 60.1 years (range 38-85). The group comprised six women and five men from a Central European population. All anatomical dissections of the leg and foot area accorded with the pre-established protocol. Among the 22 lower limbs, the PLT was present in 16 (72.7%) and absent in six (27.3%). It originated as a strong fan-shaped ligamentous tendon from the superior part of the plantaris muscle, the posterior surface of the femur and the lateral aspect of the knee joint capsule. It inserted to the ilio-tibial band. Histologically, a tendon and ligament were observed extending parallel to each other. A new anatomical structure has been found, for which the name plantaris ligamentous tendon is proposed. It occurs around the popliteal region between the plantaris muscle, the posterior surface of the femur, and the ilio-tibial band.
Topics: Adult; Aged; Aged, 80 and over; Cadaver; Histocytochemistry; Humans; Middle Aged; Muscle, Skeletal; Patellar Ligament; Tendons
PubMed: 33633305
DOI: 10.1038/s41598-021-84186-w -
The Anatomical Record Feb 2002We have been experimenting with the use of animations to teach histology as part of an interactive multimedia program we are developing to replace the traditional... (Review)
Review
We have been experimenting with the use of animations to teach histology as part of an interactive multimedia program we are developing to replace the traditional lecture/laboratory-based histology course in our medical and dental curricula. This program, called HistoQuest, uses animations to illustrate basic histologic principles, explain dynamic processes, integrate histologic structure with physiological function, and assist students in forming mental models with which to organize and integrate new information into their learning. With this article, we first briefly discuss the theory of mental modeling, principles of visual presentation, and how mental modeling and visual presentation can be integrated to create effective animations. We then discuss the major Web-based animation technologies that are currently available and their suitability for different visual styles and navigational structures. Finally, we describe the process we use to produce animations for our program. The approach described in this study can be used by other developers to create animations for delivery over the Internet for the teaching of histology.
Topics: Animals; Computer Graphics; Computer-Assisted Instruction; Education, Medical, Undergraduate; Histology; Humans; Imaging, Three-Dimensional; Internet; Models, Educational; Software
PubMed: 11891621
DOI: 10.1002/ar.10054 -
Development (Cambridge, England) Feb 2021The size, shape and insertion sites of muscles enable them to carry out their precise functions in moving and supporting the skeleton. Although forelimb anatomy is well...
The size, shape and insertion sites of muscles enable them to carry out their precise functions in moving and supporting the skeleton. Although forelimb anatomy is well described, much less is known about the embryonic events that ensure individual muscles reach their mature form. A description of human forelimb muscle development is needed to understand the events that control normal muscle formation and to identify what events are disrupted in congenital abnormalities in which muscles fail to form normally. We provide a new, 4D anatomical characterisation of the developing human upper limb muscles between Carnegie stages 18 and 22 using optical projection tomography. We show that muscles develop in a progressive wave, from proximal to distal and from superficial to deep. We show that some muscle bundles undergo splitting events to form individual muscles, whereas others translocate to reach their correct position within the forelimb. Finally, we show that palmaris longus fails to form from early in development. Our study reveals the timings of, and suggests mechanisms for, crucial events that enable nascent muscle bundles to reach their mature form and position within the human forelimb.
Topics: Animals; Biomarkers; Embryonic Development; Forelimb; Histocytochemistry; Humans; Immunohistochemistry; Muscle, Skeletal; Protein Transport; Upper Extremity
PubMed: 33234713
DOI: 10.1242/dev.194746 -
European Journal of Dermatology : EJD 2006The perifollicular and interfollicular areas of normal skin may look similar. However, some physiological and pathological processes may specifically involve a thin... (Review)
Review
The perifollicular and interfollicular areas of normal skin may look similar. However, some physiological and pathological processes may specifically involve a thin perifollicular rim. This review illustrates some of the methods available for highlighting the rim of the perifollicular epidermal unit. Non invasive methods rely on dermoscopy, ultraviolet light enhanced visualization (ULEV), skin capacitance imaging and cyanoacrylate skin surface strippings (CSSS). Conventional histology and immunohistochemistry may also show specific perifollicular features without, however, revealing the aspects highlighted by the specific non invasive methods. The clinically relevant modifications consist of pigmentary and hyperkeratotic perifollicular changes.
Topics: Dermoscopy; Epidermis; Hair Follicle; Humans; Immunohistochemistry; Ultraviolet Rays
PubMed: 16709483
DOI: No ID Found -
Toxicologic Pathology Aug 2017Evaluation of the central nervous system (CNS) in the developing mouse presents unique challenges, given the complexity of ontogenesis, marked structural reorganization...
Evaluation of the central nervous system (CNS) in the developing mouse presents unique challenges, given the complexity of ontogenesis, marked structural reorganization over very short distances in 3 dimensions each hour, and numerous developmental events susceptible to genetic and environmental influences. Developmental defects affecting the brain and spinal cord arise frequently both in utero and perinatally as spontaneous events, following teratogen exposure, and as sequelae to induced mutations and thus are a common factor in embryonic and perinatal lethality in many mouse models. Knowledge of normal organ and cellular architecture and differentiation throughout the mouse's life span is crucial to identify and characterize neurodevelopmental lesions. By providing a well-illustrated overview summarizing major events of normal in utero and perinatal mouse CNS development with examples of common developmental abnormalities, this annotated, color atlas can be used to identify normal structure and histology when phenotyping genetically engineered mice and will enhance efforts to describe and interpret brain and spinal cord malformations as causes of mouse embryonic and perinatal lethal phenotypes. The schematics and images in this atlas illustrate major developmental events during gestation from embryonic day (E)7.5 to E18.5 and after birth from postnatal day (P)1 to P21.
Topics: Animals; Atlases as Topic; Central Nervous System; Embryo, Mammalian; Embryonic Development; Female; Fetal Development; Gestational Age; Histocytochemistry; Mice; Pregnancy
PubMed: 28891434
DOI: 10.1177/0192623317728134 -
European Journal of Histochemistry : EJH 2007This review is concerned with recent literature on teleost fish CNS microglia. It covers not only various aspects of these cells, notably comparing them with mammalian... (Comparative Study)
Comparative Study Review
This review is concerned with recent literature on teleost fish CNS microglia. It covers not only various aspects of these cells, notably comparing them with mammalian microglia, but also points out the several potentialities neural tissue of teleosts exhibits in neurobiological research. The relationships between neurons and glial cells are considered in fish, aiming at an integrated picture of the complex ways neurons and glia communicate and collaborate in normal and injured neural tissues. In addition, attention has been paid to different teleost models according to their availability, easy maintenance in experimental conditions, possibilities of embryos manipulation and sequenced genome. The recent setting up of successful protocols for fish glia and mixed neuron-glia cultures, together with the molecular facilities offered from genome knowledge, should provide a new boost to studies about microglia and neuron-microglia relationships.
Topics: Animals; Biomarkers; Cells, Cultured; Central Nervous System; Fishes; Histocytochemistry; Microglia; Neurobiology; Neurons; Species Specificity
PubMed: 18162452
DOI: No ID Found