scholarly journals Structure and surgical dissection layers of the bare area of the liver

2020 ◽  
Author(s):  
Takamichi Ishii ◽  
Satoru Seo ◽  
Takashi Ito ◽  
Satoshi Ogiso ◽  
Ken Fukumitsu ◽  
...  
Keyword(s):  
Connective Tissue ◽  
Surgical Procedures ◽  
Outer Layer ◽  
Safety Margin ◽  
Multilayered Structure ◽  
Parietal Peritoneum ◽  
Careful Attention ◽  
Bare Area ◽  
Macroscopic Structure ◽  
Integrated Study

Abstract Background: The bare area was reportedly formed by direct adhesion between the liver and diaphragm, meaning that the bare area lacked serosal components. This study aimed to analyze the structure of the bare area by an integrated study of surgical and laparoscopic images and pathological studies and describe surgical procedures focusing on the multilayered structure.Methods: Several surgical specimens of hepatectomy were analyzed histologically to evaluate the macroscopic structure of the bare area. Laparoscopic images and cadaver anatomy of the bare area were also examined.Results: The multilayered structure of the bare area comprised the liver, sub-serosal connective tissue, liver serosa, parietal peritoneum, retroperitoneal connective tissue, epimysium of the diaphragm, and diaphragm, in order from the liver to the diaphragm. The liver serosa and the parietal peritoneum fused with each other. This multilayered structure of the bare area is observed almost constantly. There are two layers in the dissection of the bare area in surgical procedures, an outer layer of the fused peritoneum (near the diaphragm) and an inner layer of the fused peritoneum (near the liver). Laparoscopic images enabled us to recognize the multilayered structure of the bare area.Conclusions: Histopathological findings showed the bare area to be a multilayered structure. In cases where tumors are located underneath the bare area, it could be important to dissect the bare area, with careful attention to its multilayered structure. Surgical dissection of the bare area in the outer layer of the fused peritoneum could allow a sufficient safety margin.

scholarly journals Structure and surgical dissection layers of the bare area of the liver

2019 ◽  
Author(s):  
Takamichi Ishii ◽  
Satoru Seo ◽  
Takashi Ito ◽  
Satoshi Ogiso ◽  
Ken Fukumitsu ◽  
...  
Keyword(s):  
Connective Tissue ◽  
Safety Margin ◽  
Multilayered Structure ◽  
Parietal Peritoneum ◽  
Bare Area ◽  
Visceral Peritoneum ◽  
Macroscopic Structure ◽  
The Right ◽  
Hepatic Development ◽  
Integrated Study

Abstract Background : The bare area, which lies between the right liver and diaphragm, should be dissected to mobilize the right liver. The bare area was reportedly formed by direct adhesion between the liver and diaphragm, meaning that the bare area lacked serosal components. This study aimed to analyze the structure of the bare area by an integrated study of surgical and laparoscopic images and pathological studies and describe surgical procedures focusing on the multilayered structure. Methods : Surgical specimens of hepatectomy were analyzed histologically to evaluate the macroscopic structure of the bare area. Laparoscopic images and cadaver anatomy of the bare area were also examined, changing the dissection layers of the bare area. Results : The bare area comprised a multilayered structure that resulted in fusions in the hepatic development among the parietal peritoneum (peritoneum of the diaphragm part) and the visceral peritoneum (liver serosa). The multilayered structure of the bare area comprised the liver, sub-serosal connective tissue, liver serosa, parietal peritoneum, retroperitoneal connective tissue, epimysium of the diaphragm, and diaphragm, in order from the liver to the diaphragm. Laparoscopic images sometimes enabled us to recognize the multilayered structure of the bare area. Conclusions : Histopathological findings showed the bare area to be a multilayered structure. In cases where tumors are located underneath the bare area, it could be important to dissect the bare area, with careful attention to its multilayered structure. Surgical dissection of the bare area in the outer layer of the fused peritoneum could allow a sufficient safety margin.

scholarly journals Therapeutic efficacy of connective tissue autotransplants with periosteum and platelet rich plasma in the management of gingival recession

2013 ◽  
Vol 70 (7) ◽  
pp. 664-669 ◽  
Author(s):  
Bojan Jovicic ◽  
Zoran Lazic ◽  
Milica Nedic ◽  
Stevo Matijevic ◽  
Aleksandra Gostovic-Spadijer
Keyword(s):  
Connective Tissue ◽  
Surgical Procedures ◽  
Platelet Rich Plasma ◽  
Statistical Significance ◽  
Surgical Techniques ◽  
Gingival Recession ◽  
Contralateral Side ◽  
Test Results ◽  
Keratinized Tissue ◽  
Student’S T

Background/Aim. Gingival recession progression in clinical practaice has influenced the development of various surgical procedures and techniques for solving esthetic imperfections and subjective difficulties coused by gingival recession. The aim of this study was to verify efficacy of surgical procedures and to compare both of surgical procedures through the keratinized tissue width. Methods. The study included 20 teeth with gingival recesion, M?ller class I and II. Ten teeth with gingival recession were treated with connective tissue autotransplants with periosteum in combination with coronary guided surgical flap (CTG group). On the contralateral side 10 teeth with gingival recession were treated with the same surgical procedures but in combination with platelet-rich plasma (CTGPRP group). We measured the keratinized tissue width. For statistical significance we used the Student's t-test. Results. The study reveled a statistical significance in reducing vertical deepress of recession by both used treatments. Root deepness in CTG and CTG-PRP group was 90% and 93.5%, respectively. With both surgical techniques we achieved larger zone of keratinized gingiva but with a wide zone of keratinized tissue in CTG - the PRP group. Conclusion. The concept regeneration technique with PRP and with the stimulating influence of platele activated growth factors results in the regeneration of deep periodontal tissue as an important prerequisite for the successful treatment of gingival recession.

The Cuvierian Tubules of Holothuria leucospilota

1957 ◽  
Vol s3-98 (44) ◽  
pp. 455-472
Author(s):  
R. ENDEAN
Keyword(s):  
Connective Tissue ◽  
Outer Layer ◽  
Sea Water ◽  
Adhesive Properties ◽  
Chemical Constitution ◽  
Longitudinal Muscles ◽  
Testicular Hyaluronidase ◽  
Ground Mass

Each Cuvierian tubule of Holothuria leucospilota consists of a bounding layer of large cells beneath which are bundles of fibres embedded in a clear ground-mass. Present also is an axial cavity containing a core of morula-shaped cells. Immediately below the outer layer longitudinal muscles occur and, internal to these, muscle-bands which run spirally are found. The cells of the outer layer contain either granulated compartments or angular bodies. Both compartments and angular bodies contain proteinaceous materials. When a tubule is stretched in sea water the cells of the outer layer split and their contents form an amorphous mass which has strong adhesive properties. The fibres present in the connective tissue of the tubules are collagenous and are associated with acid polysaccharides part, at least, of which are mucopolysaccharides. A polysaccharide which can be removed by testicular hyaluronidase is present in the interfibrillar ground-mass. The chemical constitution of the tubule connective tissue is similar in many respects to that of vertebrate connective tissue. The mode of discharge and elongation of the tubules is discussed.

Simulation of stress-strain state for ropes of closed construction during tension and torsion

2021 ◽  
pp. 2-9
Author(s):  
V. F. Danenko ◽  
◽  
L. M. Volgograd State Technical University
Keyword(s):  
Finite Element ◽  
Cross Sections ◽  
Outer Layer ◽  
Strain State ◽  
Structural Integrity ◽  
Safety Margin ◽  
Stress Strain ◽  
Stress Strain State ◽  
Axial Forces ◽  
Element Simulation

A computer finite-element simulation of the stress-strain state of elements of a closed rope under conditions of joint tension and torsion has been carried out. The redistribution of axial forces and torques in the cross sections of layers during rotation of the rope under the influence of external torque was determined, which leads to a decrease in the safety margin of the rope, a violation of the compatibility of axial and radial movements in the layers and the structural integrity of the rope in the form of wire breakage of the outer layer.

scholarly journals Nτ-Methylhistidine in human skeletal and smooth muscle proteins

1979 ◽  
Vol 41 (1) ◽  
pp. 15-17 ◽  
Author(s):  
I. B. Holbrook ◽  
E. Gross ◽  
M. H. Irving
Keyword(s):  
Smooth Muscle ◽  
Connective Tissue ◽  
Surgical Procedures ◽  
Muscle Protein ◽  
Muscle Proteins ◽  
Protein Breakdown ◽  
Rectus Abdominus ◽  
Muscle Protein Breakdown ◽  
Significant Difference

1. Fifteen pieces of rectus abdominus muscle and fifteen pieces of taenia muscle were removed from patients undergoing various surgical procedures.2. The muscles were extracted, hydrolysed and the content of Nτ-methylhistidine was measured.3. The rectus muscles contained 3.13±0.7 μmols Nτ-methylhistidine/g fat-free dry solid andthe taenia muscles 2.4±0.6 μmols/g fat-free dry solid. There was a statistically significant difference (P < 0.05) between these values using the Student's unpaired t test, although this could have been due to contamination of the taenia muscles with connective tissue.4. The muscle content of Nτ-methylhistidine was at least 40% higher than the only other reported value and therefore the method of calculating muscle protein breakdown based on Nτ-methylhistidine excretion requires revision.

Innervation of vibrissa follicles in the marsupial Trichosurus vulpecula

1974 ◽  
Vol 22 (3) ◽  
pp. 263 ◽  
Author(s):  
DE Hollis ◽  
AG Lyne
Keyword(s):  
Epithelial Cells ◽  
Connective Tissue ◽  
Outer Layer ◽  
Light And Electron Microscopy ◽  
Sensory Receptor ◽  
Merkel Cell ◽  
Myelinated Nerves ◽  
Sensory Receptor Cells ◽  
A Chain ◽  
Connective Tissue Sheath

The innervation of the mystacial vibrissa follicles in the adult brush-tailed possum, T. vulpecula, has been studied by light and electron microscopy. One to five large nerve trunks penetrate the lower part of the follicle capsule and divide many times as they ascend and completely envelop the con- nective tissue sheath of the follicle. As many as 500 myelinated nerves have been observed in the mid region of the largest follicles. Above the mid region, most of the nerves move closer to the centre of the follicle and finally terminate within or near the outer layer of epithelial cells. Four main types of nerve endings have been observed: (1) Sensory receptor cells, called Merkel cells, with their associated neurites are numerous within the outer layer of epithelial cells. (2) Palisade endings, which are less common than the Merkel cell-neurite complexes, surround the upper part of the glassy membrane of the follicle. In transverse section each palisade ending appears as a flattened central neurite partially enveloped on either side by Schwann cell processes. (3) Bulbous endings occur in both the connective tissue sheath and in the outer layer of follicle epithelial cells. They are larger than types (1) and (2) and their ultrastructure varies markedly. (4) Compound endings occur within the connective tissue sheath of the follicle. They are uncommon but large and are composed of a chain of bulbous units joined by nerves; the entire ending may be encapsulated. Within each unit there is a tangle of nerve fibres. The Merkel cell-neurite complexes and the palisade endings in T. vulpecula are remarkably similar to those of eutherian mammals, suggesting that such sensory structures were features of primitive mammals.

scholarly journals Surgical Removal of Defects in the Palate with the Use of TiNi Mesh

2017 ◽  
Vol 2 (1) ◽  
pp. 354
Author(s):  
M.N. Shakirov ◽  
R.N. Dzhonibekova ◽  
I.D. Tazin ◽  
X.O. Gafarov ◽  
V.Y. Mitasov
Keyword(s):  
Surgical Technique ◽  
Connective Tissue ◽  
Minimally Invasive ◽  
Surgical Procedures ◽  
Surgical Techniques ◽  
The Body ◽  
Surgical Removal ◽  
Minimally Invasive Surgical ◽  
Body Tissues

Application of a thin- profiled mesh NiTi with filaments thickness of 40 micrometer sand with the cell size of 3x3-5x5 mm for patients allows to improve the quality of the surgical technique in conducting surgical procedures for eliminating different forms and sizes of the palate defects. Due to its biochemical, biophysical compatibility with the body tissues and the peculiar integration properties a connective tissue grows around and through the structure of the implant by forming a durable frame. At the same time this process takes place by type of covering the muco-periosteal cover from the wound periphery to the center of the palate, over the implant material and completes with the full elimination of the existing defect. The developed method should be considered as minimally invasive surgical techniques and is recommended as a method of choice for patients with various background diseases.

scholarly journals A FINE STRUCTURAL ANALYSIS OF THE EPIDERMIS OF THE EARTHWORM, LUMBRICUS TERRESTRIS L

1966 ◽  
Vol 28 (1) ◽  
pp. 95-108 ◽  
Author(s):  
Richard E. Coggeshall
Keyword(s):  
Plasma Membrane ◽  
Structural Analysis ◽  
Connective Tissue ◽  
Tight Junction ◽  
Outer Layer ◽  
Special Interest ◽  
Fibrous Tissue ◽  
Lumbricus Terrestris ◽  
Epithelial Origin ◽  
Earthworm Lumbricus

A fine structural analysis of the cuticle, epidermal epithelium, and underlying fibrous tissue of the earthworm is presented. The extreme scarcity or absence of fibroblasts in this animal is pointed out. This finding is further evidence for the epithelial origin of the cuticular fibers, and suggests that at least some of the collagenous connective tissue fibers in the interior of this animal are epithelial in origin. The junctional specializations that unite epithelial cells in the epidermis and intestine are described. Of special interest is the fact that the septate desmosome rather than the tight junction is found in these epithelia. It is shown that the septa are not extensions of the plasma membrane across the intercellular gap. Finally, the nature of the small ellipsoidal bodies that are embedded in the outer layer of the cuticle is discussed.

The histology and histochemistry of the developing chorioallantoic membrane in the chick (Gallus domesticus)

1969 ◽  
Vol 47 (3) ◽  
pp. 323-331 ◽  
Author(s):  
B. A. Flumerfelt ◽  
M. A. Gibson
Keyword(s):  
Connective Tissue ◽  
Outer Layer ◽  
Surface Coating ◽  
Cell Layer ◽  
Secretory Granules ◽  
Lymphatic Vessels ◽  
Chorioallantoic Membrane ◽  
Rapid Decrease ◽  
Gallus Domesticus ◽  
Secretory Cells

The chorioallantoic membrane is composed of three layers. (1) An outer chorionic epithelium consisting of a thin outer layer of cells, an inner stratified cell layer, and a central blood sinus lined with flattened ectodermal cells. (2) A middle connective tissue which provides support and a pathway for the distribution of blood and lymphatic vessels. Numerous capillaries pass from this layer to the chorionic sinuses. (3) An inner allantoic epithelium composed of secretory cells. The components of all three layers increase in number and concentration during the first part of the incubation period. After day 17, however, there is a rapid decrease in the composition of each layer. The allantoic epithelium is rich in secretory granules. These granules include a sulfated mucopolysaccharide component. It is suggested that the liberation of this secretion provides a surface coating which protects the underlying tissues against the increasing toxicity of the allantoic contents.

scholarly journals Successful Laparoscopy-assisted Repair of a Rectovaginal Fistula after Low Anterior Resection for Rectal Cancer: A Report of Two Cases

2020 ◽  
Author(s):  
Hiroyuki Ohta ◽  
Kyozo Hashimoto ◽  
Tomoyuki Mizukuro ◽  
Byonggu An ◽  
Yumi Zen ◽  
...  
Keyword(s):  
Rectal Cancer ◽  
Connective Tissue ◽  
Surgical Procedures ◽  
Anterior Resection ◽  
Rectovaginal Fistula ◽  
Low Anterior Resection ◽  
Japanese Patients ◽  
Vaginal Repair ◽  
Diverting Stoma ◽  
Double Stapling

Abstract Background: A rectovaginal fistula (RVF) after low anterior resection for rectal cancer is troublesome and refractory. Although various surgical procedures have been previously described, no definitive procedure has shown satisfactory outcomes. We present two consecutive Japanese patients who underwent successful surgery for a RVF after low anterior resection. Case presentation: The patients were a 61-year-old woman and a 64-year-old woman. They were admitted to our hospital with a chief complaint of fecal discharge from the vagina after low anterior resection using the double-stapling technique for rectal cancer. They were diagnosed with RVF. Local surgical procedures, including diverting ileostomy, were unsuccessful in previous hospitals. Therefore, we performed laparoscopy-assisted repair of the RVF. In both the patients, laparoscopically robust pelvic adhesions were dissected, and the sigmoid colon was transected just before the RVF. Thereafter, in combination with a perineal approach, the rectum along with a previous anastomosis and fistula were completely removed. Surgeries were completed after vaginal repair, redo coloanal anastomosis, and interposition of the dissected connective tissue. In both the patients, the postoperative courses were uneventful. They have complained of neither recurrence of any RVF nor fecal incontinence 1 year and 10 months respectively after diverting stoma closure.Conclusions: A laparoscopy-assisted procedure with reanastomosis and interposition of the perineal connective tissue can be an effective treatment for an RVF after low anterior resection for rectal cancer.

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