scholarly journals Microscopic Structure of the Epithelium Lining the Epiglottis in Wistar Rats

2018 ◽  
Vol 75 (1) ◽  
pp. 5
Author(s):  
Vasile RUS ◽  
Aura Ștefania PARDI ◽  
Bianca MATOSZ ◽  
Flavia RUXANDA
Keyword(s):  
Histological Examination ◽  
Wistar Rats ◽  
Squamous Epithelium ◽  
Respiratory Epithelium ◽  
Microscopic Structure ◽  
Stratified Squamous Epithelium ◽  
Keratin Layer

The aim of this study was to investigate the type of the epithelium present on the epiglottis surface, through histological examination. The epithelium lining the pharyngeal side of epiglottis is keratinized stratified squamous. The thickness of the keratin layer is different from one subject to another. Usually the keratin layer extends to the apex of the epiglottis, but in some of the animals taken into study, the keratin layer extends to the apical third of the laryngeal side of epiglottis. The epithelium lining the laryngeal side is different. In most of the epiglottises examined, the surface is lined by non-keratinized stratified squamous epithelium in the apical third. The rest of the laryngeal side of the epiglottis is lined by respiratory epithelium type. In one subject, the entire laryngeal surface is lined by a non-keratinized stratified squamous epithelium. Our study highlights that the pharyngeal side of epiglottis is lined by a keratinized stratified squamous epithelium, whereas on the laryngeal side, the epithelium in the apical third is non-keratinized stratified squamous and at the rest of the surface the epithelium is pseudostratified.

Spontaneous hyperplastic and metaplastic duct epithelium in the sublingual salivary glands of Wistar rats

1986 ◽  
Vol 20 (2) ◽  
pp. 127-131 ◽  
Author(s):  
E. van Esch ◽  
H. C. Dreef-van der Meulen ◽  
V. J. Feron
Keyword(s):  
Salivary Glands ◽  
Small Groups ◽  
Wistar Rats ◽  
Squamous Epithelium ◽  
Fibrous Tissue ◽  
Inflammatory Cells ◽  
Epithelial Hyperplasia ◽  
Duct Epithelium ◽  
Stratified Squamous Epithelium ◽  
Focal Epithelial Hyperplasia

Focal epithelial hyperplasia and metaplasia were observed in the intralobular ducts of the sublingual salivary glands of 302 out of 1142 Wistar rats. These rats (aged 16-145 weeks) served as controls in toxicological experiments. The ductal changes varied from small groups of irregular cylindrical cells with basophilic cytoplasm and vesicular nuclei, with often prominent nucleoli, to large areas of non-keratinized stratified squamous epithelium with marked mitotic activity and necrotic superficial cells being released in the lumen. Mononuclear inflammatory cells were often present in fibrous tissue surrounding altered ducts. Within certain limits the degree and incidence of the changes increased with increasing age; their aetiology is unknown.

A new technique using cultured epithelial sheets for the management of epistaxis associated with hereditary haemorrhagic telangiectasia

1993 ◽  
Vol 107 (6) ◽  
pp. 510-513 ◽  
Author(s):  
Catherine M. Milton ◽  
J. C. Shotton ◽  
D. J. Premachandran ◽  
Barbara M. Woodward ◽  
J. W. Fabre ◽  
...  
Keyword(s):  
Nasal Septum ◽  
Squamous Epithelium ◽  
Respiratory Epithelium ◽  
New Technique ◽  
Hereditary Haemorrhagic Telangiectasia ◽  
Buccal Epithelium ◽  
Severe Epistaxis ◽  
Stratified Squamous Epithelium ◽  
A New Technique ◽  
Epithelial Sheets

A new technique for the treatment of severe epistaxis associated with hereditary haemorrhagic telangiectasia is described. The nasal septum and inferior turbinates, surgically denuded of respiratory epithelium, were grafted using autografts of cultured epithelial sheets derived from buccal epithelium. All patients upon whom this technique has been used have shown considerable lessening in the frequency and severity of their epistaxes although two patients received grafts on two occasions, in each case approximately three months apart. It is postulated that a nasal lining of stratified squamous epithelium is likely to be more resistant to trauma than the normal respiratory type, and this is supported by the observation that bleeds very seldom occur from the oral cavity in this syndrome.

The harp seal, Pagophilus groenlandicus (Erxleben, 1777). XIII. The gross and microscopic structure of the auditory meatus

1971 ◽  
Vol 49 (2) ◽  
pp. 241-248 ◽  
Author(s):  
F. Ramprashad ◽  
S. Corey ◽  
K. Ronald
Keyword(s):  
Connective Tissue ◽  
Squamous Epithelium ◽  
Harp Seal ◽  
Elastic Fibers ◽  
Microscopic Structure ◽  
Serial Sections ◽  
Sebaceous Glands ◽  
Pagophilus Groenlandicus ◽  
External Orifice ◽  
Stratified Squamous Epithelium

The gross and microscopic structure of the auditory meatus of the harp seal (Pagophilus groenlandicus) is described from dissections and serial sections. The meatus bends ventrally from the oval external orifice, posteroventrally, ventrally, and finally medially into the cranium. The ventrally directed wall of the meatus is membranous, the posteroventral and ventrally directed wall is incompletely wrapped by cartilage, and the medially directed wall is bony. The areas between sections of the cartilaginous wall ate completed by connective tissue. The meatus is closed internally by the intrinsic helicis and antitragicus auricular muscles. The external orifice is closed by the superficial auricular muscles. The auditory meatus is lined with stratified squamous epithelium, sebaceous glands, and ceruminous glands. Longitudinal blood sinuses and elastic fibers in the hypodermis may function as a pressure regulating device during diving. Blood sinuses are most prominent in the bony region of the meatus and extend into the tympanic sulcus of the pars tensa. Blood sinuses engorged with blood and a closed meatus may enhance transmission of sound to the tympanic membrane when the seal is under water.

A case of vascular leiomyoma of the larynx

1994 ◽  
Vol 108 (7) ◽  
pp. 593-595 ◽  
Author(s):  
K. Hirakawa ◽  
Y. Harada ◽  
T. Tatsukawa ◽  
A. Nagasawa ◽  
M. Fujii
Keyword(s):  
Histological Examination ◽  
Supine Position ◽  
Direct Laryngoscopy ◽  
Squamous Epithelium ◽  
Complete Removal ◽  
Normal Mucosa ◽  
General Anaesthetic ◽  
Vascular Leiomyoma ◽  
Chief Complaints ◽  
Stratified Squamous Epithelium

AbstractWe present a 68-year-old woman with a vascular leiomyoma of the larynx, a benign tumour that rarely involves that organ. Chief complaints were a feeling of a narrowing of the pharynx and difficulty in breathing in the supine position. A spherical tumour measuring 1.5 cm and covered with normal mucosa was found avthe margin of her epiglottis. The patient was administered a general anaesthetic and the tumour was successfully removed via direct laryngoscopy. Histological examination revealed that the tumour lay beneath a layer of stratified squamous epithelium and was encased in a welldefined fibrous capsule. The tumour parenchyma was composed of proliferated fibres that consisted of elongated cells, surrounded by an abundance of blood vessels. Its complete removal is the treatment of choice with care taken to avoid profuse bleeding. Recurrence is rare.

Localized Juvenile Spongiotic Gingival Hyperplasia: Report of Two Cases

2017 ◽  
Vol 41 (3) ◽  
pp. 228-231 ◽  
Author(s):  
Eleni-Marina Kalogirou ◽  
Konstantina Chatzidimitriou ◽  
Konstantinos I. Tosios ◽  
Evangelia P. Piperi ◽  
Alexandra Sklavounou
Keyword(s):  
Histological Examination ◽  
Squamous Epithelium ◽  
Inflammatory Cells ◽  
Final Diagnosis ◽  
Pediatric Dentistry ◽  
Gingival Hyperplasia ◽  
Gingival Epithelium ◽  
Stratified Squamous Epithelium ◽  
Maxillary Lateral Incisor ◽  
Shed Light

Objective: Localized juvenile spongiotic gingival hyperplasia (LJSGH) is a painless gingival swelling that histologically exhibits hyperplasia of the non-keratinized stratified squamous epithelium, intercellular edema and spongiosis of the spinus layer, and exocytosis of inflammatory cells. LJSGH pathogenesis remains to be elucidated, while a possible origin from the gingival sulcus epithelium is nowadays proposed. Study design: We report two cases of LJSGH with immunohistochemical evaluation of cytokeratins (CKs) 18 and 19. Results: Both cases concerned 12-year-old boys, who presented with a well-circumscribed bright red pedunculated papillary swelling on the marginal gingiva of the left maxillary lateral incisor. With the provisional diagnosis of LJSGH, the lesions were excised under local anesthesia and histological examination supported the final diagnosis of LJSGH. In both cases, the lesional epithelium showed intense and mild positivity for CK19 and CK18, respectively, while the adjacent normal gingival epithelium expressed CK19, but not CK18, only in the basal cell layer. The postoperative course was uneventful in both patients and no recurrence has been reported. Conclusion: LJSGH is a recently introduced entity that is worth attention in the clinical pediatric dentistry. Clinical and histological examination is required for the final diagnosis, while immunohistochemistry has shed light to LJSGH pathogenesis.

Junction of the Epithelium and Lamina Propria of the Bovine Rumen Mucosa

1967 ◽  
Vol 25 ◽  
pp. 68-69
Author(s):  
Al W. Stinson
Keyword(s):  
Osmium Tetroxide ◽  
Squamous Epithelium ◽  
Short Chain Fatty Acids ◽  
Chloride Ions ◽  
Fermentation Products ◽  
Ruminant Species ◽  
Protective Shield ◽  
Stratified Squamous Epithelium ◽  
Lead Hydroxide ◽  
Acetic Acids

The stratified squamous epithelium which lines the ruminal compartment of the bovine stomach performs at least three important functions. (1) The upper keratinized layer forms a protective shield against the rough, fibrous, constantly moving ingesta. (2) It is an organ of absorption since a number of substances are absorbed directly through the epithelium. These include short chain fatty acids, potassium, sodium and chloride ions, water, and many others. (3) The cells of the deeper layers metabolize butyric acid and to a lesser extent propionic and acetic acids which are the fermentation products of rumen digestion. Because of the functional characteristics, this epithelium is important in the digestive process of ruminant species which convert large quantities of rough, fibrous feed into energy.Tissue used in this study was obtained by biopsy through a rumen fistula from clinically healthy, yearling holstein steers. The animals had been fed a typical diet of hay and grain and the ruminal papillae were fully developed. The tissue was immediately immersed in 1% osmium tetroxide buffered to a pH of 7.4 and fixed for 2 hrs. The tissue blocks were embedded in Vestapol-W, sectioned with a Porter-Blum microtome with glass knives and stained with lead hydroxide. The sections were studied with an RCA EMU 3F electron microscope.

Note on the Transformation of Ciliated into Stratified Squamous Epithelium as a result of the Application of Friction

1890 ◽  
Vol 16 ◽  
pp. 119-120 ◽  
Author(s):  
John Berry Haycraft ◽  
E. W. Carlier
Keyword(s):  
Mucous Membrane ◽  
Squamous Epithelium ◽  
The Other ◽  
Ciliated Epithelium ◽  
Deep Groove ◽  
Stratified Squamous Epithelium ◽  
Trachealis Muscle

(Abstract.)In man, in the rabbit, and some other animals the trachea is built up of a series of cartilaginous rings incomplete behind; the rings being completed in this position by the trachealis muscle.The mucous membrane forms a smooth cylindrical lining for the whole tube, and is covered by a ciliated epithelium.In the cat and dog the cartilage rings completely encircle the trachea, and overlap posteriorly, and the trachealis muscle, which is well developed, is placed outside the cartilage, and has a powerful action in varying the diameter of the tube.When this muscle contracts the overlapping ends of the cartilage ride one upon another, and the projecting ends form a vertical ridge down the inside of the trachea, which can be readily seen on slitting the organ open. This ridge is separated by a deep groove from the other end of the plate.

Sign in / Sign up

Export Citation Format

Share Document