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Biomedical subjects

M Juhl

Publications and source records attributed to M Juhl.

At least 55 records · Page 3Linked to original sources
PubMed1983

Localization of carious lesions in occlusal pits and fissures of human premolars.

The position of carious lesions in fissures of 50 maxillary premolars was studied in serial ground sections in polarized light using air and various aqueous media for imbibition. The particular section in which the greatest pore volume was demonstrated, was selected for morphometric measurements of the fissure, i.e. depth, width, and angle. The localization of the carious lesion was registered in relation to four areas around the fissures, i.e. above the entrance, the top and bottom part of the wall, and below the base of the fissure. Most frequently the carious lesion was localized in the lower part of fissures (61%). Multiple foci both in the upper and lower part were found in 36% of the fissures. Only 13% had carious lesions positioned above the entrance. No relationship was found between fissure morphology and site of the carious lesions. However, this study has confirmed that fissured areas are highly susceptible to caries in premolars.

Adolescent↗
PubMed1983

Os odontoideum. A cause of atlanto-axial instability.

Os odontoideum is a rare condition in which instability may damage the upper cervical cord. A delay in diagnosis is not uncommon. This paper describes a series of 11 patients with os odontoideum. The presenting symptoms were divided into three groups: posttraumatic neck-pain, gradually appearing signs of medullary compression and an asymptomatic group. Eight patients had atlanto-axial instability. Six had interlaminar fusion between atlas and axis. No serious complications were seen. Stability was obtained in all patients postoperatively. In case of significant instability, fusion is indicated. In patients with cerebral palsy a closer examination of the upper cervical cord is recommended.

Adult↗
PubMed1981

Morphology of the second kind of follicle in the guinea pig thyroid gland.

The second type of follicle (S follicle) was studied in the thyroid gland of young and mature guinea pigs. A marked activity to non-specific esterase was used as a marker system for the S follicle. Usually a single S follicle was situated in the upper central two-thirds of each lobe occupying 0.5--2.7 mm of the length of the lobe. The S follicle could in both animal groups be divided into three parts, an upper, a middle, and a lower part. The upper tubular part consisted of cuboidal and cylindrical, strong-reacting cells completely separated from the thyroid follicles by connective tissue. The middle part was further subdivided into an irregular follicle without contact to the thyroid follicles, and a distended follicle with several contact areas to the thyroid follicles. An increasing amount of flattened, weak-reacting cells interpreted as thyroid follicle cells were encountered in the S follicle wall adjacent to the contact areas. In young animals the lower part had a tubular appearance like that seen in the upper part, while the lower part of the S follicle in mature animals were more follicle like.

Age Factors↗
PubMed1981

Fine structure of the second kind of thyroid follicles in mature guinea pigs.

The second kind of follicle (S-follicle) is in mature guinea pigs a morphologically heterogeneous structure located in the central part of the upper two-thirds of the thyroid lobe. An S-follicle may appropriately be divided in an upper, a middle, and a lower part. This paper deals with the ultrastructure of the upper tubular part and the middle part. The latter is further subdivided in an irregular follicle and a distended follicle. In the tubular part a single cell type, termed the S-follicle cell, is dominating. This cell is most often arranged in a single layer and is characterized by an indented nucleus and by presence of pinocytose vesicles and hemi-desmosomes along the basal cytoplasm membrane. In addition, C cells are frequently found. In the irregular follicle five different cell types are noticed: S-follicle cells, dark fibrillar cells, granulated cells, ciliated cells, and C cells. The S-follicle cells display an ultrastructure similar to those in the tubular part but are frequently arranged in two or more layers. Both the tubular part and the irregular follicle are surrounded by connective tissue. In the distended follicle, however, contact areas to thyroid follicles are found. Adjacent to these contact areas, cells with an ultrastructure similar to that of thyroid follicle cells proper are encountered in the wall of the S-follicle. This observation suggests that the distended part of an S-follicle in mature guinea pigs might be regarded as a kind of mixed follicle. The origin of thyroid follicle cells proper in the wall of the S-follicle is briefly discussed.

Animals↗
PubMed1977

Superior mesenteric artery syndrome complicating treatment with balanced traction. A case report.

A brief review of the superior mesenteric artery syndrome is given. A case is reported which occurred after 9 weeks of treatment of a fractured femur by continuous traction with balanced suspension. The condition was successfully treated by conservative measures including a plaster hip spica allowing frequent changes of position. The importance of early diagnosis and prompt treatment is emphasized.

Adolescent↗