PubMed Health⌕ Search

Biomedical subjects

H Hayama

Publications and source records attributed to H Hayama.

8 recordsLinked to original sources
PubMed2001

Relationship of third molar development and root angulation.

Angled roots are seen in mandibular third molars, which have a high frequency of incomplete impaction. We examined the relationship between incomplete impaction and angled roots. We enrolled orthopantomographs to determine the prevalence of angled roots in 239 men and 222 women aged 21--35 years with bilateral mandibular third molars. Angled roots were more frequent in subjects in whom the third molars had a different status on each side than in those with the same status on both sides (men: P<0.05; women: P<0.01). The incidence of women with angled roots in those with bilateral incomplete impactions was higher than that in those with bilateral eruption (P<0.01). Angled roots among mandibular third molars are related to environmental factors. Angled roots occur more frequently in women with incomplete impaction than in those with full eruption.

Adult↗
PubMed2001

Alteration of the angle of the coronoid process in prognathism.

Muscles and bones may dynamically affect the functions of each other, resulting in changes in the activity of the muscle and/or morphological change in the bones. However, alterations of the morphology of the coronoid process have not been documented in relation to the temporal muscle between the mandible and the cranium. Angles of the coronoid process to the line through the right and the left frontotemporale were measured on posteroanterior (PA) cephalograms in patients with normal occlusions and Class II, division 1 malocclusions, and those with true skeletal Class III malocclusions. Standard deviation of the angle of the coronoid process in patients with Class III malocclusions was greater than those subjects with normal occlusion or Class II, division 1 malocclusions. Differences of angles between the right and the left coronoid process in each patient of either sex were significantly large in true skeletal Class III malocclusions (both P < 0.001). Large variation of angle of the coronoid process was related to prognathism, and this effect may represent adaptation of temporal muscle function to a variety of alterations in mandibular morphology.

Adaptation, Physiological↗
PubMed1991

Actual characteristics of the glands distributed in the lamina propria mucosae of the fowl esophagus.

We performed histological and histochemical investigations on the glands distributed in the lamina propria mucosae of the fowl esophagus and demonstrated their actual characteristics. 1. Glandular cells of the compound tubular glands located in the lamina propria mucosae contained a number of fine pepsinogen granules. 2. Reactions to neutral, weak and strong acid mucopolysaccharides, neutral mucus type II and III and sialomucin were evidently positive in these cells. 3. Based on the facts in 1) and 2), we consider that the glands located in the fowl esophagus are undifferentiated gastric glands. 4. The same glands possessed no parietal cells. 5. We demonstrated that the esophageal cardiac glands in the lamina propria mucosae of human esophagus were undifferentiated gastric glands, and they possessed parietal cells. These glands were confirmed in humans alone among the mammalia. 6. The significance of the existence of the same kind of gland in human and fowl esophagus is extremely important. 7. PAS-positive substance in the above-mentioned glands in the fowl esophagus contains sulfuric, acid, neutral mucopolysaccaride and neutral mucus of type II and III but no glycogen. The compound tubular glands distributed in the lamina propria mucosae of the fowl esophagus have been described as mucous glands. We performed histochemical investigation and demonstrated that these glands were undifferentiated gastric glands.

Animals↗
PubMed1991

Proventricular glands in fowl.

Some researchers have already described the fowl proventriculus. However, we believed there was a need for detailed carbohydrate histochemical investigations on the same glands. Moreover, some researchers had erred about the lamina muscularis mucosae. The results of these investigations are as follows. 1. The proventricular glands consist of both superficial and profound gastric glands. 2. The superficial glands are distributed in the lamina propria mucosae while the profound glands exist in the tela submucosa. 3. The superficial glands are simple, branched tubular glands. The columnar glandular cells are arranged in a simple layer and react strongly to PAS, AB (pH 2.5 and 0.5). These appear to be dark purple when they are stained with PAS-AB (pH 2.5). Some other methods have also been tried. 4. Judging from the data 3), the superficial gastric glands contain neutral, weak and strong acids, sulfuric and acid mucopolysaccharides, sialomucin, and II and III neutral mucus type. 5. Glandular cells in the body and basal portions of the superficial gastric glands contain a large number of fine pepsinogen granules. 6. Judging from the data of 3)-5), we believe that the superficial gastric glands are undifferentiated gastric glands and that they are same kinds of glands that are found in mammals. 7. A large number of profound gastric glands fill the tela submucosa. They are compound tubular glands, and are composed of many glandular alveoli. Their columnar glandular cells are arranged in a simple layer. 8. These glandular cells react moderately to PAS, negatively to AB (pH 2.5 and 0.5) and PAS-AB (pH 2.5). Moreover, we observed some other reactions.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1991

Glands distributed in the lamina propria mucosae of the esophagus in the gecko and Japanese lizard.

In an earlier study, we found compound tubular glands distributed in the lamina propria mucosae of human and fowl esophagus. Subsequently, we discovered bottle-shaped glands in the Japanese lizard and gecko esophagus in the same lamina as that of the human and fowl. Moreover those glands produced equivalent pepsinogen granules. We provide below, a detailed description on the results. 1. Bottle-shaped glands were distributed in the lamina propria mucosae of the Japanese lizard and gecko esophagus. 2. A large number of those glands were distributed in the lower region of the esophagus, but did not exist in the upper and middle regions of the esophagus. 3. The esophageal mucous membrane of the gecko and Japanese lizard were covered with a simple columnar ciliated epithelium, and the same epithelium reacted strongly to PAS and AB (pH 2.5), moderately to AB (pH 0.5) or negatively. 4. PAS-AB (pH 2.5) stain presented a dark blue color or a deep red color or a deep red and dark blue mixed color in one section. 5. The above-mentioned glands contained pepsinogen granules. 6. Those glands do not possess parietal cells.

Animals↗
PubMed1990

Do the cardiac glands exist? 7. The cow.

The glands distributed in the narrow region of the abomasum contiguous to the omasum of the cow have been described as cardiac glands. We doubted this assertion and therefore performed histological and histochemical investigations of the glands to clarify their characteristics. 1. All glandular cells except the parietal cells in a few glands contiguous to the omasum react strongly to PAS, AB(pH 2.5), and PAS-AB(pH 2.5) staining, and moderately to AB(pH 0.5) staining. 2. Glandular cells at the base of these glands contain fine pepsinogen granules and a few parietal cells are distributed in these glands, indicating that they are undifferentiated gastric glands and that the so-called cardiac glands do not exist in the cow stomach. 3. Glandular cells in undifferentiated gastric glands are filled with PAS, AB(pH 2.5 and 0.5) and PAS-AB(pH 2.5) positive substances. Which gradually decrease and finally disappear with differentiation, remaining only in the neck (mucous neck cells) and the cells in the upper part of the glandular body (immature chief cells), in mature gastric glands. 4. Mature chief cells in differentiated gastric glands are distributed in the middle and lower bodies and base of the glands and contain a number of PAS and PAS-AB(pH 2.5) positive granules and a large number of coarse pepsinogen granules, while pepsinogen granules in the mucous neck cells and immature chief cells are finer. 5. In the cow the region in which undifferentiated gastric glands are located is very narrow. 6. Parietal cells in the cow stomach are numerous.(ABSTRACT TRUNCATED AT 250 WORDS)

Abomasum↗