哺乳動物における下咽頭および頸部食道の比較解剖学的研究
1979 年 25 巻 1 号 p. 38-52
詳細
1979 年 25 巻 1 号 p. 38-52
Anatomical structure of the hypopharynx and cervical esophagus of men, dogs, cats, rabbits, cows, horses and pigs was comparatively investigated under an operation microscope. The results are summerized as follows:
1. Four different types of the structure of the cricopharyngeal muscle were observed. This indicates that there are differences in strength and area of pinch-cock activity among the species.
2. The esophagus was attached to the larynx at the midsaggital line of the posterior aspect of the cricoid cartilage with a muscular structure. The muscular structure was rectanglar in horses and rabbits, whereas it was of fan-shape in men, dogs and pigs. No muscular structure was observed in cats.
3. In horses, the muscular structure presented a very unique location, intervening between the arytenoid cartilage and the ring muscle of the esophagus. This may account for the special pattern of deglutition in horse.
4. In men, dogs and cats, the cricopharyngeal muscle seemed less powerful but broader in the area of pinch-cock activity than in cows, horses, pigs and rabbits.
5. In the esophagus of dogs and cats, there was a ring of mucosal bulge at the lower edge of the cricoid cartilage. This seems to suggest that the bulge conpensates for the less powerful action of the pinch-cock.
