Liver and Bile-passage of Ganges Dolphin,Platanista gangetica

Yamasaki, Fusao; Takahashi, K; Kamiya, Toshiro

doi:10.2535/ofaj1936.49.5_365

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…However, the duct continued to travel in the intestinal wall for several cm before emptying into the intestinal lumen. This is similar to the arrangement reported in the franciscana dolphin (Yamasaki et al, 1975), the Ganges River dolphin (Yamasaki et al, 1972), the Baiji (Zhou and Li, 19811, and the Bolivian dolphin (Zhou et al, 1982). Green (19721, however, speaking of cetaceans in general, and Hosokawa and Kamiya (19711, describing the fin, sei, and blue whales in particular, reported that this duct discharged directly into the duodenal ampulla.…”

Section: Discussionsupporting

confidence: 81%

“…A report by Zhou and Li (1981) on the Baiji noted mucous glands in this region believed to be primitive submucosal glands. No submucosal glands were found in the duodenum of the Ganges River dolphin (Takahashi and Yamasaki, 1972).…”

Section: Discussionmentioning

confidence: 85%

“…The stomach ended at the pyloric sphincter and led directly into the duodenal ampulla, a dilated sac initiating the small intestine in the manner described for a variety of other mysticetes and odontocetes (Weber, 1885;Turner, 1889;Jungklaus, 1898;Slijper, 1962a;Kleinenberg et al, 1969;Hosokawa and Kamiya, 1971;Takahashi and Yamasaki, 1972;Berzin, 1972;Green, 1972;Pilleri and Gihr, 1972;Yamasaki et al, 1975;Zhou et al, 1982). Histologically, Hosokawa and Kamiya (1971), writing on the blue, fin, sei, and sperm whales, found that the proximal half of the ampulla's mucosa was structurally very similar to the pyloric chamber, whereas the distal half more closely resembled that of the duodenum proper.…”

Section: Discussionmentioning

confidence: 96%

“…We were unable to demonstrate villi in the lining of the duodenal ampulla of our bowhead specimens. In the Ganges River dolphin, although Takahashi and Yamasaki (1972) reported that the lining of the duodenal ampulla was similar to that found in the pyloric chamber of the stomach, the cells comprising the glands of the pyloric lining in this species were said to resemble chief (rather than mucous) cells (Yamasaki and Takahasi, 1971). Despite these variations in histological observations of the ampulla mucosa, a well-developed sphincter has been noted repeatedly in cetaceans at the termination of the pyloric chamber of the stomach while there is none at the termination of the duodenal ampulla (Watson and Young, 1880;Harrison et al, 1967;Yamasaki and Takahashi, 1971;Berzin, 1972;Yamasaki et al, 1974).…”

Section: Discussionmentioning

confidence: 99%

“…The columnar cells and mucous cells which we found predominating in the lining of the intestinal crypts of the duodenum proper in the bowhead appear typically mammalian and are generally compatible with descriptions of other cetaceans, the domestic mammals, and man (Yamasaki et al, 1975;Harrison et al, 1977;Ham and Cormack, 1979;Banks, 1981). However, Zhou et al (1982) reported the absence of goblet cells in the intestinal crypts of the Bolivian dolphin as did Takahashi and Yamasaki (1972) in the glands of the Ganges River dolphin. The presence of enteroendocrine cells within the duodenal crypts of the bowhead agrees with their description in the duodenum of man (Ham and Cormack, 1979) and domestic mammals (Banks, 1981).…”

Section: Discussionmentioning

confidence: 99%

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Observations on the anatomy of the stomach and duodenum of the bowhead whale,Balaena mysticetus

et al. 1987

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Gastric and cranial duodenal structure of the bowhead whale (Balaena mysticetus) was examined grossly and microscopically. The stomach was arranged in a series of four compartments. The first chamber, or forestomach, was a large nonglandular sac lined by a keratinized stratified squamous epithelium. It was followed by the fundic chamber, a large, somewhat globular and entirely glandular compartment. At the entrance of the fundic chamber, a narrow cardiac gland region could be defined. The remaining mucosa of the chamber contained the proper gastric glands. A narrow, tubular connecting channel, the third distinct gastric division, was lined by mucous glands and joined the fundic chamber with the final stomach compartment, or pyloric chamber. This fourth chamber was also tubular and lined by mucous glands but was of a diameter considerably larger than the connecting channel. The stomach terminated at the pyloric sphincter which consisted of a well-developed band of circular smooth-muscle bundles effecting a division between the pyloric chamber and small intestine. The small intestine began with the duodenal ampulla, a dilated sac considerably smaller than the fundic chamber of the stomach. The mucosa of this sac contained mucous glands throughout. The ampulla led without a separating sphincter into the duodenum proper which continued the intestine in a much more narrow tubular fashion. The mucosal lining of the duodenum was composed of villi and intestinal crypts. Although their occurrence varied among whales, enteroendocrine cells were identified within the mucous glands of the cardiac region, connecting channel, pyloric chamber, and cranial duodenum. The hepatopancreatic duct entered the wall of the duodenum shortly after the termination of the duodenal ampulla and continued intramurally along the intestine before finally joining the duodenal lumen.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 85%