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Volume 49 (1972 - 197･･･
- Issue 6 Pages 391-
- Issue 5 Pages 271-
- Issue 4 Pages 175-
- Issue 2-3 Pages 75-
- Issue 1 Pages 1-
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Volume 49, Issue 5
Displaying 1-3 of 3 articles from this issue
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Francis James Warner1972 Volume 49 Issue 5 Pages 271-349
Published: 1972
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESS(1) A study has been made of the brain stem of a new born human dicephalous foetus.
(2) A pair of cerebral hemispheres, as well as a separate diencephalon and a separate midbrain for each head member was noted.
(3) The rhombencephalon was conjoined and was larger than that of the normal state.
(4) Heads A and B had a median raphe in the conjoined rhombencephalon.
(5) The fiber tracts, nuclei and nerve roots of the outer sides or lateral walls of the medulla, lateral to the two median raphes,. were relatively normal.
(6) The cerebellar mass was hypoplastic, and contained a single, dysplastic central nuclear mass derived from the anlage of the dentate and probably from the anlage of the other cerebellar nuclei.
(7) Duplication was noted in the medial longitudinal bundles, pyramidal tractsand the medial lemnisci in the conjoined rhomben- cephalon.
(8) Duplication of the hypoglossal nuclei was noted at the levels. of the upper and middle levels of the medulla oblongata, as at the normal level of the decussation of the medial lemniscus.
(9) No evidence of a duplication of the solitary tract or of the dorsal motor nucleus of the vagus nerve was noted in this case.
(10) No decussation of the pyramidal tract fibers was noted in the medulla oblongata.
(11) An Arnold-Chiari malformation was noted in this case.
(12) The ventral parts of the cervical and upper thoracic levels of the spinal cord showed evidence of a duplication of the pyramidal tracts and placement of these pyramidal tracts in the ventral funiculi of the conjoined spinal cord.
(13) At the levels of the upper, middle and lower cervical, as well as the upper thoracic spinal cord there was noted a duplication of the ventral horns of the gray matter of the spinal cord. At the upper and middle cervical levels of the spinal cord there was seen a duplication of the posterior horns of the gray matter of the spinal cord.
(14) A hydromyelic sac was noted in the upper thoracic spinal cord.View full abstractDownload PDF (34271K) -
Takao Tokioka, Yasumichi Fujimoto, Satoshi Suzuki1972 Volume 49 Issue 5 Pages 351-364
Published: 1972
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSDownload PDF (4496K) -
Fusao Yamasaki, Kyozo Takahashi, Toshiro Kamiya1972 Volume 49 Issue 5 Pages 365-389
Published: 1972
Released on J-STAGE: September 24, 2012
JOURNAL FREE ACCESSThe liver and the bile-passage of five Platanista whose body length ranged from 76 to 118 cm were observed macro- and microscopically, and were discussed in the light of comparative anatomy.
The liver of Platanista presents a wedge-like shape, consisting of right and left lobes, the tapering right lobe of which is directed caudad along the median line of the body. The ratio (%) of liver weight to body weight ranged from 1.3 to 2.7.
The liver has no pars nuda and is suspended from the diaphragm, chiefly by the dorsal ligament (consisting of the fusion of the upper and the lower layers of the coronary ligament in ordinary mammals), falciform ligament and partially by the lesser omentum.
The inferior vena cava enters the caudal end of the right lobe and passes through the liver, being completely embedded in its parenchyme. The terminal portion of the intrahepatic vena cava inferior and the continuing part of three main hepatic veins (intrahepatic venous sinus) dilate extremely and are supposed to regulate the blood circulation.
The microscopical structures of the liver of Platanista are quite similar to those of other mammals.
The extrahepatic bile-passage is wholly embedded in the pancreas. Since Platanista has no gall-bladder there is no part that could be called ductus choledochus, and the common hepatic duct takes the name of hepato-pancreatic duct, after receiving at least two pancreatic ducts. The glandular structures of the bile-passage can be found from the thick portion of the interlobular bile duct, and the nature of the gland is serous tubulo-alveolar.
The terminal portion of the hepato-pancreatic duct perforates the duodenal wall and dilates in the tela submucosa, forming the socalled‘duodenal pouch’ as a specialized form of Vater's ampulla. The microscopical structure of the pouch is basically the same as that of the duodenum, and the lamina propria ucosae is occupied with tubulo-alveolar serous glands. The function of the pouch is briefly discussed in relation to the Brunner's gland, which is reported to be lacking in the cetacea.View full abstractDownload PDF (4831K)
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