A morphorogical investigation of the thoracic sympathetic trunks and the chain ganglia of human fetuses
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概要
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The present investigation was made to elucidate the anatomical features of the thoracic portion of the sympathetic trunks, their ganglia, and their rami communicantes in fetuses.<BR>Twenty thoracic sympathetic trunks in ten fetuses, 5-6 months old, were studied. The results obtained were as follows;<BR>1) The total number of ganglia in the thoracic sympathetic trunks in ten fetuses was 206 and the average number of ganglia was 10.3 in the thoracic portion of the trunk.<BR>2) On the ventral side of the neck of the first rib, the first thoracic ganglion was fused with the inferior cervical ganglion to form the stellate ganglion on both sides in all of the ten fetuses. In one of these ten subjects the stellate ganglion was further fused with the second thoracic ganglion. The stellate ganglia were classified into three types according to shape; Type I, II, and III. The most frequent type was Type I, the cylinder shape, which was found in 9 out of 20 (45%) .<BR>3) The ganglia below the second thoracic ganglion, 186 in total, were classified into nonfusional and fusional form ganglia. The nonfusional form ganglia, 153, were further classified into 5 types according to shape, of which the most frequent was the trianguler type, 77 of 153 (50.3%) . The fusional form ganglia, 33, were again classified into 4 types according to shape. The most frequent of them was Type II where one ganglion makes a contact with the other without any narrow segment at the juncture. The incidence of such type was 14 of 33 (42.4%) .<BR>4) Fourteen cross communications between the right and the left sympathetic trunks were confirmed in 8 out of 10 fetuses.<BR>5) All of the thoracic rami of thoracic spinal nerves had rami communicantes, connecting with sympathetic trunks. The number of rami communicantes was 3 on the average. The more caudally ventral rami were located, the less the number of rami communicantes became.<BR>6) Rami communicantes to the dorsal rami of the thoracic spinal nerves were confirmed in 148 out of 240 thoracic spinal nerves corresponding to the spinal cord segments (61.7%) .<BR>7) Rami communicantes to the meningeal branches of the thoracic spinal nerves were confirmed in 51 out of 240 thoracic spinal nerves corresponding to the spinal cord segments (21.3%) .<BR>8) Four ganglia intermedia were confirmed on the rami communicantes to the ventral rami of the eleventh and twelfth thoracic spinal nerves.
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日本医科大学医学会 | 論文
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