The Author studied the incidence, size and position of the cervical sympathetic ganglia distributions of the rami communicantes, types of ansa subclavia in one hundred and five Korean adult cadarvers from 1972 to 1978.
1. The incidence, size and position of cervical sympathetic ganglia
The superior cervical ganglion found an incidence of 100% with average length of 31. 92±8.43mm and width` of 8. 01±2.77mm, and situated on the level from the lower one-third of the body of the first cervical vertebra to the upper one-third of the third cervical vertebra. The middle cervical ganglion found an incidence of 96 . 6 % with average length of 10. 08±5. 22mm and width of 3. 92±1. 91mm, situated on the level from the upper one-third of the tody of the fifth cervical and first thoracic vertebrae. The inferior cervical ganglion found an incidence of 33.0% with average length of 14.28±4.57mm and width of 7.41+3.08, and situated on the level from the upper one third of the body of the seventh cervical vertebra to the upper one third of the body of the first thoracic vertebra. The cervicothoracic ganglion found an incidence of 68.4% with average length of 20.9±7. 55mm and width of 8. 16±3.30mm, and situated on first thoracic vertebra to the upper onethird of the body of the second thoracic vertebra.
2. Distributions of the gray rami communicantes.
The first and second cervical nerves receive gray rami communicantes from the superior cervical ganglion in 100%. The third cervical nerve receives gray rami communicantes from the superior cervical ganglion in 96. 0% and from the high middle cervical ganglion in 3.0%, and from the low middle cervical ganglion in 1%.
The fourth cervical nerve receives gray rami commicantes from . the superior cervical ganglion in `67.5%., from the high middle cervical ganglion in 29.6% and from. the low middle cervical in 2.8%.
The fifth cervical nerve receives gray rami communicantes from th superior cer-vical ganglion in 3.1% the high middle cervical ganglion in 74.2%, from the lowmiddle cervical ganglion in 18.9%, from the low middle cervical ganglion in 18. 9%, from the inferior ganglion in 2.5% and from the cervicothoracic ganglion in 1. 176. The sixth cervical nerve receives gray rami communicantes from the highmiddle cervical ganglion in 43.8%, from the low middle cervical ganglion in 34. 8%, from the inferior cervical ganglion in 8.6% and from the cervicothoracic ganglion in 13. 3%. The seventh cervical nerve receives gray rami communicantes from the high middle ganglion in 2.3j, from the low middle cervical ganglion in 11. 6%, from the inferior cervical ganglion in 31.9°% and from the cervicothoracic ganglion in 54.2%.
The eighth cervical nerve receives gray rami communicantes from the low middle cervical ganglion in 3.3°,0, from the inferior cervical ganglion in 61.7% and from the first thoracicganglion 2.3%o. The first thoracic nerve receives gray rami communicantes from the inferior cervical ganglion in 7.6% from the cervicothoracic ganglion in 76.6%, from the first thoracic nerve in 13.0% and from the second thoracic nerve in 2.7%.
3. Types of the ansa subclavia.
Type I ansa subclavia was found in 0.5 j, type II 36.7%, type III in 54.3%, type IV in 3.7% and type V in 4.8% of cases, respectively.
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