Abstract
The cross-sectional area and the percentage of the muscle, vertebra, viscera and fatty layer, and the thickness of fatty layer were measured on CT images of the plane of 6th cervical vertebrate from 27 humans (11 males, 16 females) . The differences in three body types (by the Rohrer Index), sexes and ages were discussed. Results: 1) In the cross-sectional area of classified tissues and organs, the values of muscles were the largest, and the next largest were the values of fatty layer. For the rest, the values were greater in order of viscera, vertebra in males, however, they were reversed in females. 2) The percentage of the cross-sectional area of each tissue and organ to the total area: On the ratio of muscle, males were larger than females, but the ratio of vertebra in females were larger than in males. And the sexual difference were not observed in these ratios. In males, the ratio of muscles decreased with the age, and the ratio of the fatty layer increased with the age. 3) In the three body types, the ratio of viscera and of muscles increased in order of the A-type, the C-type and the D-type, however, the ratio of the fatty layer decreased in this order. 4) The area of fatty mass at the nape: those of males were larger in the C-type and the D-type than in the A-type and those of females were larger in D-type than in the A-type and the C-type. 5) The thickness of the fatty layer in 4 points of the neck: A tendency that the thickness of the fatty layer decreased in order of anterior, lateral and posterior was observed. Comparing with the other levels of trunk, the values on anterior neck of the D-type were larger than that of midpoint of sternum in males, and the values on posterior neck was smaller than the values on upper sternal level in both sexes.
