Archive image from page 259 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 dicular to the two bars ; now move the bars up to p 3, also at an angle of 45° with E E, and the fibre L K becomes more oblique than at the position p 2. Therefore a tension may change from the oblique to the perpen- dicular relatively to the ribs; but it can never so change its relation to the spine. Thus L' K.' and i/ K' between the bars at P 3 cross each other, in the same direc~ tion, but in different degrees of obliquity; when the bars are at p 4., the
Archive image from page 259 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0402todd Year: 1849 dicular to the two bars ; now move the bars up to p 3, also at an angle of 45° with E E, and the fibre L K becomes more oblique than at the position p 2. Therefore a tension may change from the oblique to the perpen- dicular relatively to the ribs; but it can never so change its relation to the spine. Thus L' K.' and i/ K' between the bars at P 3 cross each other, in the same direc~ tion, but in different degrees of obliquity; when the bars are at p 4., they decussate in directions contrary with reference to the bars, but not with reference to the body E E. The position of the ribs is similar to the bars at p 4, therefore the decussation of the inter- costal muscles must be viewed with reference to the spine. The intercostal fibres never cross each other like the lines L'K' and I/'K' (fig- 675.), nor can they, by any change of movement, ever assume thatposition ; i. e. if they do not decussate in a direction con- trary with relation to the spine, in no change of position, throughout the range of a semi- circle, can they ever become directly decus- sating fibres but when they directly cross each other as v D and V'B (fig. 676.) relative to E E, in every other position to which the bars \ body, and A c, B D two levers representing ribs, allowing of free rotation at their centres of motion A and B. These two bars are per- pendicular, or at 90°, with reference to the body E E ; let L K represent a connecting tension or elastic fibre of any kind, this is oblique with reference to the two bars A c and B D, but move these bars down to the position of P 4, at an angle of 45° to the body E E, and the fibre L K becomes perpen- can be moved, they will be seen still to main- tain the same decussation. Action of the intercostal muscles. — There is, probably, no subject in the whole range of science which has excited more violent con
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