lOO 
THOMPSON YATES LABORATORIES REPORT 
runs abruptly backwards along the internal border of the sole for two inches, towards the heel. About 
the inner border of the sole of the foot, at a point vertically below the internal malleolus, and afterwards 
3 centims. in front of the point of the heel it again abruptly turns to pass upwards between tendo Anhillis 
and the internal malleolus, nearer the latter than the former. The line thence slopes across tendo Archillis 
obliquely to reach the fibular side of it, which it attains 5 centims. above the level of the malleoli. It 
next slants across to the fibular side of the calf muscles, so that 8 centims. above the external malleolus 
it is placed only 3.5 centims. from the fibula and 5.5 centims. behind the border already traced. It then 
runs nearly vertically over the calf muscles to the lower apex of the popliteal space, and continues to the 
Jorder line of the 
Vllth cervical. 
Border line of the 
1st thoracic. 
top of that space {i.e., to a point 10 centims. above the line of flexure behind the knee) in such a line 
as to fairly bisect the space. At 10 centims. above the line of flexure, it suddenly recurves so as to include 
an angle of not more than 35°, and descends in a slightly-curved line along the posterior border of 
biceps muscle : this leaves at the level of the flexure of the knee, where it passes to reach the point from 
which the tracing of it was commenced. (See fig. 7a, i, 2, and 3). 
Measurements taken were as follows : — 
1. From head of fibula to outer malleolus measures 36 centims. 
2. Narrowest width of the anassthetic area lies at the level of the head of the fibula (width being 
\ centims.). 
3. At I centim. above the level of the tip of the internal malleolus, the width of the anesthetic 
area measures 10.5 centims., the whole circumference of the limb there being 19 centims. 
\. The internal malleolus lies just about equidistant from the anterior posterior and lowest edges 
of the field on the inner aspect of the ankle. 
