582 
HEMODYNAMICS 
8. Vaishnav, R. N., Young, J. T., Janicki, J. S. and 
Patel, D. J. Non-linear anisotropic elastic proper- 
ties of the canine aorta. Submitted, Biophys. J. 12: 
1008-1027, 1972. 
DISCUSSION 
Perry L. Blackshear, University of Min- 
nesota, Minneapolis, Minn.: How much of the 
property of the wall that the blood sees when 
it goes through a blood vessel is due to the blood 
vessel property and how much is due to its 
surrounding area? 
Dr. Janicki: Are you referring to the vas- 
cular tethering? 
Dr. Blackshear : Yes. 
Dr. Janicki: Well, we could only calculate 
the contribution of tethering, and we found this 
to represent about 40 per cent of the longitu- 
dinal modulus we measured. When we removed 
it, we saw a 32 per cent decrease and this can 
be accounted for as the removal of this tethering 
tissue. 
