Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
"In operative procedures the surgeon tries to find a convenient and favourable way to reach the organ to be treated. Especially in the extremities he has to use planes of cleavage chosen in such a way, that the tissues are left intact as a unit as much as possible. Only here and there on this way - which is sometimes called the physiological approach - impediments are to be found, mainly formed by neuro-vascular bundles running between the muscles and entering them.
Blevins, William E.
"Bone Vascularization and Its Effect on Fracture Healing,"
Iowa State University Veterinarian: Vol. 30
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol30/iss3/2