The Boston medical and surgical journal . s limbs ; while the latter, onthe contrary, considers that it is due to the greater pressure of theblood in the arteries than in the veins, causing it to turn to one sideor the other according as they are placed to the right or left side ofthe umbilical vein in the umbilical ring. By Velpeaus theory, thedirection of the twist is owing entirely to chance. By that ofVan Der Kolk, while the force producing the twist is a constantone, and therefore not casual or accidental, the relative positionof the vessels with respect to each other at the ring is entir
The Boston medical and surgical journal . s limbs ; while the latter, onthe contrary, considers that it is due to the greater pressure of theblood in the arteries than in the veins, causing it to turn to one sideor the other according as they are placed to the right or left side ofthe umbilical vein in the umbilical ring. By Velpeaus theory, thedirection of the twist is owing entirely to chance. By that ofVan Der Kolk, while the force producing the twist is a constantone, and therefore not casual or accidental, the relative positionof the vessels with respect to each other at the ring is entirely amatter of chance, and therefore, chance, even under his theory,must, after ail, determine it equally as under Velpeaus theory. * On the Tause of the Spiral Dirrclion of ihe Umbilical Vessels, and the Convolutions of theCord in the Hn nan Foetus. Bv John Simpson, Esq , FKS C L , Surgeon, Royal Na-val Hospital, Ha^lar. Edm Med. Journal, July, VodV, p. 22, el seq. Vol. LXII.—No. 25 498 Spiral Direction of the Umbilical The evidence upon which Mr. Simpson relies to substantiate hisposition, is found in the marked difference between the right andleft common iliacs, both as to the angle they form with the axis ofthe aorta, and their unequal capacity. In proof of this, he citeseleven preparations in the museums of the University and theCollege of Surgeons, Edinburgh, and one made by himself, in allof which the axis of the right iliac coincided more nearly withthe axis of the aorta than that of the left, and its capacity wasmuch greater. This anatomical peculiarity cor-responds with what is found in the preparationsin the Cabinet of the Medical College in this city,and in the specimen before me, taken from a full-grown, stillborn male. (Fig. 1.) Tn this last theinequality between the two is very great, the leftiliac looking like u an insignificant branch/ andaffording but a slight antagonism to the currentflowing through the right. The fact, therefore, ofthis irr
Size: 1210px × 2066px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdec, booksubjectmedicine, booksubjectsurgery
