s very
variable as to its length, but it is stated to be usually two inches.
The artery, I, continuing to diverge in its first direction from its
fellow of the opposite side, descends along the margin of the true
pelvis as far as Poupart's ligament, D, where it gives off its next
principal branches,--viz., the epigastric and circumflex iliac. At the
interval between the internal iliac and epigastric branches, the main
artery, I, is named external iliac; and the surgical length of this part
is also liable to vary, in consequence of the epigastric or circumflex
iliac branches arising higher up or lower down than usual. The main
vessel, after passing beneath the middle of Poupart's ligament, D, next
gives off the profundus branch, N, to supply the thigh. This branch
generally arises at a point an inch and half or two inches below the
fold of the groin; and between it and the epigastric above, the main
artery is named common femoral. From the point where the profundus
branch arises, down to the popliteal space, the vessel remains as an
undivided trunk, being destined to supply the leg and foot. In this
course, the artery is accompanied by the vein, H K O, which, according
to the region in which it lies, assumes different names, corresponding
to those applied to the artery. Both vessels may now be viewed in
relation to each other, and to the several structures which lie in
connexion with them.

The two vessels above Poupart's ligament lie behind the intestines, and
are closely invested by the serous membrane. The origin of the vena
cava, F, lies close to the right side of the bifurcation of the aorta,
A; and here both vessels are supported by the lumbar spine. Each of the
two arteries, G G,* into which the aorta divides, has its accompanying
vein, H, on its inner side, but the common iliac part of the right
artery is seen to lie upon the upper portions of both the veins, as
these joining beneath it form the commencement of the vena cava. The
external iliac part, I, of each artery has its vein, K, on its inner
side. At the point, G, where the artery gives off its internal iliac
branch, the ureter, g, crosses it, and thence descends to the bladder.
The internal iliac branch subdivides in general so soon after its
origin, that it may be regarded as for the most part an unsafe
proceeding to place a ligature upon it.

The iliac vessels, A G I, in approaching Poupart's ligament along the
border of the true pelvis, are supported