The femoral ring is below Poupart's ligament. When the femoral hernia
protrudes through the crural canal it is directed upward over
Poupart's ligament. To reduce it press the mass toward the feet of the
patient and then upward toward the abdominal cavity. The saphenous
opening may then be felt. On the outer side of the opening is the
large vein of the thigh. The needle should be inserted at the inner
extremity of the opening, that is toward the median line. Aspirating
of blood may mean the puncture of this large vein and it may not be
advisable to inject carelessly when this vein has been wounded owing
to its size. The crural canal is only about a half inch in length. The
injection of it may be accomplished with a hypodermic needle. It is
not well to sweep the point of the needle externally with too great
freedom as the vein may be wounded. Inject slowly and move the point
of the syringe carefully so that the injection may be diffused in the
canal.