3. Left subclavian, formed in the same manner as the right.
The external jugular vein returns the blood from the outside of the head, and runs along the neck, just under the skin.
We sometimes bleed from this in affec tions of the head.
The internal jugular is a very large ves sel, lying deeper in the neck, andclosc to the carotid artery. It brings back the blood from the brain. The danger in at tempts at suicide consists in dividing this vessel or the carotid artera and not the exteleal jugular vein. The axillary vein is made up of the vessels which bring the blood back from the fur. Besides the deep-teated veins, we have here a large superficial vessel, running along the out side of thIE fore-arm and arm, and called the cephalic vein ; another on the inside, named the basilic. Between these in the fore-arm are found some veins called the median. At the bend of the elbow these last make up two large trunks, of which one opens into the basilic, and the other into the cephalic vein. These are galled vena mediana basilica, and vena mediana cephalica. It is the latter veins that we generally bleed, when that operation is performed in the arm ; and as they run directly over the artery, the lattct vessel is endangered by the lancet'.
The inferior vena Cava is a very large trunk, ruimingalong the spine at the right side of the Rolla. It returns the blood
from all the lower parts of the body. It is made up by the junction of the two common iliac veins ; and as it ascends through the abdomen, it receives the fol lowing venous trunks; the lumbar, sper matic, renal, and the immense verse caves he paticx.
The common iliac vein is formed by the junction oft he external and internal iliacs. The latter brings back the blood from the cavity of the pelvis ; the former returns it from the lower extremity.
We have two large cutaneous veins to notice in the leg• and thigh ; viz. the sa phena major, which runs up along the in ner side both of the leg and thigh, and can be distinctly seen in the living person when in the erect posture ; the saphena minor, which runs over the calf of the leg. The former terminates in the femoral vein near the abdomen, the latter in the popliteal vein.
The vena portal-um is a large vessel, formed by the union of those veins which belong to the stomach and intestines, the spleen and pancreas. It conveys t he blood, which has circulated through those organs to the liver, and it branchc s out in that gland as arteries do, in other parts. Its blood is returned from the liver by the hepatic veins, which have been already noticed.