=Venæ pulmonales. The Pulmonary Veins.=
The pulmonary veins follow in the lungs the course of the bronchi. They
enter the left auricle in three groups (Fig. 116, page 276). The first
of these (_i_) comes from the anterior and middle lobes of the right
side, the second (_h_) from the corresponding lobes of the left side,
and the third (_g_) from the terminal lobes of both sides. Each group is
composed of two or three veins and opens into a sinus or extension of
the auricle. The sinuses are from their position dextral (_i_),
sinistral (_h_), and dorsal (_g_).
=The Veins of the Body.=
The veins of the body may be classified into three main groups: (1) the
veins of the heart; (2) the superior vena cava and its branches; (3) the
inferior vena cava and its branches. The portal system of veins will be
considered with the inferior vena cava.