(e) The diaphragm, separating the thorax from the abdomen. It
is dome-shaped, and its margin is muscular.
(f) The cesophagus, lying underneath the trachea and extending
backwards through the thorax, under the backbone ; it passes
through the diaphragm to open into the stomach.
(ii) Abdominal Viscera.
(a) The liver, a large red solid organ attached to the diaphragm by
the suspensory ligament, a median vertical fold of peritoneum.
Its anterior surface is applied to the diaphragm and is convex ;
its posterior surface is concave and rests against the stomach.
The liver is divided into five lobes, viz. :—


(1) The left central lobe, lying against the left half of the
diaphragm.
(2) The left lateral lobe, largest in size and partially


270 THE RABBIT


subdivided, lying between the left central lobe and
the cardiac end of the stomach.
(8) The right central lobe, almost as large as the left lateral
lobe, lying against the right half of the diaphragm.
It is grooved on its posterior surface, and the gall-
bladder lies in this groove.
(4) The caudate lobe, closely applied to the pyloric end of
the stomach and to the right kidney.
(5) The Spigelian lobe, smallest in size, and situated
posteriorly to the left lateral lobe. It is closely
applied to the anterior surface of the stomach.
Note the gall-bladder lying in the groove of the right
central lobe. From its posterior end arises the cystic duct,
which passes backwards and joins the smaller hepatic
ducts from the lobes of the liver to form the bile-duct.
The common bile-duct passes beside the portal vein and
opens into the duodenum about a quarter of an inch
behind the pyloric constriction.
(b) The stomach, lying behind the liver and partly covered by it.
