third, the mucous membrane, or internal coat, which is continuous with
the mucous lining of the pharynx.

[Illustration: Fig. 28.
A representation of the interior of the stomach.
_1_. The esophagus. _2_. Cardiac orifice opening into
the stomach. _6_. The middle or muscular coat.
_7_. The interior or mucous coat. _10_. The beginning
of the duodenum. _11_. The pyloric orifice.]

The _Stomach_ is a musculo-membranous, conoidal sac, communicating with
the esophagus by means of the cardiac orifice (see Fig. 28). It is
situated obliquely with reference to the body, its base lying at the
left side, while the apex is directed toward the right side. The stomach
is between the liver and spleen, subjacent to the diaphragm, and
communicates with the intestinal canal by the pyloric orifice. It has
three coats. The peritoneal, or external coat is composed of compact,
cellular tissue, woven into a thin, serous membrane, and assists in
keeping the stomach in place. The middle coat is formed of three layers
of muscular fibers: in the first, the fibres run longitudinally; in the
second, in a circular direction; and in the third, they are placed
obliquely to the others. The interior, or mucous coat, lines this organ.
The stomach has a soft, spongy appearance, and, when not distended, lies
in folds. During life, it is ordinarily of a pinkish color. It is
provided with numerous small glands, which secrete the gastric fluid
necessary for the digestion of food. The lining membrane, when divested
of mucus, has a wrinkled appearance. The arteries, veins, and
lymphatics, of the stomach are numerous.

[Illustration: Fig. 29.