Which structures is found in the stomach but nowhere else in the alimentary canal?

The options are:

a. an oblique muscle layer

b. a lining of columnar epithelium

c. mucus-forming cells

d. a circular muscle layer

The correct answer is A

Explanation:

All the organs in the alimentary canal have two layers of muscles, an external longitudinal layer, and an internal circular layer. The stomach has 3 layers, a longitudinal layer, an oblique layer, and a circular layer of muscle. The layers of the stomach wall are:

The Mucosa with its epithelium, glands, connective tissue, and a muscular mucosa with two layers of smooth muscle, a circular and a longitudinal layer. The Submucosa consists of connective tissue and the Meissner's plexus. The Muscularis Externa with 3 layers of smooth muscle, a longitudinal external one, a circular, and an oblique internal layer. A serosa layer with connective tissue and mesoderm.

an oblique muscle layer

Explanation:

An oblique muscle layer can be described as one of the layer of the three layers of the smooth muscles of the stomach. And it aids digestion by grinding the food together by the digestive juices.

It should be understood also that all areas of the alimentary canal have a circular and a longitudinal layer of muscle, and that the oblique layer of muscle is found in the stomach for "wringing" itself while processing food.