Chinook Pass, the east entrance to the park, is located three miles east of Cayuse Pass and 51 miles west of Naches on SR 410. It has an elevation of 5,430 feet. Cayuse Pass is located at the junction of SR 123 and SR 410 which is approximately 21 miles east of Greenwater on SR 410 and 16 miles north of US 12.
The mucosa, or mucous membrane layer, is the innermost tunic of the wall. It lines the lumen of the digestive tract. The mucosa consists of epithelium, an underlying loose connective tissue layer called lamina propria, and a thin layer of smooth muscle called the muscularis mucosa.In certain regions, the mucosa develops folds that increase the surface area. Certain cells in the mucosa secrete mucus, digestive enzymes, and hormones.he mucosa consists of epithelium, an underlying loose connective tissue layer called lamina propria, and a thin layer of smooth muscle called the muscularis mucosa. In certain regions, the mucosa develops folds that increase the surface area. Certain cells in the mucosa secrete mucus, digestive enzymes, and hormones.
1 The muscularis (muscularis externa) is a layer of muscle. In the mouth and pharynx, it consists of skeletal muscle that aids in swallowing. 2  The serosa is a serous membrane that covers the muscularis externa of the digestive tract in the peritoneal cavity. The following is a description of the various types of serosae associated with the digestive system: The adventitia is the serous membrane that lines the muscularis externa of the oral cavity, pharynx, esophagus, and rectum. The visceral peritoneum is the serous membrane that lines the stomach, large intestine, and small intestine.