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.
The stomach is the only organ in the digestive system to have three muscle layers. The rest of the gastrointestinal tract, or GI tract, contains only two muscle layers.The muscles together as a group, are called the muscularis externa.1  muscle layer 1: outer longitudinal layer-Below this longitudinal muscle is the Auerbach's plexus, or myenteric plexus, above the middle circular. 2  It is a layer of nerves which cause peristalsis, movement of the muscle itself. muscle layer 3 - inner oblique layer-This layer is responsible for creating the motion that churns and physically breaks down the food. 2  It is the only layer of the three which is not seen in other parts of the digestive system.