When a corrosive substance, or a solid object is swallowed, it is most likely to lodge and damage one of these four points. The upper striated muscle, and upper esophageal sphincter, are supplied by neurons with bodies in the nucleus ambiguuswhereas fibers that supply the smooth muscle and lower esophageal sphincter have bodies situated in the dorsal motor nucleus.
The other main type is an adenocarcinoma that occurs in the glands or columnar tissue of the esophagus. The appendix is a small tube attached to the cecum. The progress of the cancer is staged using a system that measures how far into the esophageal wall the cancer has invaded, how many lymph nodes are affected, and whether there are any metastases in different parts of the body.
Skeletal muscle is mostly found in the superior region of the esophagus to aid in the swallowing reflex while smooth muscle in the inferior esophagus pushes substances toward the stomach via peristalsis.
The esophagus lies behind the trachea and heart and in front of the spinal column ; it passes through the diaphragm before entering the stomach. Rectum The rectum Latin for "straight" is an 8-inch chamber that connects the colon to the anus.
The upper parts of the esophagus and the upper esophageal sphincter receive blood from the inferior thyroid arterythe parts of the esophagus in the thorax from the bronchial arteries and branches directly from the thoracic aortaand the lower parts of the esophagus and the lower esophageal sphincter receive blood from the left gastric artery and the left inferior phrenic artery.
The other cases occur singly.