PCB 2061L- Final Exam Guide - Comprehensive Notes for the exam ( 60 pages long!)
Document Summary
Mucus membrane of the stomach is composed of specialized epithelial cells for secretion or absorption. Muscular mucosa of the stomach is is the wide spread muscle fiber layer beneath the lamina propria, its contraction causes a change in the surface area for secretion/absorption. Circular layer of the stomach is contraction decreases the diameter of the lumen of the gi tract. Longitudinal layer of the stomach is contraction causes shortening of a segment of the gi tract. Serosa (adventitia) is is the external peritoneal covering layer. Efferent fibers: carry information from the brainstem and spinal cord to the gi tract. Afferent fibers: carry sensory information (chemoreceptors, mechanoreceptors) from the gi tract back to the brainstem and spinal cord. Cn x sends information to the esophagus, stomach, pancreas, intestine down to the upper parts of the large intestine. Esophageal atresia: when distal end of the esophagus is closed. Tracheoesophageal fistula: when there is a hole (connection) between esophagus and the trachea.
