The anatomy of the wall of the gastrointestinal tract is shown and the common structures that are seen throughout the tract are identified.
The small intestine is represented by the sharp spikes in the mucosa, whereas the rounded waves represent the large intestine. The gray areas represent the neuronal network of the enteric nervous system.
I The enteric nervous system is responsible for most gastrointestinal control.
II Afferent fibers provide sensory information to the CNS.
Extra info: Efferent fibers bring motor impulses to the GI which either stimulate contractions directly or indirectly.
The following receptors are present in the gastrointestinal tract:
Extra info: Both chemoreceptors (such as VIP, motilin and GIP) and mechanical receptors such as (serotonin, dopamine and acetylcholine) are present in the GI.