1. Functional abdominal pain syndrome
Douglas A Drossman 
Clinical Gastroenterology and Hepatology 
Volume 2, Issue 5, Pages (May 2004)
DOI: /S (04)

2. Figure 1
A biopsychosocial understanding of FAPS. Consistent with a systems or biopsychosocial model of illness, FAPS is predisposed by early life (genetic, environmental) factors, and the patient’s symptoms and behaviors result from the interaction between psychosocial factors and gut physiology (motility and sensation), thereby leading to symptoms and adverse health outcomes.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04) )

3. Figure 2 Neuroanatomic pathways mediating visceral pain sensation.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04) )

4. Figure 3 Descending inhibitory pathway for visceral pain.
Clinical Gastroenterology and Hepatology 2004 2, DOI: ( /S (04) )