What referred pain is the black arrow pointing to?

Master Differential Diagnosis and Medical Screening in Physical Therapy. Engage with flashcards and multiple choice questions, all with detailed explanations. Prepare thoroughly for your exam today!

Visceral referred pain comes from the way visceral and somatic nerves share spinal cord pathways. When an organ in the abdomen becomes irritated, the brain often interprets that pain in a skin or muscle area supplied by the same spinal segments. Embryologic origin helps predict the pattern: foregut structures (like the stomach) tend to refer to the upper abdomen (epigastric), midgut structures (including the small intestine and proximal colon) to the periumbilical region, and hindgut structures (descending and sigmoid colon, rectum) to the lower abdomen and pelvic area, especially the left lower quadrant for the sigmoid colon.

If the arrow points to the left lower quadrant, that localization is most consistent with the sigmoid colon. The other organs have different typical referral zones: the small intestine usually maps to the periumbilical area; the cecum/ascending colon more often to the right or periumbilical region; the stomach to the epigastric region (and, in diaphragmatic irritation, may refer to the shoulder). In clinical practice, this pattern helps distinguish which abdominal segment might be involved, though imaging and exam findings are still needed for a definitive diagnosis.