Abdominal regional anatomy part 1 -Topography 24-25

LSBU Abdominal Regional Anatomy

PART 1: TOPOGRAPHY

Instructor: Djamila Hamdaoui

Learning Objectives

  • Identify the abdominal quadrants and regions: Understand the four quadrant and nine region schemes related to the abdomen.

  • Understand the derivation of schemes: Discuss how each scheme is derived, including the contributing lines and planes.

  • Recognize critical structures: Identify the principal structures within the quadrants and nine region scheme.

  • Clinical application: Describe the utility of these schemes in clinical settings and in referrals for imaging investigations.

Abdominal Quadrant and Region Systems

  • Both the four quadrant and nine region systems are widely recognized frameworks used in clinical practice.

  • Purpose: These systems allow for a clear description of pain and symptoms relevant to specific regions of the abdomen, facilitating diagnosis and treatment.

  • Location of Abdominal Organs: These schemes help in mapping the anatomical organization of abdominal organs via a systematic approach to the anatomical divisions of the abdomen.

Nine Region Scheme

  • This scheme includes two horizontal and two vertical planes that help define the abdominal regions.

    • Vertical Planes:

      • Subcostal Plane: This is located at the level of the lower border of the 10th costal cartilage and intersects with the body of the L3 vertebra.

      • Intertubercular Plane: This line joins the tubercles of each iliac crest, approximately at the level of the L5 vertebra.

Abdominopelvic Regions

  • The nine regions of the abdomen are delineated by these planes, which helps in further understanding and locating abdominal organs:

    • Right Upper Quadrant (RUQ)

    • Left Upper Quadrant (LUQ)

    • Right Lower Quadrant (RLQ)

    • Left Lower Quadrant (LLQ)

    • Regions:

      • Epigastric Region: Located above the umbilicus, between the hypochondriac regions.

      • Hypochondriac Regions: Right and left sides of the upper abdomen, where organs such as the liver and spleen are located.

      • Umbilical Region: Central area around the navel.

      • Lumbar Regions: Left and right, corresponding to the sides of the lower back.

      • Iliac Regions: Left and right, also known as inguinal regions, located beside the pubic area.

      • Hypogastric Region: Located below the umbilical region.

Anatomical Landmarks

  • Diaphragm: The muscle that divides the thoracic and abdominal cavities, influencing respiration and intra-abdominal pressure.

  • Vertebral Levels and Structures: An understanding of vertebral levels helps one grasp the relationships among various organs:

    • Atlas (C1) through to the Lumbar Vertebrae (L5)

    • Sacrum (S1-S5) and Coccyx.

  • Key Reference Points:

    • T1 - T12 for the thoracic vertebrae: locate structures such as the spleen, liver, pancreas, and stomach.

Conclusion

  • The abdominal regional anatomy is crucial for clinicians to communicate effectively about patient conditions, providing a detailed understanding of anatomy tied to specific symptoms and regions.