Human Anatomy: The Abdomen Course

Lesson 1 • Anatomical Terminology and Orientation

Covers directional terms, body planes, and axes as applied to the abdomen. Provides the language framework used throughout the entire course.

Lesson 2 • Abdominal Regions and Quadrants

Defines the nine-region and four-quadrant systems used clinically and anatomically. Students apply both systems to locate organs accurately.

Lesson 3 • Surface Anatomy and Landmarks

Identifies palpable bony and soft-tissue landmarks of the anterior and posterior abdomen. Links surface features to underlying visceral positions.

Lesson 1 • Posterior Abdominal Wall Muscles

Covers quadratus lumborum, psoas major, iliacus, and their fascial coverings. Connects these muscles to lumbar stability and retroperitoneal organ support.

Lesson 2 • Anterolateral Abdominal Muscles

Details the three flat muscles and the rectus abdominis, including fiber direction and attachments. Fiber orientation explains force vectors and functional synergy.

Lesson 3 • Innervation and Blood Supply of the Wall

Maps the thoracoabdominal nerves and epigastric vessels supplying the abdominal wall. Provides the basis for understanding nerve block techniques and incision planning.

Lesson 4 • Rectus Sheath and Linea Alba

Analyzes the aponeurotic sheath enclosing the rectus abdominis above and below the arcuate line. Explains how sheath composition changes affect surgical approach.

Lesson 1 • Peritoneal Layers and Reflections

Distinguishes parietal from visceral peritoneum and describes how reflections form mesenteries and ligaments. Lays the structural basis for understanding organ mobility.

Lesson 2 • Peritoneal Fluid Dynamics and Pathology

Explains normal peritoneal fluid production, absorption, and pathological accumulation. Connects anatomy to clinical presentations such as ascites and peritonitis.

Lesson 3 • Peritoneal Compartments and Recesses

Identifies the greater and lesser sacs, subphrenic spaces, and paracolic gutters. Explains how compartment anatomy directs abscess formation and fluid spread.

Lesson 1 • Jejunum and Ileum

Compares gross and microscopic features distinguishing jejunum from ileum. Covers mesenteric root, vascular arcades, and ileocecal junction anatomy.

Lesson 2 • Blood Supply of the GI Tract

Maps celiac trunk, superior mesenteric artery, and inferior mesenteric artery territories. Identifies watershed zones critical for ischemia risk assessment.

Lesson 3 • Duodenum: Segments and Relations

Details the four duodenal parts, their peritoneal status, and key neighboring structures. Explains why the duodenum is vulnerable in pancreatic and biliary pathology.

Lesson 4 • Large Intestine: Cecum to Sigmoid

Describes the cecum, appendix, colon segments, and sigmoid colon with their peritoneal relations. Highlights anatomical features used in colonoscopy and surgical resection.

Lesson 1 • Gallbladder and Biliary Tree

Covers gallbladder anatomy, Calot's triangle, and the extrahepatic biliary ductal system. Calot's triangle dissection is the key step in safe cholecystectomy.

Lesson 2 • Liver: Gross Anatomy and Lobes

Describes liver surfaces, lobes, and peritoneal ligaments anchoring it to the diaphragm and anterior wall. Establishes spatial context for hepatic surgery and imaging.

Lesson 3 • Couinaud Hepatic Segmentation

Applies the Couinaud system to divide the liver into eight functional segments based on portal and hepatic venous supply. Enables precise surgical resection planning.

Lesson 4 • Hepatic and Portal Vasculature

Traces the dual blood supply of the liver and the portal venous system collecting from the gut. Identifies portosystemic anastomoses relevant to portal hypertension.

Lesson 1 • Kidney: Gross and Internal Anatomy

Covers renal surfaces, poles, hilum contents, and internal corticomedullary organization. Provides the structural basis for understanding renal function and pathology.

Lesson 2 • Retroperitoneal Vessels and Lymphatics

Maps the abdominal aorta, inferior vena cava, and para-aortic lymph node chains in the retroperitoneum. Provides the vascular framework for retroperitoneal surgery and oncologic staging.

Lesson 3 • Retroperitoneal Fascial Compartments

Defines Gerota's fascia, perirenal fat, and pararenal fat compartments enclosing retroperitoneal organs. Compartment boundaries determine spread of hemorrhage and infection.

Lesson 4 • Ureter: Course and Relations

Traces the ureter from renal pelvis to bladder, noting three sites of physiological narrowing. Narrowing sites predict stone impaction and guide ureteroscopic access.

Lesson 1 • Inferior Vena Cava and Tributaries

Traces IVC formation, course, and tributaries from iliac confluence to caval hiatus. Identifies segments vulnerable to compression by retroperitoneal masses.

Lesson 2 • Portal Venous System

Details portal vein formation, intrahepatic distribution, and portosystemic collateral pathways. Collateral anatomy explains variceal bleeding sites in portal hypertension.

Lesson 3 • Lymphatic Drainage of Abdominal Organs

Maps lymph node groups draining each organ to regional and para-aortic nodes. Lymphatic routes determine metastatic spread patterns and surgical node dissection extent.

Lesson 4 • Autonomic Innervation of the Abdomen

Describes sympathetic splanchnic nerves, parasympathetic vagal supply, and the celiac and mesenteric plexuses. Plexus anatomy is the basis for nerve block and pain management procedures.

Lesson 1 • Other Abdominal Wall Hernias

Covers umbilical, paraumbilical, epigastric, Spigelian, and lumbar hernias with their anatomical defect sites. Each hernia type reflects a specific weakness in the abdominal wall architecture.

Lesson 2 • Inguinal and Femoral Hernia Anatomy

Differentiates indirect, direct, and femoral hernias by their anatomical pathways relative to the inferior epigastric vessels. Anatomical distinctions guide repair technique selection.

Lesson 3 • Diaphragm: Anatomy and Apertures

Describes diaphragmatic muscle origins, central tendon, and the three major apertures with their transmitted structures. Aperture anatomy explains hiatal hernia types and caval compression.

Lesson 4 • Inguinal Canal: Walls and Contents

Defines the four walls, two rings, and contents of the inguinal canal in both sexes. Precise wall knowledge is essential for hernia repair and nerve preservation.