The abdominal wall and inguinal region

ABDOMEN

Abdominal Wall and Inguinal Canal

  • Subject: Human Anatomy (Course: ANTH/EEB/NURS 250, Lecture 6.1)

Skeleton and Bony Landmarks

  • Os Coxa
  • Iliac Crest
  • Anterior Superior Iliac Spine
  • Pubis
  • Inguinal Ligament
  • Lumbar Vertebrae
  • Inferior Ribs

Viscera Location in the Abdomen

  • Liver
  • Stomach
  • Duodenum
  • Ascending Colon
  • Cecum with Vermiform Appendix
  • Rectum
  • Spleen
  • Pancreas
  • Transverse Colon
  • Descending Colon
  • Jejunum and Ileum
  • Sigmoid Colon

Location of Glands and Kidneys in the Abdomen

  • Left Suprarenal Gland
  • Left Kidney
  • Right Suprarenal Gland
  • Right Kidney

Wall Divisions of the Abdomen

Quadrants
  • Umbilicus as a central reference point
Regions
  • Midclavicular Line
  • Right Hypochondrium (under the costal margin)
  • Umilicus
  • Iliac Crest
  • Hypogastric Region

Superficial Wall & Fascia

  • Overview: The abdominal wall consists of distinct layers.

Wall Muscles

  • Overview: The primary musculature of the abdominal wall includes:
    • Sternum
    • External Abdominal Oblique Muscle:
      • Located laterally to the abdomen.
      • It has an aponeurosis forming the anterior rectus sheath.
      • Significance: Contributes to abdominal wall strength.
    • Rectus Abdominis Muscle:
      • Runs vertically along the anterior abdomen.
    • Internal Abdominal Oblique Muscle:
      • Positioned beneath the external oblique muscle.
    • Transversus Abdominis Muscle:
      • The deepest muscle layer.

Arcuate Line

  • A critical landmark within the abdominal wall musculation separating certain aspects of the muscular structure.

Cross-Sections of the Abdomen

  • Visual presentations of the abdominal wall:
    • Superior to the Arcuate Line
      • Includes Rectus Abdominis Muscle, Abdominal Cavity, Line Alba, External Oblique, Internal Oblique, Transversus Abdominis, and Parietal Peritoneum.
    • Inferior to the Arcuate Line
      • Includes similar structures as above noted above.

Superficial Vessels

  • Internal Thoracic Artery & Vein
  • Epigastric Artery & Vein: Deep to the Rectus Abdominis Muscle.

Inguinal Canal

  • Inguinal Ligament important in supporting and forming the canal.
Spermatic Cord Present

  • Superficial Inguinal Ring

    • An opening in the external oblique muscle.
    • Functions as part of the passage for the spermatic cord.

  • Internal Oblique (with Cremaster Muscle) leads to the Superficial Ring.

  • Deep Ring of the inguinal canal is associated with the Transversus Abdominis.

Inguinal Canal with Round Ligament of Uterus Present
  • Features:
    • Superficial Inguinal Ring, significant for the anatomy of the female reproductive system.
    • Connection to peritoneal structures.
Components of the Scrotum and Spermatic Cord
  • Layers of the Scrotum and Testicular Covering:
    • Skin
    • Subcutaneous Tissue (Dartos Muscle & Fascia)
    • External Spermatic Fascia
    • Cremaster Muscle & Cremasteric Fascia
    • Internal Spermatic Fascia
    • Transversalis Fascia
    • Parietal Peritoneum
    • Tunica Vaginalis (with parietal and visceral layers)

Hernias

  • Components of Hernias:
    • Skin
    • Subcutaneous Tissue
    • Hernial Sac and contents
    • Transversalis Fascia
    • Hernial Ring
    • Parietal Peritoneum
Types of Inguinal Hernias
  • Indirect Hernia: Passes lateral to epigastric vessels and traverses the full length of the inguinal canal.
  • Direct Hernia: Occurs medial to the epigastric vessels and traverses the abdominal wall and part of the inguinal canal.