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Updated: Apr 20 2019

Inguinal Canal

  • Overview
    • Inguinal rings
      • internal (deep) inguinal ring lies in transversalis fascia, just lateral to the inferior epigastric vessels
      • external (superficial) ring is a triangular opening in the external oblique aponeurosis that lies just lateral to the pubic tubercle
    • Inguinal canal
      • boundaries
        • anterior wall
          • formed by the aponeuroses of external oblique and internal oblique muscles
        • posterior wall
          • formed by the aponeurosis of transversus abdominis muscle and transversalis fascia
        • superior wall
          • roof
          • formed by the arching fibers of the internal oblique and transversus abdominis muscles
        • inferior wall
          • floor
          • formed by the inguinal ligament and lacunar ligament
      • contents
        • male
          • inguinal canal transmits spermatic cord
            • spermatic cord contents = "FANO x 3"
              • Fascia
                1. internal spermatic fascia
                2. cremasteric fascia
                  • contains cremaster muscle
                3. external spermatic fascia
              • Arteries
                1. testicular artery
                2. artery to vas deferens
                3. artery to cremaster
              • Nerves
                1. ilioinguinal nerve
                2. genital branch of genitofemoral nerve
                  • innervates cremaster muscle
                3. autonomics
              • Other
                1. vas deferens
                2. pampiniform plexus of veins
                3. testicular lymphatics
        • female
          • inguinal canal transmits
            1. round ligament of uterus
            2. ilioinguinal nerve
              1. does not pass through deep inguinal ring - only travels through part of the inguinal canal
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