Male external genitalia

  
Scrotum    
  • A cutaneous outpouching of the skin of the abdomen
  • contains the testis


         
The skin  

  • Thin, dark colored, and rugose
  • The scrotal raphe indicates the bilateral origin of the scrotum (from the labioscrotal swellings)

Superficial fascia                  

  • Devoid of fat
    •          
  • Contains smooth muscle called dartos muscle, which helps regulate temperature
  • It is   continuous anteriorly with the membranous layer of superficial fascia of the anterior abdominal wall
Coverings of the testis

Coverings of the testis are continuous with the coverings of the spermatic cord

  • The external spermatic fascia – external oblique aponeurosis

  • Cremaster muscle and cremasteric fascia – internal oblique aponeurosis

  • Internal spermatic fascia – transversalis fascia

  • Tunica vaginalis – peritoneum (processus vaginalis), visceral and parietal.
    Blood supply of the scrotum:
  
    • Scrotal branch of the internal pudendal artery

    • External pudendal branches of the femoral artery

    • Cremasteric branch of the inferior epigastric artery
Nerve supply of the scrotum  
    • Genital branch of the genitofemoral nerve; sensory to the anterior and lateral surfaces of the scrotum.
    • Ilioinguinal nerve; sensory to the anterior surface
    • Perineal branch of the pudendal nerve – posterior surface
    • Perineal branch of the posterior femoral cutaneous – inferior surface
    Lymphatics of the scrotum
  1. Superficial inguinal lymph nodes
  2. Deep external iliac or the lumbar nodes
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