Descent of Testis
Def.: testis descends from its high position in upper lumbar region, traversing
inguinal canal to enter scrotum
Factors helping descent of testis:
• Contraction of gubernaculum.
• Testosterone & gonadotrophin hormones; stimulate contraction of
gubernaculum.
• Lengthening of dorsal body wall: results in caudal shift of testis.
• Increased intra abdominal pressure resulting from rapid growth of abdominal
viscera
• Facilitated by processus vaginalis
Process of descent of testis:
Internal descent:
– testis reaches iliac fossa: at 10th week.
– It reaches deep inguinal ring: at 12th week.
– It remains there until 7th month.
External descent:
– testis traverses inguinal canal: at 7th month,
– It reaches superficial inguinal ring: at 8th month
– It enters scrotum: at 9th month
Def.: testis descends from its high position in upper lumbar region, traversing
inguinal canal to enter scrotum
Factors helping descent of testis:
• Contraction of gubernaculum.
• Testosterone & gonadotrophin hormones; stimulate contraction of
gubernaculum.
• Lengthening of dorsal body wall: results in caudal shift of testis.
• Increased intra abdominal pressure resulting from rapid growth of abdominal
viscera
• Facilitated by processus vaginalis
Process of descent of testis:
Internal descent:
– testis reaches iliac fossa: at 10th week.
– It reaches deep inguinal ring: at 12th week.
– It remains there until 7th month.
External descent:
– testis traverses inguinal canal: at 7th month,
– It reaches superficial inguinal ring: at 8th month
– It enters scrotum: at 9th month
