anatomy - parmida

[ArchivalUser]

A pediatrician has diagnosed a newborn baby of having right-sided cryptorchidism (undescended testis). The testis may have been trapped in any site EXCEPT:

a-at the deep inguinal ring
b-just outside the superficial inguinal ring
c-pelvic brim
d-perineum
e-somewhere in the inguinal canal

[ArchivalUser]

d???????////

[ArchivalUser]

D.

[ArchivalUser]

Perineum

To understand this question, you need to understand the descent of the testes. The testes begin as retroperitoneal structures in the posterior abdominal wall. They are attached to the anterolateral abdominal wall by the gubernaculum. The gubernaculum "pulls" the testes through the deep inguinal ring, inguinal canal, superficial inguinal ring, and over the pelvic brim. The gubernaculum is preceded by the processus vaginalis, which is derived from the peritoneum anterior to the testes. The processus vaginalis "pushes" the muscle and fascia layers, which will eventually make up the canal and spermatic cord, into the scrotum. After the testes are in position in the scrotum, the gubernaculum persists as the scrotal ligament, while part of the processus vaginalis remains as a bursa-like sac called the tunica vaginalis testis. So, the testes could get caught in the deep inguinal ring, inguinal canal, at the superficial inguinal ring, or at the pelvic brim. The testes are never in the perineum, and they wouldn't get stuck there.

[ArchivalUser]

d..