University:
Stanford University
Course:
MED 101 | Human Anatomy
Academic year:

2023
Views:

356

Pages:

1
Author:

larbi43100

The urogenital sinus and the annexed glands The urethral and paraurethral glands are formed in the 4th months of development, from sprouts from the wall of the urethra which invaginate into the underlying mesenchyme, their excretory ducts will later open into the lumen of the urethra. The lowest located glandular clusters open directly into the vestibule (Canals of Skène). The vulvovaginal glands or Bartholin glands are develop from the wall of the utero-vaginal canal and are well individualized from the 3rd month of development. They have an excretory canal which, due to the lowering of the lower part of the uterovaginal canal, will subsequently open into the vestibule, in contact with the hymen. They will develop from puberty. 1) External genitalia In the female sex, there are few transformations of the undifferentiated organs: ✪The genital tubercle keeps its shape and folds downward to give the clitoris. ✪The genital folds become the labia minora which circumscribe the opening of the vestibule. ✪The labio-scrotal ridges remain separated and become the big lips. 2) Malformations They result from anomalies in different stages of development and can occur in all the constituents of the urogenital system: ✪The absence of fusion of the Müller channels gives, according to the level, a bicornuate or bi-cervical uterus and, at most di-delphi with splitting of the vagina, ✪The absence of resorption of the median septum results in the formation of a bi-locular uterus, ✪Atresia of the utero-vaginal canal results, depending on the level of narrowing, uterine atresia or cervical atresia, ✪The lack of development of the sinovaginal bulbs results in, depending on its degree, to the absence of the vagina or to its atresia, The absence of dehiscence of the hymen leads to the retention of secretions from the genital tract (hydrocolpos).