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The female reproductive system is composed of two embryological segments: the urogenital sinus and the paramesonephric ducts. The two are conjoined at the sinus tubercle. [2] [3] Paramesonephric ducts are present on the embryo of both sexes. [3] [4] Only in females do they develop into reproductive organs.
The internal genitalia consist of two accessory ducts: mesonephric ducts (male) and paramesonephric ducts (female). The mesonephric system is the precursor to the male genitalia and the paramesonephric to the female reproductive system. [8] As development proceeds, one of the pairs of ducts develops while the other regresses.
In the male, remnants of the paramesonephric duct may be present as well and are also known as appendix of testis or hydatid of Morgagni. They are rarely absent, and are attached either to the free margin of the mesosalpinx or to one of the fimbriae, and are pedunculated vesicles, filled with fluid, about the size of a small pea.
* 3. Ureter * 4. Urinary bladder * 5. Urachus * cl. Cloaca * cp. Elevation which becomes clitoris or penis * i. Lower part of the intestine * ls. Fold of integument from which the labia majora or scrotum are formed * m, m. Right and left paramesonephric ducts uniting together and running with the mesonephric ducts in gc, the common genital cord ...
This page was last edited on 21 May 2011, at 20:10 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply ...
m, m. Right and left Müllerian ducts uniting together and running with the Wolffian ducts in gc, the genital cord: m. Müllerian duct, the upper part of which remains as the hydatid of Morgagni; the lower part, represented by a dotted line descending to the prostatic utricle, constitutes the occasionally existing cornu and tube of the uterus ...
[1]: 185 The sperm differentiate inside the seminiferous tubules, then swim down these tubes, then through these special mesonephric tubules, and go down inside Wolffian duct, to the coelom and finally to the organ the animal uses to transport sperm into females. In females, the structure gives rise to the paroöphoron. [1]: 177
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.