Sex cord
Encyclopedia
In animal
embryology
, the gonadal cords or sex cords (or primitive sex cords) are structures that develop from the gonadal ridge
. After sexual differentiation, in male
s the sex cords become the testis cords
, which help develop and nourish the Sertoli cell
s, while in female
s they become the cortical cords
.
Animal
Animals are a major group of multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and...
embryology
Embryology
Embryology is a science which is about the development of an embryo from the fertilization of the ovum to the fetus stage...
, the gonadal cords or sex cords (or primitive sex cords) are structures that develop from the gonadal ridge
Gonadal ridge
In embryology, the gonadal ridge is the precursor to the gonads. The gonadal ridge initially consists mainly of mesenchyme and cells of underlying mesonephric origin. Once oogonia enter this area they attempt to associate with these somatic cells...
. After sexual differentiation, in male
Male
Male refers to the biological sex of an organism, or part of an organism, which produces small mobile gametes, called spermatozoa. Each spermatozoon can fuse with a larger female gamete or ovum, in the process of fertilization...
s the sex cords become the testis cords
Testis cords
The testis cords are precursors to the rete testis. They play several different roles in the development of the male genitals....
, which help develop and nourish the Sertoli cell
Sertoli cell
A Sertoli cell is a 'nurse' cell of the testes that is part of a seminiferous tubule.It is activated by follicle-stimulating hormone and has FSH-receptor on its membranes.-Functions:...
s, while in female
Female
Female is the sex of an organism, or a part of an organism, which produces non-mobile ova .- Defining characteristics :The ova are defined as the larger gametes in a heterogamous reproduction system, while the smaller, usually motile gamete, the spermatozoon, is produced by the male...
s they become the cortical cords
Cortical cords
In embryology, cortical cords are structures that develop from sex cords in the female. After further development they become the ovarian follicles.In the male, they become seminiferous tubules....
.
External links
See also
- Sex cord-stromal tumourSex cord-stromal tumourSex cord-gonadal stromal tumour is a group of tumours of sex cord-derived tissues of the ovary and testis. In humans, this group accounts for 8% of ovarian cancers and under 5% of testicular cancers. Their diagnosis is histological: only a biopsy of the tumour can make an exact diagnosis...