Cannabaceae

thcscience_admin
Seminiferous tubule
Seminiferous tubule in cross-section (large tubular structure – center of image) with sperm (black, tiny, ovoid bodies furthest from the outer edge of the tubular structure). H&E stain.
1: Testicular septa
2: Convoluted seminiferous tubules
3: Testicular lobules
4: Straight seminiferous tubules
5: Efferent ductules
6: Rete testis
Details
Identifiers
Latintubuli seminiferi
MeSHD012671
TA98A09.3.01.022
TA23599
FMA19825
Anatomical terminology

Seminiferous tubules are located within the testicles, and are the specific location of meiosis, and the subsequent creation of male gametes, namely spermatozoa.

Structure[edit]

The epithelium of the tubule consists of a type of sustentacular cells known as Sertoli cells, which are tall, columnar type cells that line the tubule.

In between the Sertoli cells are spermatogenic cells, which differentiate through meiosis to sperm cells. Sertoli cells function to nourish the developing sperm cells. They secrete androgen-binding protein, a binding protein which increases the concentration of testosterone.

There are two types: convoluted and straight, convoluted toward the lateral side, and straight as the tubule comes medially to form ducts that will exit the testis.

The seminiferous tubules are formed from the testis cords that develop from the primitive gonadal cords, formed from the gonadal ridge.

Function[edit]

Main article: Spermatogenesis

Spermatogenesis, the process for producing spermatozoa, takes place in the seminiferous tubules. During spermatogenesis, the DNA of spermatogenic cells in the seminiferous tubules is subject to damage from such sources as reactive oxygen species.[1] The genomic integrity of spermatogenic cells is protected by DNA repair processes.[2] Deficiencies in the enzymes employed in these repair processes may lead to infertility.[2]

Additional images[edit]

  • Seminiferous tubule (right) with sperm (black, tiny, ovoid). H&E stain.
    Seminiferous tubule (right) with sperm (black, tiny, ovoid). H&E stain.
  • Longitudinal section through the left side of the scrotum and the left testis (seminiferous tubules visible in center, but not labeled).
    Longitudinal section through the left side of the scrotum and the left testis (seminiferous tubules visible in center, but not labeled).
  • Seminiferous tubule (transverse section).
    Seminiferous tubule (transverse section).
  • Photomicrograph of section through rat testis, showing seminiferous tubules.
    Photomicrograph of section through rat testis, showing seminiferous tubules.

See also[edit]

References[edit]

  1. ^ Mahfouz R, Sharma R, Thiyagarajan A, Kale V, Gupta S, Sabanegh E, Agarwal A (2010). "Semen characteristics and sperm DNA fragmentation in infertile men with low and high levels of seminal reactive oxygen species". Fertil. Steril. 94 (6): 2141–6. doi:10.1016/j.fertnstert.2009.12.030. PMID 20117780.
  2. ^ a b Gunes S, Al-Sadaan M, Agarwal A (2015). "Spermatogenesis, DNA damage and DNA repair mechanisms in male infertility". Reprod. Biomed. Online. 31 (3): 309–19. doi:10.1016/j.rbmo.2015.06.010. PMID 26206278.

External links[edit]

source: https://en.wikipedia.org/wiki/Seminiferous_tubule

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

Leave a Reply