Male gametes

10 important questions on Male gametes

What are Seminiferous tubules?

basal membrane + seminiferous epithelium

What is the foetal phase?

germ cells divide several times before they become gonocytes

What happens in the prepubertal phase?

Gonocytes develop into A1 spermatogonia
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What are A and B spermatogonia and what forms do they have and what is the right order?

A1 -> A2 -> A3 -> A4 -> B spermatogonia
  • Single spermatogonia are called type A and spermatogonia clusters of more than 4 cells are called type B
  • Type B divide once or twice and then become the primary spermatocytes, that are still diploid
    • These cells duplicate their DNA -> undergo meiosis 1 -> secondary spermatocytes -> meiosis 2 -> haploid spermatids

What is the function of LH in relation to spermatogenesis?

LH stimulates Leydig cells to pulsatile release of androgens -> androgens diffuse to the Sertoli cells  -> to the blood -> negative feedback on the hypothalamus and pituitary

What is the function of FSH in relation to spermatogenesis?

FSH stimulates Sertoli cells to produce inhibin and ABP -> ABP forms a complex with the androgens from the leydig cells -> released to the lumen of the seminiferous tubules with the sperm cells -> causes high androgen content of testes secretions
  • Androgen binding protein
  • Inhibin has a negative feedback on FSH production

What is the function of the epidymis?

transports the sperm cells into the vas deferens

What happens with sperm cells during transport to the epidymis?

Sperm cells undergo a maturation process, and are not able to fertilize ova

What triggers ejaculation and what is the content?

pressure and temperature, sperm cells and seminal plasma

What is the function of seminal plasma?

  • Transport of sperm cells from the male to the female reproductive tract
  • Isotonic and neutral

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