LIFESCI 2 Chapter Notes - Chapter 49: Seminiferous Tubule, Sertoli Cell, Leydig Cell
Document Summary
Male reproductive organs: ureter, van deferens, urethra, epididymis, testis, scrotum. Spermatogenesis: occurs in the seminiferous tubule of the testes, contains 3 types of cells: Spermatogonia (diploid: one daughter cell remains at the outer edge of the seminiferous tubule to maintain the germ cell line, one daughter cell moves toward the lumen to produce spermatozoa. Primary spermatocyte (diploid: 2 produced by each spermatogonia. First meiotic division: each primary spermatocyte divides from diploid into haploid. Second meiotic division: each secondary spermatocyte duplicates again. Spermatids (haploid: 2 produced by each secondary spermatocyte. Spermatozoa (haploid: one spermatogonium will produce 16 spermatozoa, made of three parts: Fsh-secreting cells are stimulated: fsh is released. Lh-secreting cells are stimulated: lh is released. Sertoli cells produce inhibin which negatively inhibits the anterior pituitary to stop producing fsh. Leydig cells produce testosterone: testosterone stimulates sertoli cells stimulate spermatogenesis, testosterone negatively inhibits the hypothalamus from releasing gnrh, testosterone. Development and maintenance of secondary sexual characteristics.
