LS 2 Lecture 9

LS 2 Lecture 9 - Life Sciences 2 Chapter 43 & 44 Animal...

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1 Life Sciences 2 Development Dr. Joseph Esdin Sexual Reproduction • Gametogenesis • Mating • Fertilization
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2 Male Reproductive Organs Vas deferens Ureter Epididymis Testis Scrotum Urethra Spermatogenesis • Occurs in the seminiferous tubule of the testes • Contains 3 types of cells: • Spermatozoa • Sertoli cells (blood testis barrier) • Leydig cells (testosterone)
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3 Seminiferous Tubules Seminiferous tubules Rete testis Efferent ductules Epididymis Vas deferens Stages Mitotic proliferation Meiosis Packaging Spermatids Secondary spermatocyte Primary spermatocyte Spermatogonium Spermatozoa First meiotic division Second meiotic division 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 Chromosomes in each cell 46 (diploid number) 46 (diploid number) 46 (diploid number) 23 (haploid number) 23 (haploid number) 23 (haploid number) Spermatogonia Spermatogenesis
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4 Spermatozoa Head Midpiece Tail Acrosome Cell Mitochondria Nucleus Spermatozoa • Made of 3 parts: Head, midpiece, and tail • Head – Nucleus – Acrosome • Contain enzymes for fertilization • Midpiece – Contains lots of mitochondria • Tail – Contractile filaments
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Hypothalamus Gonadotropin-releasing hormone Anterior pituitary FSH-secreting cells LH-secreting cells FSH LH Testes Sertoli cell Leydig cell Spermatogenesis Inhibin Testosterone Hormonal Control Testosterone • Development and maintenance of secondary sexual characteristics – Deepening of the voice
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LS 2 Lecture 9 - Life Sciences 2 Chapter 43 & 44 Animal...

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