1 / 28

Male Anatomy Embryogenesis

Male Anatomy Embryogenesis. Chapters 3 & 4. Seminiferous Tubules. Components Epithelium Sertoli cells developing germ cells peritubular cells. Figure 3-12. Sertoli Cells. Produce variety of substances Androgen binding protein sulfated glycoprotein 1 & 2 transferrin inhibit

jana-bennett
Download Presentation

Male Anatomy Embryogenesis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Male AnatomyEmbryogenesis Chapters 3 & 4

  2. Seminiferous Tubules • Components • Epithelium • Sertoli cells • developing germ cells • peritubular cells

  3. Figure 3-12

  4. Sertoli Cells • Produce variety of substances • Androgen binding protein • sulfated glycoprotein 1 & 2 • transferrin • inhibit • Have tight junctions • Form blood-testis barrier with peritubular cells around ST

  5. Excurrent Ducts • Efferents • Epididymal duct • ductus deferens • Extragonadal reserves of sperm

  6. Figure 3-14

  7. Cytoplasmic Droplet • Proximal • Translocating • Distal • High proportion of ejeaculated spermatozoa with a droplet indicates faulty epididymal maturation

  8. Seminal Plasma • Fluids from epididymis & accessory sex glands • Not required for fertility, but important in natural insemination

  9. Accessory Sex glands • Ampulla • Seminal vesicles (vesicular glands) • prostate gland • bulbourethral glands (Cowper’s glands) • What’s the difference between species in Fig 3-15?

  10. Penis • Consists of: • base • shaft • glans penis • Fibroelastic penis • Stiffening without a change in diameter • Cavernosum penis • Blood collects & increases in diameter with stiffening

  11. Figure 3-16

  12. Review from last lecture • Comparative evaluation of accessory sex glands

  13. Differentation of Tissue • Endoderm • Gut • Lungs • Liver

  14. Differentation of Tissue • Mesoderm • Muscle • Skeleton • Cardiovascular • Reproductive

  15. Differentation of Tissue • Ectoderm • Nervous system • Skin • Hair • Know Table 4-1

  16. Figure 4-1

  17. Pituitary Gland • Both neural & epithelial in origin • Rathke’s pouch • Fig 4-2 (know development) • Hypophysis = pituitary • Adneohypophysis = Anterior pit. • Neurohypophysis = Posterior pit.

  18. Fig 4-3

  19. Sexual Differentiation • Starts with XY chromosomes • Primordial germ cells migrate from yolk sac to genital ridge • Primordial gonad undifferentiated • Primordial germ cells undergo mitosis & increase in number. • Primordial germ cells that don’t make it to gonad die

  20. Sexual Differentiation • Primordial renal system • Pronephros • Mesonephros (ducts called Wolffian ducts) • Metanephros (final system) - last 2/3rds of gestation

  21. Sexual Differentiation • Testis Determining Factor • Anti-Mullerian Hormone • Figure 4-5

  22. Figure 4-5

  23. Sexual Differentiation • Descent of the testis - 3 Phases • Testis starts by ribs • Growth & elongation of the body away from the testes • Rapid growth of the distal gubernaculum • Regression of gubernaculum

  24. Sexual Differentiation • Growth of gubernaculum controlled by testes factor • Low molecular weight • “descendin” • Control of gubernaculum contraction unknown • Cryptochidism • Inguinal hernia

  25. Fig 4-7

  26. Sexual Differentiation • Females have X chromosome that lacks TDF gene • No development of Sertoli cells, so no AMH • Oviducts, uterus, cervix & anterior vagina develop from paramesonephric ducts • Female tract located outside peritoneum

  27. Figure 4-5

  28. Sexual Differentiation • Freemartin • Common blood supply between fetal bull & heifer • AMH is transferred to female

More Related